DETAILS OF CERTAIN BALANCE SHEET ACCOUNTS (Details) (USD $)	3 Months Ended		9 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Mar. 31, 2012
Accounts Receivable, net [Line Items]
Accounts Receivable	$ 135,654,000		$ 135,654,000		$ 133,233,000
Accounts receivable, net	112,677,000		112,677,000		111,771,000
Inventory, net [Abstract]
Raw materials	34,600,000		34,600,000		21,246,000
Work in process	276,000		276,000		367,000
Finished goods	32,029,000		32,029,000		32,100,000
Inventory, Net	66,905,000		66,905,000		53,713,000
Property, Plant and Equipment, Net [Abstract]
Land	13,961,000		13,961,000		6,531,000
Buildings and improvements	74,796,000		74,796,000		67,417,000
Machinery and equipment	87,102,000		87,102,000		90,643,000
Software	30,000,000		30,000,000		28,951,000
Construction in progress	6,273,000		6,273,000		2,323,000
Property, Plant and Equipment, Gross	212,132,000		212,132,000		195,865,000
Accumulated depreciation and amortization	(118,580,000)		(118,580,000)		(119,706,000)
Property, plant and equipment, net	93,552,000		93,552,000		76,159,000
Depreciation and amortization	4,100,000	3,400,000	11,800,000	9,900,000
Unamortized capitalized computer software costs	6,200,000		6,200,000		6,700,000
Capitalized Computer Software, Amortization			2,200,000	2,300,000
Accrued Liabilities [Abstract]
Employee compensation and benefits	26,842,000		26,842,000		24,458,000
Warranty obligation	13,055,000		13,055,000		13,346,000
Accrued advertising and sales and marketing	1,902,000		1,902,000		1,152,000
Restructuring and other related charges	1,868,000		1,868,000		0
Accrued other	14,603,000		14,603,000		13,111,000
Accrued liabilities	58,270,000		58,270,000		52,067,000
Changes in the Warranty Obligation [Roll Forward]
Warranty obligation at March 31, 2012			13,346,000
Warranty provision relating to products shipped			11,856,000
Deductions for warranty claims processed			(12,147,000)
Warranty obligation at December 31, 2012	13,055,000		13,055,000
Buildings and improvements [Member] | Minimum [Member]
Property, Plant and Equipment, Net [Abstract]
Property, Plant and Equipment, Estimated Useful Lives			7 years
Buildings and improvements [Member] | Maximum [Member]
Property, Plant and Equipment, Net [Abstract]
Property, Plant and Equipment, Estimated Useful Lives			30 years
Machinery and equipment [Member] | Minimum [Member]
Property, Plant and Equipment, Net [Abstract]
Property, Plant and Equipment, Estimated Useful Lives			2 years
Machinery and equipment [Member] | Maximum [Member]
Property, Plant and Equipment, Net [Abstract]
Property, Plant and Equipment, Estimated Useful Lives			10 years
Software [Member] | Minimum [Member]
Property, Plant and Equipment, Net [Abstract]
Property, Plant and Equipment, Estimated Useful Lives			5 years
Software [Member] | Maximum [Member]
Property, Plant and Equipment, Net [Abstract]
Property, Plant and Equipment, Estimated Useful Lives			6 years
Provision For Returns [Member]
Accounts Receivable, net [Line Items]
Accounts Receivable Reserves	(8,438,000)		(8,438,000)		(7,613,000)
Provision For Promotions, Rebates And Other [Member]
Accounts Receivable, net [Line Items]
Accounts Receivable Reserves	(14,053,000)		(14,053,000)		(12,756,000)
Provision For Doubtful Accounts And Sales Allowances [Member]
Accounts Receivable, net [Line Items]
Accounts Receivable Reserves	$ (486,000)		$ (486,000)		$ (1,093,000)