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Income Taxes (Components of Deferred Tax Balances) (Details) - USD ($)
Mar. 31, 2021
Mar. 31, 2020
Deferred Tax Assets    
Allowance for doubtful accounts and sales returns $ 4,267,000 $ 4,996,000
Inventory capitalization 1,124,000 1,168,000
Inventory reserves 1,119,000 705,000
Net operating loss carryforwards 115,000 115,000
State income taxes 10,028,000 8,896,000
Accrued liabilities 1,078,000 1,308,000
Accrued compensation 3,736,000 4,472,000
Stock compensation 4,369,000 4,334,000
Foreign tax credit 699,000 5,441,000
Lease liability 8,132,000 8,228,000
Unrealized foreign exchange loss 384,000 257,000
Other 5,916,000 13,191,000
Total deferred tax assets 40,967,000 53,111,000
Deferred Tax Liabilities    
Property, plant and equipment (7,245,000) (7,590,000)
Intangible assets (458,713,000) (438,601,000)
Deferred cumulative catch-up adjustments - revenue recognition adjustments (264,000) (522,000)
Right-of-use asset (7,605,000) (7,876,000)
Total deferred tax liabilities (473,827,000) (454,589,000)
Net deferred tax liability before valuation allowance (432,860,000) (401,478,000)
Valuation allowance 0 (5,441,000)
Net deferred tax liability $ (432,860,000) $ (406,919,000)