Earnings (Loss) Per Common Share (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Sep. 30, 2014	Sep. 30, 2013
Earnings (Loss) Per Common Share
Net Income (Loss) Attributable to Lannett Company, Inc	$ 34,932	$ (5,995)
Basic weighted average common shares outstanding	35,597,931	29,586,237
Effect of potentially dilutive options and restricted stock awards (in shares)	1,374,715
Diluted weighted average common shares outstanding	36,972,646	29,586,237
Earnings (loss) per common share attributable to Lannett Company, Inc.:
Basic (in dollars per share)	$ 0.98	$ (0.20)
Diluted (in dollars per share)	$ 0.94	$ (0.20)
Anti-dilutive shares excluded in the computation of diluted earnings per share	436,000	3,000,000