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INCOME TAXES - Schedule of deferred tax assets and liabilities (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Sep. 30, 2020
--- | --- | ---
Deferred tax assets: |  |
Bad debt reserves | $ 2,066 | $ 3,980
Inventory reserves | 11,298 | 9,371
Deferred compensation (equity compensation and defined benefit plans) | 10,598 | 18,904
Compensation benefits | 5,269 | 5,499
Insurance reserve | 2,183 | 1,918
Warranty reserve | 3,761 | 3,981
Lease liabilities | 39,378 | 43,045
Net operating loss | 10,706 | 9,618
Tax credits | 7,198 | 7,031
Capital loss carryback | 2,533 | 2,205
Other reserves and accruals | 7,474 | 6,094
Deferred tax assets, gross | 102,464 | 111,646
Valuation allowance | (10,425) | (9,824)
Total deferred tax assets | 92,039 | 101,822
Deferred tax liabilities: |  |
Goodwill and intangibles | (46,585) | (44,051)
Property, plant and equipment | (53,817) | (48,172)
Right-of-use assets | (38,511) | (41,747)
Other | (1,232) | (634)
Total deferred tax liabilities | (140,145) | (134,604)
Net deferred tax liabilities | $ (48,106) | $ (32,782)

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