DETAILS OF CERTAIN BALANCE SHEET ACCOUNTS (Details) (USD $)	12 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Mar. 31, 2010
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts Receivable	$ 133,233,000	$ 125,137,000
Accounts receivable, net	111,771,000	103,289,000
Inventory, net [Abstract]
Raw materials	14,062,000	15,315,000
Work in process	2,740,000	2,558,000
Finished goods	36,911,000	38,600,000
Inventory, Net	53,713,000	56,473,000
Accrued Liabilities [Abstract]
Employee compensation and benefits	24,458,000	27,478,000
Warranty obligation	13,346,000	11,016,000
Accrued advertising and sales and marketing	1,317,000	2,873,000
Accrued other	12,946,000	18,240,000
Accrued liabilities	52,067,000	59,607,000
Movement in Standard Product Warranty Accrual [Roll Forward]
Warranty obligation at March 31, 2011	11,016,000	11,006,000
Warranty provision relating to products shipped	17,061,000	14,769,000
Deductions for warranty claims processed	(14,731,000)	(14,759,000)
Warranty obligation at March 31, 2012	13,346,000	11,016,000	11,006,000
Property, Plant and Equipment, Net [Abstract]
Land	6,531,000	5,867,000
Buildings and Improvements	67,417,000	55,256,000
Machinery and Equipment	90,643,000	87,001,000
Software	28,951,000	27,096,000
Construction in Progress	2,323,000	8,556,000
Property, Plant and Equipment, Gross	195,865,000	183,776,000
Accumulated Depreciation and Amortization	(119,706,000)	(113,154,000)
Property, plant and equipment, net	76,159,000	70,622,000
Depreciation and Amortization Expense	13,300,000	13,700,000	16,400,000
Accelerated Depreciation Expense			5,200,000
Unamortized Capitalized Computer Software Costs	6,700,000	7,400,000
Amortization Expense Related to Capitalized Software Costs	3,100,000	3,100,000	3,000,000
Provision For Returns [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts Receivable Reserves	(7,613,000)	(10,437,000)
Provision For Promotions, Rebates And Other [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts Receivable Reserves	(12,756,000)	(10,460,000)
Provision For Doubtful Accounts And Sales Allowances [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts Receivable Reserves	$ (1,093,000)	$ (951,000)
Buildings and improvements
Property, Plant and Equipment, Net [Abstract]
Property, Plant and Equipment, Useful Life, Minimum	7
Property, Plant and Equipment, Useful Life, Maximum	30
Machinery and equipment
Property, Plant and Equipment, Net [Abstract]
Property, Plant and Equipment, Useful Life, Minimum	2
Property, Plant and Equipment, Useful Life, Maximum	10
Software
Property, Plant and Equipment, Net [Abstract]
Property, Plant and Equipment, Useful Life, Minimum	5
Property, Plant and Equipment, Useful Life, Maximum	6