Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Mar. 31, 2020
Deferred tax assets
Amortization and impairment of intangible assets	$ 7,302	$ 11,471
Nonvested stock-based compensation	7,138	5,194
Operating lease liability	37,707	45,600
Uniform capitalization adjustment to inventory	5,256	4,322
Bad debt allowance and other reserves	19,321	14,243
Accrued bonuses	8,491	6,187
Foreign currency translation	646	645
Net operating loss carry-forwards, net of valuation allowances	1,663	2,071
Other	3,048	1,372
Gross deferred tax assets	90,572	91,105
Valuation allowances	(1,197)	(1,519)
Total	89,375	89,586
Deferred tax liabilities
Prepaid expenses	(3,829)	(4,252)
Operating lease asset	(30,754)	(41,276)
Depreciation of property and equipment	(17,598)	(15,825)
Total	(52,181)	(61,353)
Deferred tax assets, net	$ 37,194	$ 28,233