DETAILS OF CERTAIN BALANCE SHEET ACCOUNTS (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Mar. 31, 2014
Accounts receivable, net [Line Items]
Accounts receivable	$ 162,579		$ 159,592
Accounts receivable, net	140,427		138,301
Inventory, net [Abstract]
Raw materials	29,560		28,071
Work in process	1,715		985
Finished goods	32,276		28,076
Inventory, net	63,551		57,132
Accrued Liabilities [Abstract]
Employee compensation and benefits	25,089		32,280
Warranty obligation	7,855	12,881
Income taxes payable	2,628		3,092
Accrued other	20,557		23,514
Accrued liabilities	56,129		66,851
Changes in the Warranty Obligation [Roll Forward]
Warranty obligation	7,965	13,410
Warranty provision related to products shipped	5,200	4,744
Deductions for warranty claims processed	(4,482)	(4,889)
Adjustments related to preexisting warranties	(828)	(384)
Warranty obligation	7,855	12,881
Provisions for returns [Member]
Accounts receivable, net [Line Items]
Accounts Receivable Reserves	(6,665)		(6,201)
Provisions for promotions, rebates, and other [Member]
Accounts receivable, net [Line Items]
Accounts Receivable Reserves	(15,272)		(14,803)
Provisions for doubtful accounts and sales allowances [Member]
Accounts receivable, net [Line Items]
Accounts Receivable Reserves	$ (215)		$ (287)