Selected Quarterly Financial Data - Additional Information (Detail) (USD $)
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3 Months Ended | 12 Months Ended | 3 Months Ended | ||||
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Jan. 31, 2015
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May 03, 2014
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Aug. 03, 2013
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Jan. 31, 2015
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Feb. 01, 2014
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Feb. 02, 2013
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May 04, 2013
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Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |||||||
Litigation charge | $ 9,200,000 | $ 9,500,000 | |||||
Reversal of estimated expenses | 1,500,000 | ||||||
Non-cash compensation charge | 17,072,000 | 67,622,000 | 116,183,000 | ||||
Cost incurred in connection with follow-on offerings | 2,100,000 | ||||||
Performance-based Vesting Shares [Member] | |||||||
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |||||||
Non-cash compensation charge | 26,200,000 | 800,000 | 3,300,000 | ||||
Cost incurred in connection with follow-on offerings | 800,000 | ||||||
Options Granted [Member] | |||||||
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |||||||
Non-cash compensation charge | $ 33,700,000 |