INCOME TAXES (Details) - Schedule of deferred tax assets and liabilities - USD ($) $ in Thousands	Sep. 30, 2019	Sep. 30, 2018
Deferred tax assets:
Bad debt reserves	$ 1,980	$ 1,404
Inventory reserves	8,361	7,709
Deferred compensation (equity compensation and defined benefit plans)	16,544	11,437
Compensation benefits	5,186	5,434
Insurance reserve	1,873	1,782
Warranty reserve	2,896	2,598
Net operating loss	11,077	10,593
Tax credits	9,373	6,379
Deferred Tax Assets, Capital Loss Carryback	2,000	0
Deferred Tax Assets, Interest	5,250	0
Other reserves and accruals	3,738	5,433
Deferred Tax Assets, Gross	68,278	52,769
Valuation allowance	(10,823)	(8,520)
Total deferred tax assets	57,455	44,249
Deferred tax liabilities:
Goodwill and intangibles	(42,477)	(44,402)
Property, plant and equipment	(43,996)	(39,260)
Other	(1,096)	(1,086)
Total deferred tax liabilities	(87,569)	(84,748)
Net deferred liability	$ (30,114)	$ (40,499)