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Debt Facilities - Narrative (Details)
2 Months Ended 12 Months Ended
May 26, 2023
Dec. 15, 2022
USD ($)
Jan. 31, 2020
USD ($)
Jan. 24, 2020
USD ($)
Dec. 15, 2022
Sep. 30, 2023
USD ($)
extension
Sep. 30, 2022
USD ($)
Sep. 30, 2021
USD ($)
Debt Instrument [Line Items]                
Repayments of Long-Term Debt           $ 350,000,000 $ 20,000,000 $ 20,000,000
Term Loan Facility [Member]                
Debt Instrument [Line Items]                
Aggregate Principal Amount       $ 400,000,000        
Redemption Percentage       1.25%        
Debt Issuance Costs       $ 2,200,000     200,000  
Repayments of Long-Term Debt   $ 350,000,000            
Interest Expense, Long-Term Debt   $ 3,000,000            
Line of Credit Facility, Interest Rate During Period         4.072%      
Long-term Debt             $ 350,000,000  
Interest Rate at Period End             2.19% 1.361%
Term Loan Facility [Member] | Minimum                
Debt Instrument [Line Items]                
Basis Spread on Variable Rate       1.125%        
Term Loan Facility [Member] | Maximum                
Debt Instrument [Line Items]                
Basis Spread on Variable Rate       1.75%        
Revolving Credit Facility [Member]                
Debt Instrument [Line Items]                
Aggregate Principal Amount     $ 350,000,000          
Conditional Increase In Borrowing Capacity     $ 150,000,000          
Number Of Extensions | extension           2    
Length Of Extension Period           1 year    
Long-term Line of Credit           $ 0    
Outstanding Line of Credit Balance           $ 350,000,000    
Debt Instrument, Interest Rate, Basis for Effective Rate 0.10              
Revolving Credit Facility [Member] | Minimum                
Debt Instrument [Line Items]                
Basis Spread on Variable Rate 1.125%   1.125%          
Commitment Fee Percentage     0.125%          
Revolving Credit Facility [Member] | Maximum                
Debt Instrument [Line Items]                
Basis Spread on Variable Rate 1.75%   1.75%          
Commitment Fee Percentage     0.30%          
Revolving Credit Facility [Member] | Alternate Base Rate [Member] | Minimum                
Debt Instrument [Line Items]                
Basis Spread on Variable Rate 0.125%   0.125%          
Revolving Credit Facility [Member] | Alternate Base Rate [Member] | Maximum                
Debt Instrument [Line Items]                
Basis Spread on Variable Rate 0.75%   0.75%