SCHEDULE II VALUATION AND QUALIFYING ACCOUNTS (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2012
Provision for doubtful accounts and sales allowances
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Year	$ 409	$ 1,093	$ 951
Charged to Expenses or Other Accounts	179	468	758
Deductions	(301)	(1,152)	(616)
Balance at End of Year	287	409	1,093
Provision for returns
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Year	8,957	7,613	10,437
Charged to Expenses or Other Accounts	18,469	21,111	16,660
Deductions	(21,225)	(19,767)	(19,484)
Balance at End of Year	6,201	8,957	7,613
Provision for promotions and rebates
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Year	13,675	12,756	10,460
Charged to Expenses or Other Accounts	35,207	33,343	34,170
Deductions	(34,079)	(32,424)	(31,874)
Balance at End of Year	14,803	13,675	12,756
Inventory reserves
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Year	4,775	5,712	7,423
Charged to Expenses or Other Accounts	4,138	1,089	2,154
Deductions	(1,697)	(2,026)	(3,865)
Balance at End of Year	7,216	4,775	5,712
Valuation allowance for deferred tax assets
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Year	5,984	6,088	5,274
Charged to Expenses or Other Accounts	0	89	1,259
Deductions	(2,633)	(193)	(445)
Balance at End of Year	$ 3,351	$ 5,984	$ 6,088