INCOME TAXES - Schedule of deferred tax assets and liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Sep. 30, 2021
Deferred tax assets:
Bad debt reserves	$ 2,873	$ 2,066
Inventory reserves	5,005	11,298
Deferred compensation (equity compensation and defined benefit plans)	8,658	10,598
Compensation benefits	4,859	5,269
Insurance reserve	2,660	2,183
Warranty reserve	3,402	3,761
Lease liabilities	49,649	39,378
Net operating loss	20,528	10,706
Tax credits	5,933	7,198
Capital loss carryback	0	2,533
Other reserves and accruals	5,553	7,474
Deferred tax assets, gross	109,120	102,464
Valuation allowance	(13,490)	(10,425)
Total deferred tax assets	95,630	92,039
Deferred tax liabilities:
Goodwill and intangibles	(25,484)	(46,585)
Property, plant and equipment	(158,074)	(53,817)
Right-of-use assets	(47,949)	(38,511)
Other	(1,224)	(1,232)
Total deferred tax liabilities	(232,731)	(140,145)
Net deferred tax liabilities	$ (137,101)	$ (48,106)