Alico, Inc. Quarterly report pursuant to Section 13 or 15(d)

Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity - Narrative (Details)

Stockholders' Equity - Narrative (Details)								1 Months Ended	3 Months Ended			9 Months Ended		12 Months Ended
Stockholders' Equity - Narrative (Details)	Oct. 25, 2018 $ / shares shares	Oct. 03, 2018 USD ($) $ / shares shares	Sep. 07, 2018 $ / shares shares	Sep. 05, 2018 shares	Apr. 27, 2018 USD ($)	Apr. 16, 2018 USD ($)	Dec. 31, 2016 $ / shares shares	Nov. 30, 2017 $ / shares shares	Jun. 30, 2019 USD ($) $ / shares shares	Mar. 31, 2019 USD ($)	Jun. 30, 2018 USD ($)	Jun. 30, 2019 USD ($) $ / shares shares	Jun. 30, 2018 USD ($)	Sep. 30, 2018 USD ($) $ / shares	Sep. 30, 2016 $ / shares	Sep. 30, 2015 executive $ / shares shares	Sep. 30, 2017 shares	May 31, 2017 shares	Mar. 31, 2017 shares
Class of Stock [Line Items]
Shares issued (in dollars per share)		$ 34.00
Shares of common stock authorized to be repurchased (up to) (in shares) \| shares																	7,000,000	2,000,000	5,000,000
Shares issued (in shares) \| shares		752,234
Cost of shares \| $		$ 25,575,956
Cash capital contribution required, due to catastrophe \| $						$ 2,041,000
Capital contribution received from parent \| $					$ 1,041,000
Capital contribution received from noncontrolling interest \| $					$ 1,000,000							$ 0	$ 1,000,000
Corporate, General and Administrative Expense
Class of Stock [Line Items]
Stock-based compensation expense \| $									$ 200,000		$ 238,000	676,000	621,000
Restricted Stock
Class of Stock [Line Items]
Stock-based compensation expense \| $									25,000		37,000	77,000	100,000
Restricted shares awarded (in shares) \| shares								5,000								12,500
Number of senior executives \| executive																2
Weighted average fair value (in dollars per share)								$ 31.95								$ 49.49
Award vesting period								3 years
Unrecognized expense \| $									95,000			95,000		$ 172,000
Employee Stock Option
Class of Stock [Line Items]
Stock-based compensation expense \| $									89,000		$ 205,000	607,000	$ 616,000
Unrecognized expense \| $									569,000			569,000		$ 2,842,000
Stock option credit \| $									$ 0			$ 823,000
Weighted average remaining contractual term												1 year 5 months 19 days
Minimum \| Restricted Stock
Class of Stock [Line Items]
Award vesting period																3 years
Maximum \| Restricted Stock
Class of Stock [Line Items]
Award vesting period																5 years
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
Share price (in dollars per share)									$ 30.34			$ 30.34
2019 Option Grants \| Mr. Kiernan
Class of Stock [Line Items]
Options granted in period (in shares) \| shares	10,000
2019 Option Grants \| Tranche One
Class of Stock [Line Items]
Number of awards vesting (in shares) \| shares	3,333
Period of consecutive trading days	20 days
Amount per share (in dollars per share)	$ 40.00
2019 Option Grants \| Tranche Two
Class of Stock [Line Items]
Number of awards vesting (in shares) \| shares	3,333
Period of consecutive trading days	20 days
Amount per share (in dollars per share)	$ 45.00
2019 Option Grants \| Tranche Three
Class of Stock [Line Items]
Number of awards vesting (in shares) \| shares	3,334
Period of consecutive trading days	20 days
Amount per share (in dollars per share)	$ 50.00
2019 Option Grants \| Employee Stock Option
Class of Stock [Line Items]
Grants in period, weighted average (in dollars per share)												7.10
2019 Option Grants \| Maximum
Class of Stock [Line Items]
Share price (in dollars per share)									40.00			40.00
2018 Option Grants
Class of Stock [Line Items]
Stock-based compensation expense \| $										$ (823,000)
Shares issued (in dollars per share)			$ 33.60
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
Share price (in dollars per share)									30.34			$ 30.34
2018 Option Grants \| Mr. Kiernan
Class of Stock [Line Items]
Options granted in period (in shares) \| shares			90,000
2018 Option Grants \| Remy W. Trafelet
Class of Stock [Line Items]
Options granted in period (in shares) \| shares			210,000
2018 Option Grants \| Tranche One
Class of Stock [Line Items]
Period of consecutive trading days			20 years
Amount per share (in dollars per share)			$ 35.00
Percentage of options			25.00%
2018 Option Grants \| Tranche One \| Henry R. Slack
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) \| shares												26,250
2018 Option Grants \| Tranche Two
Class of Stock [Line Items]
Period of consecutive trading days			20 years
Amount per share (in dollars per share)			$ 40.00
Percentage of options			25.00%
2018 Option Grants \| Tranche Two \| Henry R. Slack
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) \| shares												26,250
2018 Option Grants \| Tranche Three
Class of Stock [Line Items]
Period of consecutive trading days			20 years
Amount per share (in dollars per share)			$ 45.00
Percentage of options			25.00%
2018 Option Grants \| Tranche Four
Class of Stock [Line Items]
Period of consecutive trading days			20 years
Amount per share (in dollars per share)			$ 50.00
Percentage of options			25.00%
2018 Option Grants \| Employee Stock Option
Class of Stock [Line Items]
Grants in period, weighted average (in dollars per share)														$ 7.40
2018 Option Grants \| Maximum
Class of Stock [Line Items]
Share price (in dollars per share)									35.00			$ 35.00
2016 Option Grants
Class of Stock [Line Items]
Shares issued (in dollars per share)							$ 27.15
Period of consecutive trading days							20 days
Period following an executive's termination of employment for a number of reasons							18 months
Share price (in dollars per share)									30.34			30.34
2016 Option Grants \| Remy W. Trafelet
Class of Stock [Line Items]
Options granted in period (in shares) \| shares							300,000
2016 Option Grants \| Henry R. Slack
Class of Stock [Line Items]
Unrecognized expense \| $														$ 783,000
Options granted in period (in shares) \| shares							225,000
Shares forfeited (in shares) \| shares				187,500
2016 Option Grants \| George R. Brokaw
Class of Stock [Line Items]
Options granted in period (in shares) \| shares							225,000
Shares forfeited (in shares) \| shares				187,500
2016 Option Grants \| Tranche One
Class of Stock [Line Items]
Amount per share (in dollars per share)							$ 60.00
Percentage of options							25.00%
2016 Option Grants \| Tranche Two
Class of Stock [Line Items]
Amount per share (in dollars per share)							$ 75.00
Percentage of options							25.00%
2016 Option Grants \| Tranche Three
Class of Stock [Line Items]
Amount per share (in dollars per share)							$ 90.00
Percentage of options							25.00%
2016 Option Grants \| Tranche Four
Class of Stock [Line Items]
Amount per share (in dollars per share)							$ 105.00
Percentage of options							25.00%
2016 Option Grants \| Employee Stock Option
Class of Stock [Line Items]
Grants in period, weighted average (in dollars per share)															$ 3.53
2016 Option Grants \| Maximum
Class of Stock [Line Items]
Share price (in dollars per share)									$ 60.00			60.00
2019 Modified Option Grants \| Employee Stock Option
Class of Stock [Line Items]
Grants in period, weighted average (in dollars per share)												$ 1.40
2015 Option Grants \| Employee Stock Option
Class of Stock [Line Items]
Common shares available (in shares) \| shares									1,005,000			1,005,000