SUPPLEMENTARY FINANCIAL INFORMATION (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2011
Movement in valuation and qualifying accounts
Beginning Balance	$ 51,002	$ 42,900	$ 72,535
Additions	109,594	119,462	90,162
Deductions	(95,901)	(110,169)	(119,388)
Other	(614)	(1,191)	(409)
Ending Balance	64,081	51,002	42,900
Valuation allowance for deferred income taxes
Movement in valuation and qualifying accounts
Beginning Balance	134,168	114,643	141,231
Additions		19,525
Deductions	(1,256)		(26,588)
Ending Balance	132,912	134,168	114,643
Sales returns, price protection and other allowances
Movement in valuation and qualifying accounts
Beginning Balance	50,290	42,104	71,764
Additions	109,107	119,462	90,119
Deductions	(95,901)	(110,085)	(119,356)
Other	(616)	(1,191)	(423)
Ending Balance	62,880	50,290	42,104
Price concessions
Movement in valuation and qualifying accounts
Additions	66,207	85,977	59,894
Returns
Movement in valuation and qualifying accounts
Additions	14,976	9,608	8,721
Other sales allowances
Movement in valuation and qualifying accounts
Additions	27,924	23,877	21,504
Allowance for doubtful accounts
Movement in valuation and qualifying accounts
Beginning Balance	712	796	771
Additions	487		43
Deductions		(84)	(32)
Other	2		14
Ending Balance	$ 1,201	$ 712	$ 796