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Income Taxes - Schedule of Deferred Tax Assets (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Sep. 30, 2017
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Income Tax Disclosure [Abstract] |  |
Net operating loss carry forwards | $ 91,981 | $ 103,653
Deferred credits | 2,443 | 4,389
Other accrued expenses | 1,871 | 1,756
Prepaids and other | 3,530 | 8,936
Alternative minimum tax | 1 | 2,536
Other reserves and estimated losses | 836 | 1,335
Operating lease | 6,399 | 13,113
Allowance for doubtful receivables | 905 | 1,087
Subtotal | 107,966 | 136,805
Less: valuation allowance | (1,940) | (2,586)
Total net deferred tax assets | 106,026 | 134,219
Intangibles | (2,613) | (4,317)
Property and equipment | (143,210) | (186,338)
Total deferred tax liabilities | (145,823) | (190,655)
Net deferred tax liability | $ (39,797) | $ (56,436)

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