Common Stock and Options - Narrative (Details) - USD ($)
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12 Months Ended |
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Sep. 06, 2022 |
May 31, 2022 |
May 18, 2022 |
Apr. 01, 2022 |
Jan. 26, 2022 |
Nov. 05, 2021 |
Oct. 15, 2021 |
Nov. 10, 2020 |
Oct. 11, 2019 |
Feb. 11, 2019 |
Oct. 25, 2018 |
Sep. 07, 2018 |
Dec. 31, 2016 |
Sep. 30, 2022 |
Sep. 30, 2021 |
Sep. 30, 2020 |
Feb. 27, 2015 |
Class Of Stock [Line Items] |
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Total stock-based compensation expense |
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$ 1,235,000
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$ 1,230,000
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$ 1,306,000
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Employee stock options granted (in shares) |
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0
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0
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118,000
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Period of consecutive trading days |
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20 days
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Common shares available |
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126,500
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218,000
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293,000
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Restricted Stock |
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Class Of Stock [Line Items] |
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Total stock-based compensation expense |
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$ 459,000
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$ 144,000
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$ 69,000
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Number of restricted shares awarded |
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30,227
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5,885
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Weighted average fair value (in dollars per share) |
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$ 37.82
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$ 31.20
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Number of restricted shares vested |
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6,740
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0
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5,666
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Number of restricted shares forfeited |
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826
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Unrecognized expense |
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$ 692,000
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$ 40,000
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Aggregate value of shares vested |
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$ 251,000
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Options |
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Class Of Stock [Line Items] |
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Total stock-based compensation expense |
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115,000
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242,000
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504,000
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Unrecognized expense |
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$ 18,000
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134,000
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Unrecognized compensation cost, expected recognition period |
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3 months
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Board of Directors Fees |
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Class Of Stock [Line Items] |
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Total stock-based compensation expense |
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$ 661,000,000
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$ 844,000,000
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$ 733,000,000
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Maximum [Member] |
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Class Of Stock [Line Items] |
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Share price (in dollars per share) |
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$ 35.00
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2015 Option Grants |
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Class Of Stock [Line Items] |
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Number of shares authorized to be repurchased (up to) |
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1,250,000
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2015 Option Grants | Options |
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Class Of Stock [Line Items] |
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Common shares available |
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1,092,000
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2015 Option Grants | Chief Financial Officer | Restricted Stock |
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Class Of Stock [Line Items] |
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Number of restricted shares awarded |
747
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Weighted average fair value (in dollars per share) |
$ 33.50
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2015 Option Grants | Chief Executive Officer | Restricted Stock |
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Class Of Stock [Line Items] |
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Number of restricted shares awarded |
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12,500
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5,000
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2,500
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Weighted average fair value (in dollars per share) |
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$ 40.17
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$ 37.98
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$ 34.41
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2015 Option Grants | President | Restricted Stock |
