SUPPLEMENTARY QUARTERLY FINANCIAL DATA (Details) (USD $)	3 Months Ended								12 Months Ended
	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Sep. 30, 2010	Jun. 30, 2010	Mar. 31, 2012	Mar. 31, 2011	Mar. 31, 2010
Number of Weeks in Fiscal Year									P52W	P52W	P53W
Net revenues	$ 177,584,000	$ 183,236,000	$ 176,948,000	$ 175,600,000	$ 173,077,000	$ 181,585,000	$ 158,255,000	$ 170,685,000	$ 713,368,000	$ 683,602,000	$ 613,837,000
Gross Profit	95,115,000	96,212,000	98,966,000	94,058,000	90,541,000	95,808,000	85,959,000	89,448,000	384,351,000	361,756,000	301,070,000
Net income	23,886,000	30,898,000	27,521,000	26,731,000	26,316,000	31,552,000	25,429,000	25,946,000	109,036,000	109,243,000	57,378,000
Earnings per Common Share - Basic	$ 0.57	$ 0.73	$ 0.62	$ 0.57	$ 0.55	$ 0.66	$ 0.54	$ 0.54	$ 2.48	$ 2.29	$ 1.18
Earnings per Common Share - Diluted	$ 0.55	$ 0.71	$ 0.60	$ 0.56	$ 0.53	$ 0.64	$ 0.52	$ 0.52	$ 2.41	$ 2.21	$ 1.16
Cash dividends declared per common share	$ 0.05	$ 0.05	$ 0.05	$ 0.05	$ 0.05	$ 0.05	$ 0.05	$ 0.05	$ 0.20	$ 0.20	$ 0.20
Gain related to litigation settlement					5,100,000				0	5,100,000	0
Accelerated Amortization Expense					$ 1,400,000