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Credit Facility - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
0 Months Ended 6 Months Ended
Nov. 01, 2014
Oct. 26, 2013
Apr. 29, 2011
Amended Credit Agreement
Nov. 01, 2014
Amended Credit Agreement
Apr. 29, 2011
Amended Credit Agreement
Line of Credit Facility [Line Items]          
Credit facility, borrowing capacity         $ 1,000,000
Credit facility maturity term, in years     5 years    
Option to increase in commitments under credit agreement, maximum     300,000    
Credit facility, expiration date       Apr. 29, 2016  
Percentage of Loan Cap under Amended Credit Agreement     10.00%    
Amount of Loan Cap under Amended Credit Agreement     50,000    
Line of credit facility, amount outstanding 64,000 105,000      
Letters of credit, outstanding amount $ 66,859 $ 34,485