Schedule II VALUATION AND QUALIFYING ACCOUNTS (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2018
Valuation and qualifying accounts
Balance at Beginning of Year	$ 18,824	$ 33,462
Balance at End of Year	21,146	18,824	$ 33,462
Allowance for doubtful accounts
Valuation and qualifying accounts
Balance at Beginning of Year	5,073	3,487	5,979
Additions	3,498	2,849	4,168
Deductions	(1,582)	(1,263)	(6,660)
Balance at End of Year	6,989	5,073	3,487
Allowance for sales discounts
Valuation and qualifying accounts
Balance at Beginning of Year	710	1,400	3,100
Additions	14,845	11,712	19,972
Deductions	(14,525)	(12,402)	(21,672)
Balance at End of Year	1,030	710	1,400
Allowance for chargebacks
Valuation and qualifying accounts
Balance at Beginning of Year	13,041	7,727	7,028
Additions	13,399	23,369	19,019
Deductions	(13,313)	(18,055)	(18,320)
Balance at End of Year	13,127	13,041	7,727
Allowance for sales returns
Valuation and qualifying accounts
Balance at Beginning of Year	$ 0	20,848	16,247
Additions		0	51,677
Deductions		(20,848)	(47,076)
Balance at End of Year		$ 0	$ 20,848