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Long-Term Debt - Additional Information (Details)
$ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended 9 Months Ended 15 Months Ended
Apr. 30, 2020
USD ($)
Mar. 31, 2022
Dec. 31, 2021
Sep. 30, 2020
USD ($)
Jun. 30, 2020
Sep. 30, 2019
USD ($)
Jun. 30, 2020
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2021
Debt Instrument [Line Items]                    
Proceeds from borrowings of credit agreements               $ 452,163 $ 0  
Net investment hedge (losses) gains       $ (12,408)   $ 12,745   $ (16,083) $ 13,012  
Commercial paper notes                    
Debt Instrument [Line Items]                    
Weighted average interest rate       0.55%       0.55%    
Debt instrument maturity period               46 days    
1.875% Senior Notes                    
Debt Instrument [Line Items]                    
Debt instrument, interest rate       1.875%       1.875%    
2018 Credit Agreement                    
Debt Instrument [Line Items]                    
Proceeds from borrowings of credit agreements             $ 250,000      
2019 Credit Agreement                    
Debt Instrument [Line Items]                    
Proceeds from borrowings of credit agreements $ 200,000                  
Interest rate on amount borrowed 1.375%                  
Credit facilities                    
Debt Instrument [Line Items]                    
Debt covenant ratio, maximum debt to EBITDA         4.00          
Priority debt basket       0.24       0.24    
Basis point fee       0.0010       0.0010    
Credit facilities | Forecast                    
Debt Instrument [Line Items]                    
Debt covenant ratio, maximum debt to EBITDA   3.50 4.00             4.50