Debt - Schedule of Debt (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Sep. 30, 2024
Debt Instrument [Line Items]
Australian credit facility	$ 12,881	$ 13,433
Line of Credit, Current	0	31,250
Short-term borrowings and current portion of long-term debt	12,881	44,683
Long-term portion:
Less: financing costs, net	3,479	2,592
Long-term debt, net	1,049,121	879,146
Total debt	1,062,002	923,829
Credit Facility | Amended and Restated Credit Agreement | Revolving credit facility
Long-term portion:
Long-term debt	221,300	125,000
Credit Facility | Amended and Restated Credit Agreement | Unsecured Debt
Long-term portion:
Long-term debt	500,000	437,500
Credit Facility | Term facility | Unsecured Debt
Long-term portion:
Long-term debt	90,000	109,938
Credit Facility | Receivables securitization facility
Long-term portion:
Long-term debt	$ 241,300	$ 209,300