SUPPLEMENTARY QUARTERLY FINANCIAL DATA (Details) (USD $)	3 Months Ended									12 Months Ended
	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012		Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2012
Quarterly Financial Information Disclosure [Abstract]
Duration of fiscal year										364 days	364 days	364 days
Net revenues	$ 209,070,000	$ 212,739,000	$ 193,980,000	$ 202,818,000	$ 204,179,000	$ 197,402,000	[1]	$ 179,280,000	$ 181,365,000	$ 818,607,000	$ 762,226,000	$ 713,368,000
Gross Profit	111,055,000	110,327,000	99,614,000	105,632,000	106,093,000	102,164,000	[1]	97,228,000	97,696,000	426,628,000	403,181,000	384,351,000
Net income	27,943,000	34,383,000	23,138,000	26,953,000	28,709,000	28,206,000	[1]	25,924,000	23,563,000	112,417,000	106,402,000	109,036,000
Basic net income per common share (in dollars per share)	$ 0.67	$ 0.81	$ 0.54	$ 0.63	$ 0.68	$ 0.68	[1]	$ 0.62	$ 0.57	$ 2.65	$ 2.55	$ 2.48
Diluted net income per common share (in dollars per share)	$ 0.65	$ 0.80	$ 0.53	$ 0.62	$ 0.67	$ 0.66	[1]	$ 0.61	$ 0.55	$ 2.59	$ 2.49	$ 2.41
Cash dividends declared per common share (in dollars per share)	$ 0.10	$ 0.10	$ 0.10	$ 0.10	$ 0.10	$ 0.10	[1]	$ 0.10	$ 0.10	$ 0.40	$ 0.40	$ 0.20
Restructuring and other related charges incurred during fiscal year 2013											$ 1,900,000

[1] We initiated a restructuring plan during the third quarter of fiscal year 2013. Under the plan, we eliminated certain positions in the US., Mexico, China, and Europe, and transitioned some of these positions to lower cost locations. The pre-tax charges incurred during fiscal year 2013 included $1.9 million for severance and related benefits and an immaterial amount of accelerated amortization on leasehold assets with no alternative future use.