CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands	Stockholders' Equity Attributable to Lannett Co., Inc.	Common Stock	Additional Paid-In Capital	Retained Earnings	Accumulated Other Comprehensive Loss	Treasury Stock	Noncontrolling Interest	Total
Balance at Jun. 30, 2013	$ 128,576	$ 29	$ 104,075	$ 26,553	$ (47)	$ (2,034)	$ 233	$ 128,809
Balance (in shares) at Jun. 30, 2013		29,285
Increase (Decrease) in Shareholders' Equity
Shares issued in connection with share-based compensation plans	5,369	$ 1	5,368					5,369
Shares issued in connection with share-based compensation plans (in shares)		1,053
Share-based compensation	9,026		9,026					9,026
Shares issued in connection with the JSP contract renewal	20,100	$ 2	20,098					20,100
Shares issued in connection with the JSP contract renewal (in shares)		1,500
Shares issued in connection with stock offering	71,478	$ 4	71,474					71,478
Shares issued in connection with stock offering (in shares)		4,250
Excess tax benefits on share-based compensation awards	6,752		6,752					6,752
Purchase of treasury stock	(3,925)					(3,925)		(3,925)
Other comprehensive loss, net of income tax	(7)				(7)			(7)
Net income	57,101			57,101			62	57,163
Balance at Jun. 30, 2014	294,470	$ 36	216,793	83,654	(54)	(5,959)	295	294,765
Balance (in shares) at Jun. 30, 2014		36,088
Increase (Decrease) in Shareholders' Equity
Shares issued in connection with share-based compensation plans	4,938	$ 1	4,937					4,938
Shares issued in connection with share-based compensation plans (in shares)		695
Share-based compensation	6,397		6,397					6,397
Excess tax benefits on share-based compensation awards	8,051		8,051					8,051
Purchase of treasury stock	(121)					(121)		(121)
Distribution to noncontrolling interests							(15)	(15)
Other comprehensive loss, net of income tax	(241)				(241)			(241)
Net income	149,919			149,919			73	149,992
Balance at Jun. 30, 2015	463,413	$ 37	236,178	233,573	(295)	(6,080)	353	463,766
Balance (in shares) at Jun. 30, 2015		36,783
Increase (Decrease) in Shareholders' Equity
Shares issued in connection with share-based compensation plans	4,134		4,134					4,134
Shares issued in connection with share-based compensation plans (in shares)		367
Share-based compensation	11,562		11,562					11,562
Excess tax benefits on share-based compensation awards	1,507		1,507					1,507
Purchase of treasury stock	(1,269)					(1,269)		(1,269)
Issuance of warrant	29,920		29,920					29,920
Distribution to noncontrolling interests							(20)	(20)
Net income	44,782			44,782			75	44,857
Balance at Jun. 30, 2016	$ 554,049	$ 37	$ 283,301	$ 278,355	$ (295)	$ (7,349)	$ 408	$ 554,457
Balance (in shares) at Jun. 30, 2016		37,150