LEASES - Right-of-use lease assets and lease liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2025	Sep. 30, 2025
Right-of-use lease assets and lease liabilities
Operating ROU assets, net	$ 56,285	$ 46,358
Current portion of operating lease liabilities	6,000	6,896
Long-term operating lease liabilities	55,388	44,344
Total lease liability	61,388	51,240
Finance ROU assets, net	2,771	2,900
Current portion of long-term finance lease	511	495
Long-term finance leases	2,297	2,430
Total finance lease liabilities	$ 2,808	$ 2,925