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Earnings per share - Additional Information (Detail)	12 Months Ended
Earnings per share - Additional Information (Detail)	Feb. 01, 2014	Feb. 02, 2013	Jan. 28, 2012
Nonparticipating Option Securities [Member]
Earnings Per Share Disclosure [Line Items]
Securities excluded from the computations of earnings per share	563,480	1,381,750	2,028,204
Nonparticipating Performance Based Restricted Units Securities [Member]
Earnings Per Share Disclosure [Line Items]
Securities excluded from the computations of earnings per share	0	11,918	14,125

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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