LEASES - Summary of Supplemental Balance Sheet Information (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Sep. 30, 2021
Operating Leases:
Operating right-of-use assets	$ 149,587	$ 144,598
Lease Liabilities:
Current portion of operating lease liabilities	32,210	29,881
Long-term operating lease liabilities	122,488	119,315
Total operating lease liabilities	154,698	149,196
Finance Leases:
Property, plant and equipment, net	$ 15,113	$ 16,466
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]	PROPERTY, PLANT AND EQUIPMENT, net	PROPERTY, PLANT AND EQUIPMENT, net
Lease Liabilities:
Lease liabilities, notes payable and current portion of long-term debt	$ 2,329	$ 2,347
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
Lease liabilities, long-term debt, net	$ 13,019	$ 14,120
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	$ 15,348	$ 16,467
Accumulated depreciation	$ 4,488	$ 6,136