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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)

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