Schedule II VALUATION AND QUALIFYING ACCOUNTS (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015
Valuation and qualifying accounts
Balance at Beginning of Year	$ 30,195	$ 18,218
Balance at End of Year	32,354	30,195	$ 18,218
Total Allowances	30,195	18,218	18,218
Allowance for doubtful accounts
Valuation and qualifying accounts
Balance at Beginning of Year	5,494	2,297	1,798
Additions	2,847	5,120	1,107
Deductions	(2,362)	(1,923)	(608)
Balance at End of Year	5,979	5,494	2,297
Total Allowances	5,494	2,297	1,798
Allowance for sales discounts
Valuation and qualifying accounts
Balance at Beginning of Year	2,672	2,348	2,121
Additions	20,259	25,560	22,869
Deductions	(19,831)	(25,236)	(22,642)
Balance at End of Year	3,100	2,672	2,348
Total Allowances	2,672	2,348	2,121
Allowance for sales returns
Valuation and qualifying accounts
Balance at Beginning of Year	4,968	4,041	3,064
Additions	4,138	2,267	2,610
Deductions	(2,078)	(1,340)	(1,633)
Balance at End of Year	7,028	4,968	4,041
Total Allowances	4,968	4,041	3,064
Chargeback allowance
Valuation and qualifying accounts
Balance at Beginning of Year	17,061	9,532	8,586
Additions	62,122	42,392	31,253
Deductions	(62,936)	(34,863)	(30,307)
Balance at End of Year	16,247	17,061	9,532
Total Allowances	$ 17,061	$ 9,532	$ 8,586