v3.26.1
Stockholders' Equity - Schedule of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 6 Months Ended
Mar. 31, 2026
Mar. 31, 2025
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning balance $ 1,726,986 $ 1,767,847
Other comprehensive income (loss) before reclassifications (5,313) (28,784)
Amounts reclassified from accumulated other comprehensive income (loss) 55 36
Ending balance 1,554,677 1,695,452
Accumulated Other Comprehensive Income (Loss)    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning balance (22,213) (13,464)
Ending balance (27,471) (42,212)
Currency Translation Adjustments    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning balance (12,918) (34,170)
Other comprehensive income (loss) before reclassifications (8,135) (23,923)
Amounts reclassified from accumulated other comprehensive income (loss) 0 0
Ending balance (21,053) (58,093)
Unrealized Gains (Losses) on Available- for-Sale Securities Net of Tax    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning balance 213 (263)
Other comprehensive income (loss) before reclassifications (895) 363
Amounts reclassified from accumulated other comprehensive income (loss) 72 0
Ending balance (610) 100
Gains (Losses) on Derivative Net of Tax    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning balance (8,729) 21,468
Other comprehensive income (loss) before reclassifications 3,805 (5,088)
Amounts reclassified from accumulated other comprehensive income (loss) 0 0
Ending balance (4,924) 16,380
Pension Liability Adjustments Net of Tax    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning balance (779) (499)
Other comprehensive income (loss) before reclassifications (88) (136)
Amounts reclassified from accumulated other comprehensive income (loss) (17) 36
Ending balance $ (884) $ (599)