COMPUTATION OF EARNINGS PER COMMON SHARE (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Jul. 28, 2012	Apr. 28, 2012	Jan. 28, 2012	Oct. 29, 2011	Jul. 30, 2011	Apr. 30, 2011	Jan. 29, 2011	Oct. 30, 2010	Jul. 28, 2012	Jul. 30, 2011	Jul. 31, 2010
Basic earnings per unit
Net income	$ 13,282	$ 9,645	$ 3,485	$ 12,966	$ 12,965	$ 1,489	$ (5,094)	$ 6,747	$ 39,378	$ 16,107	$ 5,849
Weighted-average number of common shares (in shares)									33,653,055	35,306,900	38,931,029
Basic earnings per common share (in dollars per share)	$ 0.40	$ 0.29	$ 0.10	$ 0.39	$ 0.38	$ 0.04	$ (0.14)	$ 0.18	$ 1.17	$ 0.46	$ 0.15
Diluted earnings per unit
Weighted-average number of common shares (in shares)									33,653,055	35,306,900	38,931,029
Potential common stock arising from stock options, and unvested restricted share units (in shares)									828,840	447,268	65,837
Total shares-diluted (in shares)									34,481,895	35,754,168	38,996,866
Diluted earnings per common share (in dollars per share)	$ 0.39	$ 0.28	$ 0.10	$ 0.38	$ 0.38	$ 0.04	$ (0.14)	$ 0.18	$ 1.14	$ 0.45	$ 0.15
Anti-dilutive weighted shares excluded from the calculation of earnings per share (in shares)									1,262,964	2,071,254	2,647,975