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Current and long-term obligations (Details) - USD ($)
$ in Thousands
9 Months Ended
Apr. 27, 2017
Nov. 03, 2017
Apr. 11, 2017
Feb. 22, 2017
Feb. 03, 2017
Current and long-term obligations          
Debt issuance costs, net   $ (17,334)     $ (14,094)
Current and long-term obligations   3,121,100     3,211,526
Less: current portion   (401,532)     (500,950)
Long-term obligations   2,719,568     2,710,576
Loss on debt retirement   $ 3,502      
Senior unsecured credit facility          
Current and long-term obligations          
Commitment fee rate   0.15%      
Weighted average interest rate (as a percent)   2.30%      
Senior unsecured credit facility | LIBOR loans          
Current and long-term obligations          
Variable rate basis   LIBOR      
Spread on variable rate (as a percent)   1.10%      
Senior unsecured credit facility | Base-rate loans          
Current and long-term obligations          
Variable rate basis   base rate      
Spread on variable rate (as a percent)   0.10%      
Senior unsecured credit facility, Term Facility          
Current and long-term obligations          
Current and long-term obligations   $ 175,000     425,000
Amount borrowed       $ 175,000  
Senior unsecured credit facility, Revolving Facility          
Current and long-term obligations          
Current and long-term obligations   0      
Maximum financing under credit agreements   1,250,000   1,250,000  
Borrowing availability under credit facility   1,240,000      
Borrowing availability except for amount reserved for commercial paper program   690,600      
Senior unsecured credit facility, Revolving Facility | Letters of credit          
Current and long-term obligations          
Maximum financing under credit agreements   175,000   $ 175,000  
Letters of credit outstanding   $ 9,500      
4.125% Senior Notes due July 15, 2017          
Current and long-term obligations          
Current and long-term obligations         $ 500,000
Stated interest rate (as a percent)   4.125%     4.125%
Loss on debt retirement   $ 3,400      
Principal amount of notes redeemed $ 500,000        
1.875% Senior Notes due April 15, 2018          
Current and long-term obligations          
Current and long-term obligations   399,960     $ 399,889
Discount on debt issuance   $ 40     $ 111
Stated interest rate (as a percent)   1.875%     1.875%
3.25% Senior Notes due April 15, 2023          
Current and long-term obligations          
Current and long-term obligations   $ 898,620     $ 898,448
Discount on debt issuance   $ 1,380     $ 1,552
Stated interest rate (as a percent)   3.25%     3.25%
4.150% Senior Notes due Nov 1, 2025          
Current and long-term obligations          
Current and long-term obligations   $ 499,351     $ 499,300
Discount on debt issuance   $ 649     $ 700
Stated interest rate (as a percent)   4.15%     4.15%
3.875% Senior Notes due April 15. 2027          
Current and long-term obligations          
Current and long-term obligations   $ 599,577      
Discount on debt issuance   $ 423 $ 400    
Debt issue costs     5,200    
Amount borrowed     $ 600,000    
Stated interest rate (as a percent)   3.875% 3.875%    
Unsecured commercial paper notes          
Current and long-term obligations          
Long-term obligations   $ 549,900     $ 490,500
Maximum maturity   364 days      
Maximum aggregate borrowing amount   $ 1,000,000      
Weighted average interest rate (as a percent)   1.40%      
Capital lease obligations          
Current and long-term obligations          
Current and long-term obligations   $ 8,261     3,643
Tax increment financing due February 1, 2035          
Current and long-term obligations          
Current and long-term obligations   7,765     $ 8,840
Letter Of Credit Outside Of Revolving Facility          
Current and long-term obligations          
Letters of credit outstanding   $ 40,000