Earnings per share - Reconciliations of Basic and Diluted Share Calculations (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Feb. 01, 2014	Nov. 02, 2013	Aug. 03, 2013	May 04, 2013	Feb. 02, 2013	Oct. 27, 2012	Jul. 28, 2012	Apr. 28, 2012	Feb. 01, 2014	Feb. 02, 2013	Jan. 28, 2012
Earnings Per Share Disclosure [Line Items]
Net income	$ 4,680	$ 41,189	$ 35,649	$ 20,912	$ 2,370	$ 40,748	$ 30,735	$ 28,732	$ 102,430	$ 102,585	$ 86,566
Weighted Average Number of Shares Outstanding, Diluted
Weighted average shares outstanding									45,490	47,494	51,200
Weighted average shares outstanding assuming dilution									45,955	48,094	52,029
Basic Earnings per Share
Basic earnings per share	$ 0.10	$ 0.90	$ 0.76	$ 0.45	$ 0.05	$ 0.85	$ 0.64	$ 0.59	$ 2.21	$ 2.13	$ 1.66
Diluted Earnings per Share
Diluted earnings per share	$ 0.10	$ 0.89	$ 0.76	$ 0.44	$ 0.05	$ 0.84	$ 0.63	$ 0.58	$ 2.19	$ 2.10	$ 1.64
Earnings Per Share, Basic. [Member]
Earnings Per Share Disclosure [Line Items]
Net income									102,430	102,585	86,566
Less net income associated with participating securities									1,983	1,470	1,455
Net Income Available to Common Stockholders, Basic									100,447	101,115	85,111
Weighted Average Number of Shares Outstanding, Diluted
Weighted average shares outstanding									45,490	47,494	51,200
Basic Earnings per Share
Basic earnings per share									$ 2.21	$ 2.13	$ 1.66
Earnings Per Share, Diluted. [Member]
Earnings Per Share Disclosure [Line Items]
Net income									102,430	102,585	86,566
Less net income associated with participating securities									1,963	1,452	1,432
Net Income Available to Common Stockholders, Diluted									$ 100,467	$ 101,133	$ 85,134
Weighted Average Number of Shares Outstanding, Diluted
Effect of dilutive securities									465	600	829
Weighted average shares outstanding assuming dilution									45,955	48,094	52,029
Diluted Earnings per Share
Diluted earnings per share									$ 2.19	$ 2.10	$ 1.64