Schedule II Valuation and Qualifying Accounts (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017
Allowance for Sales Returns
Valuation And Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Year	$ 5,520	$ 7,213	$ 7,541
Additions	4,969	3,964	11,330
Deductions	(5,730)	(5,657)	(11,658)
Balance at End of Year	4,759	5,520	7,213
Allowance for Doubtful Accounts
Valuation And Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Year	3,876	2,757	2,902
Additions	5,644	5,913	5,082
Deductions	(3,466)	(4,794)	(5,227)
Balance at End of Year	6,054	3,876	2,757
Valuation Allowance for Deferred Taxes
Valuation And Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Year	2,893	2,073	2,551
Additions	708	0	0
Acquisition Related Additions	0	922	(267)
Deductions	(38)	(102)	(211)
Balance at End of Year	$ 3,563	$ 2,893	$ 2,073