CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended	6 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2014	Dec. 31, 2013
CONSOLIDATED STATEMENTS OF OPERATIONS
Net sales	$ 114,822us-gaap_SalesRevenueNet	$ 67,326us-gaap_SalesRevenueNet	$ 208,209us-gaap_SalesRevenueNet	$ 113,155us-gaap_SalesRevenueNet
Cost of sales	27,621us-gaap_CostOfGoodsAndServicesSold	26,284us-gaap_CostOfGoodsAndServicesSold	49,441us-gaap_CostOfGoodsAndServicesSold	50,707us-gaap_CostOfGoodsAndServicesSold
JSP contract renewal cost				20,100lci_JSPContractRenewalCost
Gross profit	87,201us-gaap_GrossProfit	41,042us-gaap_GrossProfit	158,768us-gaap_GrossProfit	42,348us-gaap_GrossProfit
Operating expenses:
Research and development	7,836us-gaap_ResearchAndDevelopmentExpense	5,785us-gaap_ResearchAndDevelopmentExpense	14,199us-gaap_ResearchAndDevelopmentExpense	10,530us-gaap_ResearchAndDevelopmentExpense
Selling, general, and administrative	12,822	9,890	23,375	17,069
Total operating expenses	20,658us-gaap_OperatingExpenses	15,675us-gaap_OperatingExpenses	37,574us-gaap_OperatingExpenses	27,599us-gaap_OperatingExpenses
Operating income	66,543us-gaap_OperatingIncomeLoss	25,367us-gaap_OperatingIncomeLoss	121,194us-gaap_OperatingIncomeLoss	14,749us-gaap_OperatingIncomeLoss
Other income (expense):
Gain (loss) on sale of assets		7us-gaap_GainLossOnDispositionOfAssets	20us-gaap_GainLossOnDispositionOfAssets	(55)us-gaap_GainLossOnDispositionOfAssets
Gain on investment securities	680us-gaap_MarketableSecuritiesGainLoss	1,102us-gaap_MarketableSecuritiesGainLoss	695us-gaap_MarketableSecuritiesGainLoss	1,565us-gaap_MarketableSecuritiesGainLoss
Interest and dividend income	106	49	208	95
Interest expense	(73)us-gaap_InterestExpense	(46)us-gaap_InterestExpense	(111)us-gaap_InterestExpense	(104)us-gaap_InterestExpense
Other		(87)us-gaap_OtherNonoperatingExpense		(87)us-gaap_OtherNonoperatingExpense
Total other income	713us-gaap_OtherNonoperatingIncomeExpense	1,025us-gaap_OtherNonoperatingIncomeExpense	812us-gaap_OtherNonoperatingIncomeExpense	1,414us-gaap_OtherNonoperatingIncomeExpense
Income before income tax	67,256	26,392	122,006	16,163
Income tax expense	22,435us-gaap_IncomeTaxExpenseBenefit	9,800us-gaap_IncomeTaxExpenseBenefit	42,235us-gaap_IncomeTaxExpenseBenefit	5,558us-gaap_IncomeTaxExpenseBenefit
Net income	44,821us-gaap_ProfitLoss	16,592us-gaap_ProfitLoss	79,771us-gaap_ProfitLoss	10,605us-gaap_ProfitLoss
Less: Net income attributable to noncontrolling interest	10	26	28	34
Net income attributable to Lannett Company, Inc.	$ 44,811	$ 16,566	$ 79,743	$ 10,571
Earnings per common share attributable to Lannett Company, Inc.:
Basic (in dollars per share)	$ 1.26us-gaap_EarningsPerShareBasic	$ 0.48us-gaap_EarningsPerShareBasic	$ 2.24us-gaap_EarningsPerShareBasic	$ 0.33us-gaap_EarningsPerShareBasic
Diluted (in dollars per share)	$ 1.21us-gaap_EarningsPerShareDiluted	$ 0.46us-gaap_EarningsPerShareDiluted	$ 2.15us-gaap_EarningsPerShareDiluted	$ 0.31us-gaap_EarningsPerShareDiluted
Weighted average common shares outstanding:
Basic (in shares)	35,669,904	34,677,426	35,633,917	32,131,831
Diluted (in shares)	37,074,024	36,276,326	37,025,667	33,561,454

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Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration