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Credit Facility - Additional Information (Detail) - USD ($)
3 Months Ended
Aug. 03, 2015
Apr. 29, 2011
Oct. 31, 2016
Aug. 01, 2015
Jul. 30, 2016
Line of Credit Facility [Line Items]          
Line of credit facility, amount outstanding       $ 0 $ 64,600,000
Letters of credit, outstanding amount       $ 51,351,000 $ 38,895,000
Amended Credit Agreement          
Line of Credit Facility [Line Items]          
Credit facility, borrowing capacity   $ 1,000,000,000      
Credit facility maturity term, in years   5 years      
Credit facility, expiration date       Apr. 29, 2016  
Amended Credit Agreement | Scenario, Forecast          
Line of Credit Facility [Line Items]          
Write off of deferred financing fees     $ 460,000    
Unamortized deferred financing fees     3,542,000    
New Credit Facility          
Line of Credit Facility [Line Items]          
Credit facility, borrowing capacity $ 700,000,000        
Credit facility maturity term, in years 5 years        
New Credit Facility | London Interbank Offered Rate (LIBOR)          
Line of Credit Facility [Line Items]          
Debt instrument, percentage points added to reference rate 1.75%        
New Credit Facility | Base Rate          
Line of Credit Facility [Line Items]          
Debt instrument, percentage points added to reference rate 0.75%        
New Credit Facility | Scenario, Forecast          
Line of Credit Facility [Line Items]          
Unamortized deferred financing fees     $ 5,701,000    
Amortization period for deferred financing fees     5 years    
New Credit Facility | Maximum          
Line of Credit Facility [Line Items]          
Option to increase in commitments under credit agreement $ 250,000,000        
New Credit Facility | Maximum | London Interbank Offered Rate (LIBOR)          
Line of Credit Facility [Line Items]          
Debt instrument, percentage points added to reference rate 2.00%        
New Credit Facility | Maximum | Base Rate          
Line of Credit Facility [Line Items]          
Debt instrument, percentage points added to reference rate 1.00%        
New Credit Facility | Minimum | London Interbank Offered Rate (LIBOR)          
Line of Credit Facility [Line Items]          
Debt instrument, percentage points added to reference rate 1.50%        
New Credit Facility | Minimum | Base Rate          
Line of Credit Facility [Line Items]          
Debt instrument, percentage points added to reference rate 0.50%