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Debt (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2019
Debt Disclosure [Abstract] |  |  |
Revolving loan | $ 40,339 | $ 12 |
Other long-term debt | 63 | 205 |
Long-term debt | 39,746 | 217 |
Debt Issuance Costs, Noncurrent, Net | 656 | 736 |
Letters of Credit Outstanding, Amount | 4,527 |  |
Line of Credit Facility, Remaining Borrowing Capacity | $ 55,134 |  |
Line of Credit Facility, Interest Rate at Period End | 1.38% |  |
Interest expense | $ 962 | $ 777 | $ 1,857
Line of Credit Facility, Maximum Borrowing Capacity | 100,000 |  |
Liquidity | $ 78,239 |  |
Fixed Charge Coverage Ratio | 12.0 |  |
Debt Instrument, Covenant Compliance | 20,000 |  |

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- Definition States whether the entity was in compliance with the debt covenants throughout the reporting period, and describes facts and circumstances of any compliance failure. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=123599511&loc=d3e64711-112823 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition Amount, after accumulated amortization, of debt issuance costs classified as noncurrent. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=124435984&loc=d3e28555-108399 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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