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Debt (Details) (USD $)
In Thousands, unless otherwise specified
0 Months Ended 0 Months Ended 0 Months Ended 3 Months Ended 0 Months Ended
Jan. 02, 2014
Jul. 25, 2014
Apr. 25, 2014
Jul. 26, 2013
Jul. 25, 2014
Standby Letters of Credit
Jan. 02, 2014
LIBOR
Jan. 02, 2014
Base Rate
Jan. 02, 2014
Federal Funds Rate
Jul. 25, 2014
Research and Development Investment Loan
Jul. 25, 2014
Research and Development Investment Loan
Minimum
Jan. 02, 2014
First Amendment to the Credit Agreement
Line of Credit
Line of Credit Facility [Line Items]                      
Revolving Credit Facility, Maximum Borrowing Capacity $ 750,000                    
Revolving Credit Facility 750,000       11,024            
Line of Credit Facility, Amount Outstanding 50,000                    
Accordion Option 1,050,000                    
Credit Facility Variable Rate Low End           0.00% 0.00%        
Credit Facility Variable Rate High End           2.75% 1.75%        
Debt Instrument, Basis Spread on Variable Rate           1.00%   0.50%      
Credit Facility Unused Capacity Commitment Fee Percentage Low End Of Range 0.15%                    
Credit Facility Unused Capacity Commitment Fee Percentage High End Of Range 0.25%                    
Financing costs 2,064                    
Unamortized debt financing cost 760                   1,279
Debt financing cost amortization period 5 years                   24 months
Coverage ratio requirement   3.00                  
Leverage ratio requirement   4.50                  
Current coverage ratio   20.89                  
Current leverage ratio   3.69                  
Effective Interest Rate   1.66%   1.47%              
Credit facility borrowings   458,836 458,898                
Impact of change in effective interest rate   4,652                  
Loans Payable                 $ 3,000    
Interest-free-loan period                 7 years    
Variable interest rate                   2.00%