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Indebtedness (Details)
Aug. 30, 2019
USD ($)
Sep. 30, 2015
USD ($)
Jul. 31, 2019
USD ($)
Prior Credit Agreement | Line of Credit | Secured Revolving Credit Facility      
Debt Instrument [Line Items]      
Credit facility, amount   $ 100,000,000.0  
Facility term   5 years  
Long-term Line of Credit     $ 0
Prior Credit Agreement | Line of Credit | Secured Revolving Credit Facility | Minimum      
Debt Instrument [Line Items]      
Commitment fee percentage   0.20%  
Minimum interest coverage ratio   3.00  
Prior Credit Agreement | Line of Credit | Secured Revolving Credit Facility | Maximum      
Debt Instrument [Line Items]      
Maximum leverage ratio   3.00  
Prior Credit Agreement | Line of Credit | Secured Revolving Credit Facility | London Interbank Offered Rate (LIBOR) | Minimum      
Debt Instrument [Line Items]      
Variable rate borrowing spread   1.50%  
Prior Credit Agreement | Line of Credit | Secured Revolving Credit Facility | London Interbank Offered Rate (LIBOR) | Maximum      
Debt Instrument [Line Items]      
Variable rate borrowing spread   2.00%  
Prior Credit Agreement | Line of Credit | Secured Revolving Credit Facility | Customary Base Rate | Minimum      
Debt Instrument [Line Items]      
Variable rate borrowing spread   0.50%  
Prior Credit Agreement | Line of Credit | Secured Revolving Credit Facility | Customary Base Rate | Maximum      
Debt Instrument [Line Items]      
Variable rate borrowing spread   1.00%  
Credit Agreement | Line of Credit | Secured Revolving Credit Facility | Subsequent Event      
Debt Instrument [Line Items]      
Credit facility, amount $ 350,000,000    
Facility term 5 years    
Credit Agreement | Line of Credit | Line of Credit | Subsequent Event      
Debt Instrument [Line Items]      
Credit facility, amount $ 1,600,000,000    
Minimum interest coverage ratio 3.00    
Credit Agreement | Line of Credit | Line of Credit | London Interbank Offered Rate (LIBOR) | Minimum | Subsequent Event      
Debt Instrument [Line Items]      
Variable rate borrowing spread 1.25%    
Credit Agreement | Line of Credit | Line of Credit | London Interbank Offered Rate (LIBOR) | Maximum | Subsequent Event      
Debt Instrument [Line Items]      
Variable rate borrowing spread 2.25%    
Credit Agreement | Line of Credit | Line of Credit | Customary Base Rate | Minimum | Subsequent Event      
Debt Instrument [Line Items]      
Variable rate borrowing spread 0.25%    
Credit Agreement | Line of Credit | Line of Credit | Customary Base Rate | Maximum | Subsequent Event      
Debt Instrument [Line Items]      
Variable rate borrowing spread 1.25%    
Credit Agreement | Term Loan | Line of Credit | Subsequent Event      
Debt Instrument [Line Items]      
Credit facility, amount $ 1,250,000,000    
Facility term 5 years