Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements - Accumulated Other Comprehensive Loss (Details)

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Fair Value Measurements - Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]        
Beginning balance $ 1,789,143 $ 1,601,722 $ 1,667,835 $ 1,549,371
Other comprehensive income before reclassifications     5,806  
Amounts reclassified from accumulated other comprehensive loss     (9,125)  
Net current period other comprehensive losses (785) 8,992 (3,319) 9,650
Ending balance 1,818,715 1,632,853 1,818,715 1,632,853
Foreign currency translation adjustment        
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]        
Beginning balance     (50,484)  
Other comprehensive income before reclassifications     3,946  
Amounts reclassified from accumulated other comprehensive loss     133  
Net current period other comprehensive losses     4,079  
Ending balance (46,405)   (46,405)  
Foreign currency translation adjustment | Australia, Dollars        
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]        
Ending balance 18,900   18,900  
Net unrealized gain on derivatives, net of tax        
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]        
Beginning balance     22,869  
Other comprehensive income before reclassifications     1,860  
Amounts reclassified from accumulated other comprehensive loss     (9,258)  
Net current period other comprehensive losses     (7,398)  
Ending balance 15,471   15,471  
Accumulated Other Comprehensive Loss        
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]        
Beginning balance (30,149) (33,303) (27,615) (33,961)
Net current period other comprehensive losses     (3,319)  
Ending balance $ (30,934) $ (24,311) $ (30,934) $ (24,311)