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
Allowance for doubtful accounts
VALUATION AND QUALIFYING ACCOUNTS
Balance at beginning of period	$ 2,153	$ 2,472	$ 4,086
Charged (credited) to Statement of Operations	656	(107)	(592)
Claims and adjustments applied against allowances	(1,097)	(212)	(1,022)
Balance at end of period	1,712	2,153	2,472
Allowance for sales return
VALUATION AND QUALIFYING ACCOUNTS
Balance at beginning of period	21,883	24,599	29,666
Charged (credited) to Statement of Operations	59,483	61,315	72,543
Claims and adjustments applied against allowances	(61,894)	(64,031)	(77,610)
Balance at end of period	19,472	21,883	24,599
Allowances for cooperative marketing arrangements
VALUATION AND QUALIFYING ACCOUNTS
Balance at beginning of period	24,160	24,109	28,669
Charged (credited) to Statement of Operations	102,751	96,278	101,557
Claims and adjustments applied against allowances	(102,776)	(96,227)	(106,117)
Balance at end of period	24,135	24,160	24,109
Allowances for customer incentive programs
VALUATION AND QUALIFYING ACCOUNTS
Balance at beginning of period	42,857	42,262	52,358
Charged (credited) to Statement of Operations	106,810	94,313	108,683
Claims and adjustments applied against allowances	(108,267)	(93,718)	(118,779)
Balance at end of period	41,400	42,857	42,262
Allowances for pricing programs
VALUATION AND QUALIFYING ACCOUNTS
Balance at beginning of period	55,858	60,371	62,258
Charged (credited) to Statement of Operations	221,702	182,916	196,808
Claims and adjustments applied against allowances	(208,114)	(187,429)	(198,695)
Balance at end of period	69,446	55,858	60,371
Tax valuation allowances
VALUATION AND QUALIFYING ACCOUNTS
Balance at beginning of period	6,014	2,205	2,309
Charged (credited) to Statement of Operations	515	3,865
Claims and adjustments applied against allowances	(1,657)	(56)	(104)
Balance at end of period	$ 4,872	$ 6,014	$ 2,205