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Income Taxes - Schedule of Income Tax Provision Attributable to Income from Continuing Operations (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2016
Income Tax Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Statutory federal income tax rate |  |  |  |  |  |  |  |  | 35.00% | 24.53% | 35.00% |
Tax at the statutory federal rate |  |  |  |  |  |  |  |  |  | $ 3,198 | $ (4,670) | $ 4,382
Increase (decrease) resulting from: |  |  |  |  |  |  |  |  |  |  |  |
State income taxes, net of federal benefit |  |  |  |  |  |  |  |  |  | 857 | (402) | 457
Permanent and other reconciling items, net |  |  |  |  |  |  |  |  |  | 221 | 548 | 773
Expiration of capital loss carryforward |  |  |  |  |  |  |  |  |  | 5,634 | 581 | 0
Reduction in deferred tax liability resulting from the Act |  |  |  |  |  |  |  |  |  | (9,847) | 0 | 0
Stock option cancellation |  |  |  |  |  |  |  |  |  | 347 | 0 | 0
Other |  |  |  |  |  |  |  |  |  | (20) | 97 | (91)
Provision (benefit) for income taxes | $ (284) | $ 4,941 | $ 8,150 | $ (12,417) | $ (10,559) | $ 3,665 | $ 4,321 | $ (1,273) |  | $ 390 | $ (3,846) | $ 5,521

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- Definition Percentage of domestic federal statutory tax rate applicable to pretax income (loss). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319 + Details
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