Earnings Per Common Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Earnings Per Common Share
Net Income Attributable to Lannett Company, Inc	$ 33,181	$ 34,932
Basic weighted average common shares outstanding	36,310,653	35,597,931
Effect of potentially dilutive options and restricted stock awards	1,104,071	1,374,715
Diluted weighted average common shares outstanding	37,414,724	36,972,646
Earnings per common share attributable to Lannett Company, Inc.:
Basic (in dollars per share)	$ 0.91	$ 0.98
Diluted (in dollars per share)	$ 0.89	$ 0.94
Anti-dilutive shares excluded in the computation of diluted earnings per share	139,000	436,000