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Income Taxes (Components of Deferred Tax Balances) (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Mar. 31, 2017
Deferred Tax Assets    
Allowance for doubtful accounts and sales returns $ 2,806 $ 5,280
Inventory capitalization 1,176 1,881
Inventory reserves 540 1,880
Net operating loss carryforwards 609 609
State income taxes 10,154 17,727
Accrued liabilities 2,210 2,174
Accrued compensation 4,992 9,574
Stock compensation 5,038 5,790
Other 4,975 7,925
Total deferred tax assets 32,500 52,840
Deferred Tax Liabilities    
Property, plant and equipment (6,032) (9,157)
Intangible assets (467,388) (754,322)
Total deferred tax liabilities (473,420) (763,479)
Net deferred tax liability before valuation allowance (440,920) (710,639)
Valuation allowance (609) (3,437)
Net deferred tax liability $ (441,529) $ (714,076)