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Income Taxes - Schedule of Deferred Tax Assets (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Sep. 30, 2018
--- | --- | ---
Income Tax Disclosure [Abstract] |  |
Net operating carry forwards | $ 106,645 | $ 91,981
Deferred credits | 1,882 | 2,443
Other accrued expenses | 2,329 | 1,871
Prepaids and other | 2,576 | 3,530
State alternative minimum tax | 1 | 1
Other reserves and estimated losses | 947 | 836
Operating lease | 4,928 | 6,399
Allowance for doubtful receivables |  | 905
Subtotal | 119,308 | 107,966
Less: valuation allowance | (1,890) | (1,940)
Total net deferred tax assets | 117,418 | 106,026
Intangibles | (2,204) | (2,613)
Property and equipment | (170,517) | (143,210)
Total deferred tax liabilities | (172,721) | (145,823)
Net deferred tax liability | $ (55,303) | $ (39,797)

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