LEASES - Schedule of Supplemental Condensed Consolidated Balance Sheet Information Related to Leases (Details) - USD ($) $ in Thousands	Dec. 31, 2025	Sep. 30, 2025
Operating Leases:
Operating right-of-use assets	$ 181,170	$ 167,829
Lease Liabilities:
Current portion of operating lease liabilities	34,370	32,307
Long-term operating lease liabilities	159,299	147,203
Total operating lease liabilities	193,669	179,510
Finance Leases:
Property, plant and equipment, net	$ 525	$ 430
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]	PROPERTY, PLANT AND EQUIPMENT, net	PROPERTY, PLANT AND EQUIPMENT, net
Lease Liabilities:
Notes payable and current portion of long-term debt	$ 117	$ 102
Finance Lease, Liability, Current, Statement of Financial Position [Extensible List]	Notes payable and current portion of long-term debt	Notes payable and current portion of long-term debt
Long-term debt, net	$ 267	$ 149
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]	Long-Term Debt, Excluding Current Maturities	Long-Term Debt, Excluding Current Maturities
Total financing lease liabilities	$ 384	$ 251
Accumulated depreciation	$ 755	$ 1,399