DETAILS OF CERTAIN BALANCE SHEET ACCOUNTS (Details) (USD $)	12 Months Ended																3 Months Ended
	Mar. 31, 2014		Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2014 Buildings and improvements Minimum	Mar. 31, 2014 Buildings and improvements Maximum	Mar. 31, 2014 Machinery and equipment Minimum	Mar. 31, 2014 Machinery and equipment Maximum	Mar. 31, 2014 Software Minimum	Mar. 31, 2014 Software Maximum	Mar. 31, 2014 Provision For Returns	Mar. 31, 2013 Provision For Returns	Mar. 31, 2014 Provision for promotions and rebates	Mar. 31, 2013 Provision for promotions and rebates	Mar. 31, 2014 Provision for doubtful accounts and sales allowances	Mar. 31, 2013 Provision for doubtful accounts and sales allowances	Dec. 31, 2013 Error Related to Estimated Warranty Obligation and Return Material Authorization Cost of revenues	Dec. 31, 2013 Error Related to Estimated Warranty Obligation and Return Material Authorization Net income
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts Receivable	$ 159,592,000		$ 151,250,000
Accounts Receivable Reserves											(6,201,000)	(8,957,000)	(14,803,000)	(13,675,000)	(287,000)	(409,000)
Accounts receivable, net	138,301,000		128,209,000
Inventory, net [Abstract]
Raw materials	28,071,000		28,743,000
Work in process	985,000		82,000
Finished goods	28,076,000		38,610,000
Inventory, Net	57,132,000		67,435,000
Property, Plant and Equipment, Net [Abstract]
Land	14,170,000		13,961,000
Buildings and Improvements	94,299,000		72,263,000
Machinery and Equipment	97,520,000		88,538,000
Software	30,368,000		30,538,000
Construction in Progress	24,927,000		16,101,000
Property, Plant and Equipment, Gross	261,284,000		221,401,000
Accumulated Depreciation and Amortization	(126,882,000)		(122,290,000)
Property, plant, and equipment, net	134,402,000		99,111,000
Useful life					7 years	30 years	2 years	10 years	5 years	6 years
Depreciation and amortization expense	15,500,000		15,800,000	13,300,000
Unamortized capitalized software costs	5,100,000		6,100,000
Amortization expense related to capitalized software costs	2,300,000		2,900,000	3,100,000
Accrued Liabilities [Abstract]
Employee compensation and benefits	32,280,000		29,796,000
Warranty obligation	7,965,000		13,410,000
Incomes taxes payable	3,092,000		3,376,000
Accrued other	23,514,000		19,837,000
Accrued liabilities	66,851,000		66,419,000
Movement in Standard Product Warranty Accrual [Roll Forward]
Warranty obligation at beginning of year	13,410,000		13,346,000
Correction of immaterial prior period error	(5,042,000)	[1]	0
Warranty provision relating to products shipped during the year	5,158,000		16,287,000
Deductions for warranty claims processed	(5,561,000)		(16,223,000)
Warranty obligation at end of year	7,965,000		13,410,000	13,346,000
Estimated warranty obligation correction, increase (decrease)																	$ (2,400,000)	$ 2,100,000

[1] During the third quarter of fiscal year 2014, the Company identified immaterial out of period errors related to its estimated warranty obligation and return material authorization ("RMA") reserves, the correction of which decreased its cost of revenues by approximately $2.4 million and increased net income by approximately $2.1 million. The Company recorded these corrections in the quarter ended December 31, 2013 because the errors were not material, either individually or in the aggregate, to any of the prior reporting periods. In addition, these adjustments are not material for the fiscal year ending March 31, 2014, either individually or in the aggregate.