Earnings (Loss) Per Common Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Earnings (Loss) Per Common Share
Net income (loss) attributable to Lannett Company, Inc.	$ (29,408)	$ 33,181
Basic weighted average common shares outstanding	36,699,267	36,310,653
Effect of potentially dilutive stock options and restricted stock awards		1,104,071
Diluted weighted average common shares outstanding	36,699,267	37,414,724
Earnings (loss) per common share attributable to Lannett Company, Inc.:
Basic (in dollars per share)	$ (0.80)	$ 0.91
Diluted (in dollars per share)	$ (0.80)	$ 0.89
Anti-dilutive shares excluded in the computation of diluted earnings per share	4,300,000	139,000