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Long-Term Debt (Details) - USD ($)
9 Months Ended
Oct. 21, 2019
Jun. 30, 2020
Jun. 30, 2019
Sep. 30, 2019
Debt Instrument        
Long-term and short-term debt, combined amount   $ 737,500,000    
Current portion of long-term debt   (35,000,000.0)   $ 0
Unamortized debt issuance expense   (7,100,000)    
Unamortized debt discount $ (14,000,000.0) (11,500,000)    
Long-term debt   683,900,000    
Payments of Debt Issuance Costs 9,600,000 9,600,000 $ 0  
Proceeds from debt, net of discount and issuance costs 776,400,000      
Bridge Loan        
Debt Instrument        
Proceeds from issuance of long-term debt   1,225,000,000.0    
Interest costs incurred   2,200,000    
Repayments of Debt   1,225,000,000.0    
Term Loan        
Debt Instrument        
Long-term debt, gross 700,000,000.0 682,500,000    
Periodic payment of long-term debt principal   8,750,000    
Letter of Credit        
Debt Instrument        
Maximum borrowing capacity on line of credit   20,000,000.0    
Revolving Credit Facility        
Debt Instrument        
Long-term debt, gross   55,000,000.0    
Maximum borrowing capacity on line of credit   200,000,000.0    
Proceeds from borrowing under line of credit 100,000,000.0 185,000,000.0    
Repayments of lines of credit $ 20,000,000.0 130,000,000.0    
Remaining borrowing capacity on line of credit   145,000,000.0    
Letters of credit outstanding, amount   0    
Debt covenant, maximum undischarged judgments   $ 65,000,000.0