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Merger-related costs (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Oct. 30, 2010
Oct. 29, 2011
Oct. 30, 2010
Business Acquisition [Line Items]      
Merger-related costs $ 787 $ 885 $ 27,650
Investment banking
     
Business Acquisition [Line Items]      
Merger-related costs     14,255
Accounting and legal
     
Business Acquisition [Line Items]      
Merger-related costs (431)   6,219
Financing incentive compensation
     
Business Acquisition [Line Items]      
Merger-related costs 1,210 885 5,638
Other costs
     
Business Acquisition [Line Items]      
Merger-related costs $ 8   $ 1,538