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Class Of Stock [Line Items] |
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Number of restricted shares awarded |
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12,500
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5,000
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2,500
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Weighted average fair value (in dollars per share) |
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$ 40.17
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$ 37.98
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$ 34.41
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2015 Option Grants | Employees | Restricted Stock |
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Class Of Stock [Line Items] |
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Number of restricted shares awarded |
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7,256
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Weighted average fair value (in dollars per share) |
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$ 35.50
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Number of restricted shares vested |
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1,144
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2015 Option Grants | Executive Officer | Restricted Stock |
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Class Of Stock [Line Items] |
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Number of restricted shares awarded |
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2,224
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Weighted average fair value (in dollars per share) |
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$ 37.13
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Number of restricted shares forfeited |
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674
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2015 Option Grants | Other Executives | Restricted Stock |
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Class Of Stock [Line Items] |
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Number of restricted shares awarded |
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5,885
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Weighted average fair value (in dollars per share) |
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$ 31.20
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2015 Option Grants | Senior Managers | Restricted Stock |
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Class Of Stock [Line Items] |
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Number of restricted shares awarded |
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2,224
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5,885
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Weighted average fair value (in dollars per share) |
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$ 37.13
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$ 31.20
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2015 Option Grants | Minimum |
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Class Of Stock [Line Items] |
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Award vesting period |
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1 year
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2015 Option Grants | Maximum [Member] |
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Class Of Stock [Line Items] |
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Award vesting period |
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6 years
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2020 Option Grants |
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Class Of Stock [Line Items] |
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Employee stock options granted (in shares) |
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118,000
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Shares issued (in dollars per share) |
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$ 33.96
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Percentage of options |
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25.00%
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Period following an executive's termination of employment for a number of reasons |
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18 months
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Period following an executive's termination of employment without cause |
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12 months
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Number of awards vesting (in shares) |
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0
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2020 Option Grants | Tranche One |
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Class Of Stock [Line Items] |
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Percentage of options |
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25.00%
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Period of consecutive trading days |
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20 days
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Amount per share (in dollars per share) |
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$ 35.00
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2020 Option Grants | Tranche Two |
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Class Of Stock [Line Items] |
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Percentage of options |
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25.00%
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Period of consecutive trading days |
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20 days
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Amount per share (in dollars per share) |
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$ 40.00
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2020 Option Grants | Tranche Three |
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Class Of Stock [Line Items] |
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Percentage of options |
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25.00%
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Period of consecutive trading days |
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20 days
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Amount per share (in dollars per share) |
