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Debt - Senior Credit Agreement (Details)
3 Months Ended 6 Months Ended
Sep. 15, 2015
USD ($)
May 01, 2021
USD ($)
Jul. 25, 2020
Apr. 01, 2021
USD ($)
Jan. 30, 2021
USD ($)
Jan. 25, 2020
USD ($)
Oct. 19, 2018
USD ($)
Line of Credit Facility [Line Items]              
Letters of credit outstanding amount   $ 46,300,000     $ 52,200,000    
Additional borrowing availability   452,100,000     558,700,000    
Standby Letters of Credit              
Line of Credit Facility [Line Items]              
Line of credit maximum borrowing capacity       $ 200,000,000.0      
Incremental Facility, Minimum              
Line of Credit Facility [Line Items]              
Debt instrument, face amount $ 350,000,000.0            
Swingline Loans              
Line of Credit Facility [Line Items]              
Line of credit maximum borrowing capacity       50,000,000.0      
Credit Agreement - Term Loan (matures April 2020)              
Line of Credit Facility [Line Items]              
Line of credit maximum borrowing capacity       $ 416,300,000     $ 350,000,000.0
Debt instrument, covenant compliance, consolidated leverage ratio, maximum 2.25            
Unrestricted cash and cash equivalents threshold   $ 25,000,000.0          
Credit Agreement - Revolving facility (matures April 2020)              
Line of Credit Facility [Line Items]              
Line of credit maximum borrowing capacity $ 750,000,000.0           $ 650,000,000.0
Unutilized commitment fee (in percent)   0.30% 0.25%        
Minimum              
Line of Credit Facility [Line Items]              
Debt instrument, covenant compliance, consolidated leverage ratio, maximum   3.50          
Debt instrument, covenant compliance, consolidated interest coverage ratio, maximum   3.00          
Minimum | Standby Letters of Credit              
Line of Credit Facility [Line Items]              
Unutilized commitment fee (in percent)   1.25%          
Minimum | Credit Agreement - Revolving facility (matures April 2020)              
Line of Credit Facility [Line Items]              
Unutilized commitment fee (in percent)   0.20%          
Maximum              
Line of Credit Facility [Line Items]              
Debt instrument, covenant compliance, consolidated leverage ratio, maximum   1.00          
Debt instrument, covenant compliance, consolidated interest coverage ratio, maximum   1.00          
Maximum | Standby Letters of Credit              
Line of Credit Facility [Line Items]              
Unutilized commitment fee (in percent)   2.00%          
Maximum | Credit Agreement - Revolving facility (matures April 2020)              
Line of Credit Facility [Line Items]              
Unutilized commitment fee (in percent)   0.40%          
0.75% Convertible Senior Notes Due 2021              
Line of Credit Facility [Line Items]              
Debt instrument, face amount $ 485,000,000.0 $ 58,264,000     $ 58,264,000 $ 460,000,000.0