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Debt Credit Agreement (Details)
 3 Months Ended 12 Months Ended
Apr. 24, 2015
USD ($)
Jan. 23, 2016
Oct. 24, 2015
USD ($)
Jul. 25, 2015
USD ($)
Line of Credit Facility [Line Items]        
Debt Instrument, Face Amount     $ 485,000,000  
Debt and capital lease obligations     $ 641,634,000 $ 525,591,000
Credit Agreement        
Line of Credit Facility [Line Items]        
Debt covenant compliance, consolidated leverage maximum (ratio)     3.50  
Debt Instrument, Covenant Compliance, Consolidated Interest Coverage Ratio, Maximum     3.00  
Credit Agreement - Term Loan (matures April 2020)        
Line of Credit Facility [Line Items]        
Debt Instrument, Face Amount $ 150,000,000      
Debt covenant compliance, consolidated leverage maximum (ratio)       2.25
Debt and capital lease obligations     $ 150,000,000 $ 150,000,000
Debt Instrument, Interest Rate, Effective Percentage     1.95% 1.94%
Credit Agreement - Revolving facility (matures April 2020)        
Line of Credit Facility [Line Items]        
Line of credit current borrowing capacity 450,000,000      
Additional borrowing availability     $ 260,800,000 $ 300,300,000
Unutilized commitment fee (in percent)     0.35%  
Debt and capital lease obligations     $ 131,250,000 $ 95,250,000
Debt Instrument, Interest Rate, Effective Percentage     2.10% 2.02%
Standby Letters of Credit        
Line of Credit Facility [Line Items]        
Line of credit current borrowing capacity $ 200,000,000      
Unutilized commitment fee (in percent)     1.75%  
Letters of credit outstanding amount     $ 58,000,000 $ 54,400,000
Eurodollar [Member] | Credit Agreement        
Line of Credit Facility [Line Items]        
Debt Instrument, Basis Spread on Variable Rate 1.00%   1.75%  
Administrative Agent Base Rate [Member] | Credit Agreement        
Line of Credit Facility [Line Items]        
Debt Instrument, Basis Spread on Variable Rate     0.75%  
Minimum | Credit Agreement - Revolving facility (matures April 2020)        
Line of Credit Facility [Line Items]        
Unutilized commitment fee (in percent)     0.25%  
Minimum | Standby Letters of Credit        
Line of Credit Facility [Line Items]        
Unutilized commitment fee (in percent)     1.25%  
Minimum | Commercial Letters of Credit [Member]        
Line of Credit Facility [Line Items]        
Unutilized commitment fee (in percent)     0.625%  
Maximum | Credit Agreement - Revolving facility (matures April 2020)        
Line of Credit Facility [Line Items]        
Unutilized commitment fee (in percent)     0.40%  
Maximum | Standby Letters of Credit        
Line of Credit Facility [Line Items]        
Unutilized commitment fee (in percent)     2.00%  
Maximum | Commercial Letters of Credit [Member]        
Line of Credit Facility [Line Items]        
Unutilized commitment fee (in percent)     1.00%  
Scenario, Forecast | Eurodollar [Member] | Credit Agreement        
Line of Credit Facility [Line Items]        
Debt Instrument, Basis Spread on Variable Rate   2.00%    
Scenario, Forecast | Administrative Agent Base Rate [Member] | Credit Agreement        
Line of Credit Facility [Line Items]        
Debt Instrument, Basis Spread on Variable Rate   1.00%