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Income Taxes - Schedule of Reconciliation of Actual Income Taxes to Income Taxes at Expected U.S. Federal Corporate Income Tax Rate (Details) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2021
Income Tax Expense (Benefit), Effective Income Tax Rate Reconciliation, Amount [Abstract] |  |  |
Tax (benefit) expense at the federal statutory rate | $ (3,188) | $ 3,945 | $ 722
Effect of permanent book-tax differences | 757 | 11 | 54
State tax provision | (395) | 554 | 24
Valuation allowance for net deferred tax assets | 1,594 | (3,138) | 842
Uncertain tax items | (1,004) | 55 | (276)
Tax rate differential | 358 | 535 | 267
Other items | (722) | (544) | 293
Total (benefit) provision | $ (2,600) | $ 1,418 | $ 1,926
Effective Income Tax Rate Reconciliation, Percent [Abstract] |  |  |
Tax (benefit) expense at the federal statutory rate | 21.00% | 21.00% | 21.00%
Effect of permanent book-tax differences | (5.00%) | 0.10% | 1.60%
State tax provision | 2.60% | 2.90% | 0.70%
Valuation allowance for net deferred tax assets | (10.50%) | (16.70%) | 24.50%
Uncertain tax items | 6.60% | 0.30% | (8.00%)
Tax rate differential | (2.40%) | 2.80% | 7.80%
Other items | 4.80% | (2.90%) | 8.40%
Total (benefit) provision | 17.10% | 7.50% | 56.00%

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- Definition Percentage of domestic federal statutory tax rate applicable to pretax income (loss). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 235 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(h)(2)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480678/235-10-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 12 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-12 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 6.I.Fact.4) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479360/740-10-S99-1 + Details
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