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Debt - Senior Credit Agreement (Details)
 3 Months Ended 6 Months Ended 9 Months Ended
Sep. 15, 2015
USD ($)
Jul. 31, 2021
USD ($)
Jul. 31, 2021
USD ($)
Oct. 24, 2020
Apr. 01, 2021
USD ($)
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 $ 46,300,000     $ 52,200,000    
Additional borrowing availability   273,900,000 273,900,000     558,700,000    
Standby Letters of Credit                
Line of Credit Facility [Line Items]                
Line of credit maximum borrowing capacity         $ 200,000,000      
Incremental Facility, Minimum                
Line of Credit Facility [Line Items]                
Debt instrument, face amount $ 350,000,000              
Swingline Loans                
Line of Credit Facility [Line Items]                
Line of credit maximum borrowing capacity         50,000,000      
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
Debt instrument, covenant compliance, consolidated leverage ratio, maximum 2.25              
Unrestricted cash and cash equivalents threshold   $ 25,000,000 $ 25,000,000          
Credit Agreement - Revolving facility (matures April 2020)                
Line of Credit Facility [Line Items]                
Line of credit maximum borrowing capacity $ 750,000,000             $ 650,000,000
Unutilized commitment fee (in percent)     0.35% 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 $ 58,264,000 $ 58,264,000     $ 58,264,000 $ 460,000,000