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 6 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Mar. 31, 2024
Mar. 31, 2023
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]        
Beginning balance $ 1,717,806 $ 1,581,007 $ 1,667,835 $ 1,549,371
Other comprehensive income before reclassifications     3,480  
Amounts reclassified from accumulated other comprehensive loss     (6,014)  
Net current period other comprehensive losses 439 (3,597) (2,534) 658
Ending balance 1,789,143 1,601,722 1,789,143 1,601,722
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     3,534  
Amounts reclassified from accumulated other comprehensive loss     133  
Net current period other comprehensive losses     3,667  
Ending balance (46,817)   (46,817)  
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     (54)  
Amounts reclassified from accumulated other comprehensive loss     (6,147)  
Net current period other comprehensive losses     (6,201)  
Ending balance 16,668   16,668  
Accumulated Other Comprehensive Loss        
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]        
Beginning balance (30,588) (29,706) (27,615) (33,961)
Net current period other comprehensive losses     (2,534)  
Ending balance $ (30,149) $ (33,303) $ (30,149) $ (33,303)