Alico, Inc. Annual report pursuant to Section 13 and 15(d)

Annual report pursuant to Section 13 and 15(d)

Common Stock and Options - Narrative (Details)

Common Stock and Options - Narrative (Details) - USD ($)							1 Months Ended	12 Months Ended
	Nov. 10, 2020	Oct. 11, 2019	Feb. 11, 2019	Oct. 25, 2018	Sep. 07, 2018	Dec. 31, 2016	Nov. 30, 2017	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019	Oct. 15, 2019	Oct. 10, 2019	Oct. 03, 2018	May 31, 2017	Mar. 31, 2017	Feb. 27, 2015
Class Of Stock [Line Items]
Number of shares authorized to be repurchased (up to)											7,000	7,000		2,000,000	5,000,000
Total stock-based compensation expense								$ 1,230,000	$ 1,306,000	$ 824,000
Employee stock options granted (in shares)								0	118,000	10,000
Shares issued (in dollars per share)													$ 34.00
Period of consecutive trading days			20 days
Common shares available								218,000	293,000	227,500
Restricted Stock
Class Of Stock [Line Items]
Award vesting period							2 years 6 months
Total stock-based compensation expense								$ 144,000	$ 69,000	$ 104,000
Number of restricted shares awarded	5,885						5,000	5,885
Weighted average fair value (in dollars per share)	$ 31.20						$ 31.95	$ 31.20
Number of restricted shares vested								0	5,666	1,667
Unrecognized expense								$ 40,000	$ 0
Aggregate value of shares vested									251,000	$ 53,000
Options
Class Of Stock [Line Items]
Total stock-based compensation expense								242,000	504,000	674,000
Unrecognized expense								134,000	$ 376,000
Unrecognized compensation cost, expected recognition period									8 months 19 days
Board of Directors Fees
Class Of Stock [Line Items]
Total stock-based compensation expense								$ 844,000,000	$ 733,000,000	$ 869,000,000
Maximum [Member]
Class Of Stock [Line Items]
Share price (in dollars per share)			$ 35.00
2015 Option Grants
Class Of Stock [Line Items]
Number of shares authorized to be repurchased (up to)																1,250,000
2015 Option Grants \| Options
Class Of Stock [Line Items]
Common shares available								1,014,500
2015 Option Grants \| Minimum
Class Of Stock [Line Items]
Award vesting period								1 year
2015 Option Grants \| Maximum [Member]
Class Of Stock [Line Items]
Award vesting period								6 years
2020 Option Grants
Class Of Stock [Line Items]
Employee stock options granted (in shares)		118,000
Shares issued (in dollars per share)		$ 33.96
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
2020 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
2020 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
2020 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
2020 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
2020 Option Grants \| Options
Class Of Stock [Line Items]
Grants in period, weighted average (in dollars per share)								$ 3.20
2020 Option Grants \| Minimum
Class Of Stock [Line Items]
Share price (in dollars per share)								$ 40.00	$ 35.00
2020 Option Grants \| Maximum [Member]
Class Of Stock [Line Items]
Share price (in dollars per share)									$ 35.00
2019 Option Grants
Class Of Stock [Line Items]
Shares issued (in dollars per share)				$ 33.34
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
2019 Option Grants \| Tranche One
Class Of Stock [Line Items]
Period of consecutive trading days				20 days
Amount per share (in dollars per share)				$ 40.00
Number of awards vesting (in shares)				3,333
2019 Option Grants \| Tranche Two
Class Of Stock [Line Items]
Period of consecutive trading days				20 days
Amount per share (in dollars per share)				$ 45.00
Number of awards vesting (in shares)				3,333
2019 Option Grants \| Tranche Three
Class Of Stock [Line Items]
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 \| 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]
Period of consecutive trading days			20 days
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