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Debt Facilities - Narrative (Details)
3 Months Ended 6 Months Ended
Jan. 31, 2020
USD ($)
Jan. 24, 2020
USD ($)
Mar. 31, 2022
USD ($)
Mar. 31, 2021
Mar. 31, 2022
USD ($)
extension
Mar. 31, 2021
Term Loan Facility            
Debt Instrument [Line Items]            
Aggregate principal amount   $ 400,000,000        
Debt issuance costs   $ 2,200,000 $ 600,000   $ 600,000  
Redemption percentage   1.25%        
Long-term line of credit     $ 360,000,000   $ 360,000,000  
Line of Credit Facility, Interest Rate During Period     1.282% 1.39% 1.282% 1.39%
Term Loan Facility | London Interbank Offered Rate (LIBOR)            
Debt Instrument [Line Items]            
Basis spread on variable rate         1.125%  
Term Loan Facility | London Interbank Offered Rate (LIBOR) | Minimum            
Debt Instrument [Line Items]            
Basis spread on variable rate   1.125%        
Term Loan Facility | London Interbank Offered Rate (LIBOR) | Maximum            
Debt Instrument [Line Items]            
Basis spread on variable rate   1.75%        
Term Loan Facility | Alternate Base Rate            
Debt Instrument [Line Items]            
Basis spread on variable rate         0.125%  
Term Loan Facility | Alternate Base Rate | Minimum            
Debt Instrument [Line Items]            
Basis spread on variable rate   0.125%        
Term Loan Facility | Alternate Base Rate | Maximum            
Debt Instrument [Line Items]            
Basis spread on variable rate   0.75%        
Revolving Credit Facility            
Debt Instrument [Line Items]            
Aggregate principal amount $ 350,000,000          
Long-term line of credit     $ 0   $ 0  
Conditional increase in borrowing capacity $ 150,000,000          
Number of extensions | extension         2  
Length of extension period         1 year  
Outstanding line of credit balance     $ 350,000,000   $ 350,000,000  
Revolving Credit Facility | Minimum            
Debt Instrument [Line Items]            
Commitment fee percentage 0.125%          
Revolving Credit Facility | Maximum            
Debt Instrument [Line Items]            
Commitment fee percentage 0.30%          
Revolving Credit Facility | London Interbank Offered Rate (LIBOR) | Minimum            
Debt Instrument [Line Items]            
Basis spread on variable rate 1.125%          
Revolving Credit Facility | London Interbank Offered Rate (LIBOR) | Maximum            
Debt Instrument [Line Items]            
Basis spread on variable rate 1.75%          
Revolving Credit Facility | Alternate Base Rate | Minimum            
Debt Instrument [Line Items]            
Basis spread on variable rate 0.125%          
Revolving Credit Facility | Alternate Base Rate | Maximum            
Debt Instrument [Line Items]            
Basis spread on variable rate 0.75%