SCHEDULE II VALUATION AND QUALIFYING ACCOUNTS (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2014
Provision for doubtful accounts and sales allowances
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Year	$ 1,221	$ 287	$ 409
Charged to Expenses or Other Accounts	719	1,351	179
Deductions	(1,376)	(417)	(301)
Balance at End of Year	564	1,221	287
Provision for returns
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Year	6,194	6,201	8,957
Charged to Expenses or Other Accounts	27,635	25,174	18,469
Deductions	(26,515)	(25,181)	(21,225)
Balance at End of Year	7,314	6,194	6,201
Provision for promotions and rebates
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Year	15,401	14,803	13,675
Charged to Expenses or Other Accounts	95,933	53,353	35,207
Deductions	(83,597)	(52,755)	(34,079)
Balance at End of Year	27,737	15,401	14,803
Inventory reserves
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Year	5,038	7,216	4,775
Charged to Expenses or Other Accounts	1,918	329	4,263
Deductions	(3,136)	(2,507)	(1,822)
Balance at End of Year	3,820	5,038	7,216
Valuation allowance for deferred tax assets
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Year	1,940	3,351	5,984
Charged to Expenses or Other Accounts	1,962	0	0
Deductions	(1,940)	(1,411)	(2,633)
Balance at End of Year	$ 1,962	$ 1,940	$ 3,351