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$ 45.00
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2020 Option Grants | Tranche Four |
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Class Of Stock [Line Items] |
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Percentage of options |
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25.00%
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Period of consecutive trading days |
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20 days
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Amount per share (in dollars per share) |
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$ 50.00
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2020 Option Grants | Options |
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Class Of Stock [Line Items] |
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Grants in period, weighted average (in dollars per share) |
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$ 3.20
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2020 Option Grants | Minimum |
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Class Of Stock [Line Items] |
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Share price (in dollars per share) |
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$ 40.00
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$ 35.00
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2020 Option Grants | Maximum [Member] |
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Class Of Stock [Line Items] |
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Share price (in dollars per share) |
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$ 35.00
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2019 Option Grants |
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Class Of Stock [Line Items] |
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Shares issued (in dollars per share) |
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$ 33.34
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Period following an executive's termination of employment for a number of reasons |
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18 months
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Period following an executive's termination of employment without cause |
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12 months
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Number of awards vesting (in shares) |
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0
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2019 Option Grants | Tranche One |
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Class Of Stock [Line Items] |
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Period of consecutive trading days |
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20 days
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Amount per share (in dollars per share) |
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$ 40.00
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Number of awards vesting (in shares) |
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3,333
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2019 Option Grants | Tranche Two |
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Class Of Stock [Line Items] |
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Period of consecutive trading days |
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20 days
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Amount per share (in dollars per share) |
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$ 45.00
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Number of awards vesting (in shares) |
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3,333
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2019 Option Grants | Tranche Three |
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Class Of Stock [Line Items] |
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|
|
|
|
|
|
Period of consecutive trading days |
|
|
|
|
|
|
|
|
|
|
20 days
|
|
|
|
|
|
|
Amount per share (in dollars per share) |
|
|
|
|
|
|
|
|
|
|
$ 50.00
|
|
|
|
|
|
|
Number of awards vesting (in shares) |
|
|
|
|
|
|
|
|
|
|
3,334
|
|
|
|
|
|
|
2019 Option Grants | Options |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Class Of Stock [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Grants in period, weighted average (in dollars per share) |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
7.10
|
|
|
2019 Option Grants | Chief Financial Officer |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Class Of Stock [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Employee stock options granted (in shares) |
|
|
|
|
|
|
|
|
|
|
10,000
|
|
|
|
|
|
|
2019 Option Grants | Chief Executive Officer | Tranche Two |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Class Of Stock [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Period of consecutive trading days |
|
|
|
|
|
|
|
|
|
20 days
|
|
|
|
|
|
|
|
2019 Option Grants | Maximum [Member] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Class Of Stock [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Share price (in dollars per share) |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
40.00
|
|
|
2018 Option Grants |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Class Of Stock [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Shares issued (in dollars per share) |
|
|
|
|
|
|
|
|
|
|
|
$ 33.60
|
|
|
|
|
|
Percentage of options |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
25.00%
|
|
Period following an executive's termination of employment for a number of reasons |
|
|
|
|
|
|
|
|
|
|
|
18 months
|
|
|
|
|
|
Period following an executive's termination of employment without cause |
|
|
|
|
|
|
|
|
|
|
|
12 months
|
|
|
|
|
|
Number of awards vesting (in shares) |
|
|
|
|
|
|
|
|
|
|
|
|
|
0
|
|
|
|
2018 Option Grants | Tranche One |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Class Of Stock [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Percentage of options |
|
|
|
|
|
|
|
|
|
|
|
25.00%
|
|
|
|
|
|
Period of consecutive trading days |
|
|
|
|
|
|
|
|
|
|
|
20 days
|
|
|
|
|
|
Amount per share (in dollars per share) |
|
|
|
|
|
|
|
|
|
|
|
$ 35.00
|
|
|
|
|
|
2018 Option Grants | Tranche Two |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Class Of Stock [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Percentage of options |
|
|
|
|
|
|
|
|
|
|
|
25.00%
|
|
|
|
|
|
