Income Taxes (Components of Deferred Tax Balances) (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Mar. 31, 2021
Deferred Tax Assets
Allowance for doubtful accounts and sales returns	$ 4,605	$ 4,267
Inventory capitalization	2,201	1,124
Inventory reserves	1,264	1,119
Net operating loss carryforwards	115	115
State income taxes	9,661	10,028
Accrued liabilities	2,026	1,078
Accrued compensation	4,597	3,736
Stock compensation	4,548	4,369
Foreign tax credit	0	699
Lease liability	6,808	8,132
Unrealized foreign exchange loss	215	384
Other	5,682	5,916
Total deferred tax assets	41,722	40,967
Deferred Tax Liabilities
Property, plant and equipment	(7,210)	(7,245)
Intangible assets	(471,327)	(458,713)
Deferred cumulative catch-up adjustments - revenue recognition adjustments	0	(264)
Right-of-use asset	(6,239)	(7,605)
Total deferred tax liabilities	(484,776)	(473,827)
Net deferred tax liability	$ (443,054)	$ (432,860)