Annual report pursuant to Section 13 and 15(d)

Fair Value Measurements - Schedule of Changes in Accumulated Other Comprehensive Loss by Category (Details)

v3.24.3
Fair Value Measurements - Schedule of Changes in Accumulated Other Comprehensive Loss by Category (Details) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2022
Increase (Decrease) in Shareholders' Equity      
Beginning balance $ 1,667,835 $ 1,549,371 $ 1,480,329
Gain/(loss) recognized in AOCI on derivatives, net of tax 7,445 15,067 5,500
Amounts reclassified to earnings from accumulated other comprehensive income (12,290) (8,721) 447
Net current period other comprehensive income/(loss) (4,845) 6,346 5,947
Ending balance 1,842,815 1,667,835 1,549,371
Foreign currency translation adjustment      
Increase (Decrease) in Shareholders' Equity      
Beginning balance (50,484) (57,109) (39,605)
Gain/(loss) recognized in AOCI on derivatives, net of tax 11,126 6,509 (17,504)
Amounts reclassified to earnings from accumulated other comprehensive income 133 116 0
Net current period other comprehensive income/(loss) 11,259 6,625 (17,504)
Ending balance (39,225) (50,484) (57,109)
Net unrealized gain on derivatives, net of tax      
Increase (Decrease) in Shareholders' Equity      
Beginning balance 22,869 23,148 (303)
Gain/(loss) recognized in AOCI on derivatives, net of tax (3,681) 8,558 23,004
Amounts reclassified to earnings from accumulated other comprehensive income (12,423) (8,837) 447
Net current period other comprehensive income/(loss) (16,104) (279) 23,451
Ending balance 6,765 22,869 23,148
Total      
Increase (Decrease) in Shareholders' Equity      
Beginning balance (27,615) (33,961) (39,908)
Ending balance $ (32,460) $ (27,615) $ (33,961)