Long-Term Debt - Narrative (Details) - USD ($) | Nov. 20, 2019 | Sep. 29, 2020 | Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2021 | Nov. 20, 2024 | Sep. 30, 2021 | Nov. 20, 2024 | Jun. 16, 2020 | Dec. 31, 2019 | May 09, 2018 |
Line of Credit Facility [Line Items] | | | | | | | | | | | |
Indebtedness | | $ 43,993,000 | | | | | | | | | |
Unamortized debt issuance costs | | 1,800,000 | | | | | | | | | |
Letters of credit outstanding | | 3,200,000 | | | | | | | | | |
Cash on hand | | $ 8,621,000 | | | | | | | | $ 10,459,000 | |
Forecast | | | | | | | | | | | |
Line of Credit Facility [Line Items] | | | | | | | | | | | |
Quarterly principal payments | | | $ 531,250 | $ 375,000 | $ 187,500 | $ 625,000 | | | | | |
Minimum | | | | | | | | | | | |
Line of Credit Facility [Line Items] | | | | | | | | | | | |
Interest rate during period | | 3.07% | | | | | | | | | |
Maximum | | | | | | | | | | | |
Line of Credit Facility [Line Items] | | | | | | | | | | | |
Interest rate during period | | 6.25% | | | | | | | | | |
2018 Swingline Subfacility | | | | | | | | | | | |
Line of Credit Facility [Line Items] | | | | | | | | | | | |
Maximum borrowing capacity | | | | | | | | | | | $ 10,000,000 |
Amended 2018 Credit Facility | Federal Funds Rate | | | | | | | | | | | |
Line of Credit Facility [Line Items] | | | | | | | | | | | |
Basis spread on variable rate | 0.50% | | | | | | | | | | |
Amended 2018 Credit Facility | Prime Rate | | | | | | | | | | | |
Line of Credit Facility [Line Items] | | | | | | | | | | | |
Basis spread on variable rate | 1.00% | | | | | | | | | | |
Amended 2018 Credit Facility | Minimum | | | | | | | | | | | |
Line of Credit Facility [Line Items] | | | | | | | | | | | |
Commitment fee percentage | 0.20% | | | | | | | | | | |
Amended 2018 Credit Facility | Minimum | LIBOR | | | | | | | | | | | |
Line of Credit Facility [Line Items] | | | | | | | | | | | |
Basis spread on variable rate | 2.00% | | | | | | | | | | |
Amended 2018 Credit Facility | Minimum | Base Rate | | | | | | | | | | | |
Line of Credit Facility [Line Items] | | | | | | | | | | | |
Basis spread on variable rate | 1.00% | | | | | | | | | | |
Amended 2018 Credit Facility | Maximum | | | | | | | | | | | |
Line of Credit Facility [Line Items] | | | | | | | | | | | |
Commitment fee percentage | 0.35% | | | | | | | | | | |
Amended 2018 Credit Facility | Maximum | LIBOR | | | | | | | | | | | |
Line of Credit Facility [Line Items] | | | | | | | | | | | |
Basis spread on variable rate | 2.75% | | | | | | | | | | |
Amended 2018 Credit Facility | Maximum | Base Rate | | | | | | | | | | | |
Line of Credit Facility [Line Items] | | | | | | | | | | | |
Basis spread on variable rate | 1.75% | | | | | | | | | | |
Second Amended 2018 Credit Facility | LIBOR | Forecast | | | | | | | | | | | |
Line of Credit Facility [Line Items] | | | | | | | | | | | |
Basis spread on variable rate | | | | | | | 3.25% | | | | |
Second Amended 2018 Credit Facility | Minimum | LIBOR | Forecast | | | | | | | | | | | |
Line of Credit Facility [Line Items] | | | | | | | | | | | |
Basis spread on variable rate | | | | | | | | 2.00% | | | |
Second Amended 2018 Credit Facility | Maximum | LIBOR | Forecast | | | | | | | | | | | |
Line of Credit Facility [Line Items] | | | | | | | | | | | |
Basis spread on variable rate | | | | | | | | 3.00% | | | |
Revolving Credit Facility | 2018 Term Loan Facility | | | | | | | | | | | |
Line of Credit Facility [Line Items] | | | | | | | | | | | |
Maximum borrowing capacity | | | | | | | | | | | 25,000,000 |
Revolving Credit Facility | 2018 Credit Facility | | | | | | | | | | | |
Line of Credit Facility [Line Items] | | | | | | | | | | | |
Maximum borrowing capacity | | | | | | | | | | | 65,000,000 |
Revolving Credit Facility | Amended 2018 Credit Facility | | | | | | | | | | | |
Line of Credit Facility [Line Items] | | | | | | | | | | | |
Maximum borrowing capacity | $ 75,000,000 | | | | | | | | | | |
Capital expenditure limit in current fiscal year per agreement | 37,000,000 | | | | | | | | | | |
Capital expenditure limit in each year after current fiscal year | $ 45,000,000 | | | | | | | | | | |
Revolving Credit Facility | Second Amended 2018 Credit Facility | | | | | | | | | | | |
Line of Credit Facility [Line Items] | | | | | | | | | | | |
Capital expenditure limit in current fiscal year per agreement | | | | | | | | | $ 12,000,000 | | |
Capital expenditure limit in next fiscal year per agreement | | | | | | | | | 12,000,000 | | |
Liquidity-based performance basket in next fiscal year per agreement | | | | | | | | | 12,000,000 | | |
Capital expenditure limit in 2022 per agreement | | | | | | | | | 34,000,000 | | |
Capital expenditure limit in 2023 per agreement | | | | | | | | | 37,000,000 | | |
Capital expenditure limit after 2023 per agreement | | | | | | | | | $ 45,000,000 | | |
Letter of Credit | 2018 Letter of Credit Subfacility | | | | | | | | | | | |
Line of Credit Facility [Line Items] | | | | | | | | | | | |
Maximum borrowing capacity | | | | | | | | | | | $ 15,000,000 |