SUPPLEMENTARY QUARTERLY FINANCIAL DATA (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2014
Quarterly Financial Information Disclosure [Abstract]
Duration of fiscal year									371 days	364 days	364 days
Net revenues	$ 209,797	$ 225,735	$ 215,017	$ 206,358	$ 200,762	$ 231,781	$ 215,805	$ 216,662	$ 856,907	$ 865,010	$ 818,607
Gross Profit	106,830	109,516	110,970	107,358	109,166	119,916	117,827	114,710	434,674	461,619	426,628
Net income	$ 12,980	$ 16,288	$ 17,896	$ 21,228	$ 25,824	$ 30,384	$ 27,421	$ 28,672	$ 68,392	$ 112,301	$ 112,417
Basic net income per common share (in dollars per share)	$ 0.40	$ 0.50	$ 0.53	$ 0.56	$ 0.62	$ 0.73	$ 0.66	$ 0.69	$ 2.00	$ 2.69	$ 2.65
Diluted net income per common share (in dollars per share)	0.39	0.49	0.52	0.55	0.61	0.71	0.65	0.68	1.96	2.63	2.59
Cash dividends declared per common share (in dollars per share)	$ 0.15	$ 0.15	$ 0.15	$ 0.15	$ 0.15	$ 0.15	$ 0.15	$ 0.15	$ 0.60	$ 0.60	$ 0.40