INCOME TAXES (Details) - Schedule of deferred tax assets and liabilities - USD ($) $ in Thousands	Sep. 30, 2020	Sep. 30, 2019
Deferred tax assets:
Bad debt reserves	$ 3,980	$ 1,980
Inventory reserves	9,371	8,361
Deferred compensation (equity compensation and defined benefit plans)	18,904	16,544
Compensation benefits	5,499	5,186
Insurance reserve	1,918	1,873
Warranty reserve	3,981	2,896
Lease liabilities	43,045
Net operating loss	9,618	11,077
Tax credits	7,031	9,373
Capital loss carryback	2,205	2,000
Interest	0	5,250
Other reserves and accruals	6,094	3,738
Deferred tax assets, gross	111,646	68,278
Valuation allowance	(9,824)	(10,823)
Total deferred tax assets	101,822	57,455
Deferred tax liabilities:
Goodwill and intangibles	(44,051)	(42,477)
Property, plant and equipment	(48,172)	(43,996)
Right-of-use assets	(41,747)
Other	(634)	(1,096)
Total deferred tax liabilities	(134,604)	(87,569)
Net deferred tax liabilities	$ (32,782)	$ (30,114)