Period of consecutive trading days |
|
|
|
|
|
|
|
|
|
|
|
20 days
|
|
|
|
|
|
Amount per share (in dollars per share) |
|
|
|
|
|
|
|
|
|
|
|
$ 40.00
|
|
|
|
|
|
2018 Option Grants | Tranche Three |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Class Of Stock [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Percentage of options |
|
|
|
|
|
|
|
|
|
|
|
25.00%
|
|
|
|
|
|
Period of consecutive trading days |
|
|
|
|
|
|
|
|
|
|
|
20 days
|
|
|
|
|
|
Amount per share (in dollars per share) |
|
|
|
|
|
|
|
|
|
|
|
$ 45.00
|
|
|
|
|
|
2018 Option Grants | Tranche Four |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Class Of Stock [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Percentage of options |
|
|
|
|
|
|
|
|
|
|
|
25.00%
|
|
|
|
|
|
Period of consecutive trading days |
|
|
|
|
|
|
|
|
|
|
|
20 days
|
|
|
|
|
|
Amount per share (in dollars per share) |
|
|
|
|
|
|
|
|
|
|
|
$ 50.00
|
|
|
|
|
|
2018 Option Grants | Chief Financial Officer |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Class Of Stock [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Employee stock options granted (in shares) |
|
|
|
|
|
|
|
|
|
|
|
90,000
|
|
|
|
|
|
2018 Option Grants | Chief Executive Officer |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Class Of Stock [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Employee stock options granted (in shares) |
|
|
|
|
|
|
|
|
|
|
|
210,000
|
|
|
|
|
|
2018 Option Grants | Chief Executive Officer | Tranche One |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Class Of Stock [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Period of consecutive trading days |
|
|
|
|
|
|
|
|
|
20 days
|
|
|
|
|
|
|
|
Amount per share (in dollars per share) |
|
|
|
|
|
|
|
|
|
$ 35.00
|
|
|
|
|
|
|
|
Number of shares expected to vest (in shares) |
|
|
|
|
|
|
|
|
|
26,250
|
|
|
|
|
|
|
|
2018 Option Grants | Chief Executive Officer | Tranche Two |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Class Of Stock [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Amount per share (in dollars per share) |
|
|
|
|
|
|
|
|
|
$ 40.00
|
|
|
|
|
|
|
|
Number of shares expected to vest (in shares) |
|
|
|
|
|
|
|
|
|
26,250
|
|
|
|
|
|
|
|
2018 Option Grants | Minimum |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Class Of Stock [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Share price (in dollars per share) |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
$ 35.00
|
|
2018 Option Grants | Maximum [Member] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Class Of Stock [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Share price (in dollars per share) |
|
|
|
|
|
|
|
|
|
|
|
|
|
$ 40.00
|
|
|
|
2016 Option Grants |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Class Of Stock [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Shares issued (in dollars per share) |
|
|
|
|
|
|
|
|
|
|
|
|
$ 27.15
|
|
|
|
|
Period following an executive's termination of employment for a number of reasons |
|
|
|
|
|
|
|
|
|
|
|
|
18 months
|
|
|
|
|
Number of awards vesting (in shares) |
|
|
|
|
|
|
|
|
|
|
|
|
|
0
|
|
|
|
2016 Option Grants | Tranche One |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Class Of Stock [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Percentage of options |
|
|
|
|
|
|
|
|
|
|
|
|
25.00%
|
|
|
|
|
Period of consecutive trading days |
|
|
|
|
|
|
|
|
|
|
|
|
20 days
|
|
|
|
|
Amount per share (in dollars per share) |
|
|
|
|
|
|
|
|
|
|
|
|
$ 60.00
|
|
|
|
|
2016 Option Grants | Tranche Two |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Class Of Stock [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Percentage of options |
|
|
|
|
|
|
|
|
|
|
|
|
25.00%
|
|
|
|
|
Period of consecutive trading days |
|
|
|
|
|
|
|
|
|
|
|
|
20 days
|
|
|
|
|
Amount per share (in dollars per share) |
|
|
|
|
|
|
|
|
|
|
|
|
$ 75.00
|
|
|
|
|
2016 Option Grants | Tranche Three |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Class Of Stock [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Percentage of options |
|
|
|
|
|
|
|
|
|
|
|
|
25.00%
|
|
|
|
|
Period of consecutive trading days |
|
|
|
|
|
|
|
|
|
|
|
|
20 days
|
|
|
|
|
Amount per share (in dollars per share) |
|
|
|
|
|
|
|
|
|
|
|
|
$ 90.00
|
|
|
|
|
2016 Option Grants | Tranche Four |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Class Of Stock [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Percentage of options |
|
|
|
|
|
|
|
|
|
|
|
|
25.00%
|
|
|
|
|
Period of consecutive trading days |
|
|
|
|
|
|
|
|
|
|
|
|
20 days
|
|
|
|
|
Amount per share (in dollars per share) |
|
|
|
|
|
|
|
|
|
|
|
|
$ 105.00
|
|
|
|
|
2016 Option Grants | Chief Executive Officer |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Class Of Stock [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Employee stock options granted (in shares) |
|
|
|
|
|
|
|
|
|
|
|
|
300,000
|
|
|
|
|
2016 Option Grants | Board of Directors Chairman |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Class Of Stock [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Employee stock options granted (in shares) |
|
|
|
|
|
|
|
|
|
|
|
|
225,000
|
|
|
|
|
2016 Option Grants | Maximum [Member] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Class Of Stock [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Share price (in dollars per share) |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
60.00
|
|
|
2019 Option Grants | Options |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Class Of Stock [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Grants in period, weighted average (in dollars per share) |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
$ 1.40
|
|
|
2019 Option Grants | Chief Executive Officer | Tranche One |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Class Of Stock [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Shares forfeited (in shares) |
|
|
|
|
|
|
|
|
|
26,250
|
|
|
|
|
|
|
|
2019 Option Grants | Chief Executive Officer | Tranche Two |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Class Of Stock [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Period of consecutive trading days |
|
|
|
|
|
|
|
|
|
20 days
|
|
|
|
|
|
|
|
Shares forfeited (in shares) |
|
|
|
|
|
|
|
|
|
26,250
|
|
|
|
|
|
|
|
2019 Option Grants | Maximum [Member] | Chief Executive Officer | Tranche Two |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Class Of Stock [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Share price (in dollars per share) |
|
|
|
|
|
|
|
|
|
$ 40.00
|
|
|
|
|
|
|
|