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Income Taxes (Components of Deferred Tax Balances) (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Mar. 31, 2018
Deferred Tax Assets    
Allowance for doubtful accounts and sales returns $ 3,285 $ 2,806
Inventory capitalization 1,245 1,176
Inventory reserves 1,267 540
Net operating loss carryforwards 226 609
State income taxes 9,003 10,154
Accrued liabilities 1,785 2,210
Accrued compensation 4,416 4,992
Stock compensation 4,206 5,038
Foreign tax credit 3,236 0
Interest 154 0
Other 7,691 4,975
Total deferred tax assets 36,514 32,500
Deferred Tax Liabilities    
Property, plant and equipment (6,002) (6,032)
Intangible assets (425,134) (467,388)
Adoption of revenue recognition standard (721) 0
Total deferred tax liabilities (431,857) (473,420)
Net deferred tax liability before valuation allowance (395,343) (440,920)
Valuation allowance (3,236) (609)
Net deferred tax liability $ (398,579) $ (441,529)