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Summary of Significant Accounting Policies (Details) - USD ($) $ in Thousands |  | 12 Months Ended |
--- | --- | --- | ---
Oct. 07, 2022 | Oct. 07, 2022 | Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2020
Accounting Policies [Abstract] |  |  |  |  |  |
Deferred financing cost amortization |  |  | $ 268 | $ 199 | $ 198 |
Debt Issuance Costs, Noncurrent, Net |  |  | 836 | 1,031 |  |
Accounts Receivable, Allowance for Credit Loss |  |  | (1,649) | (5,361) |  |
Deferred tax assets |  |  | 20,383 | 20,519 |  |
Letters of Credit Outstanding, Amount |  |  | 4,166 |  |  |
Redeemable Noncontrolling Interest, Equity, Redemption Value |  |  | 49,951 |  |  |
Noncontrolling Interest, Change in Redemption Value |  |  | 15,701 | 4,699 | 315 |
Operating right of use assets |  |  | 61,761 | 55,890 |  |
Operating Lease, Liability |  |  | 61,594 |  |  |
Payments for Repurchase of Redeemable Noncontrolling Interest |  |  | 0 | 0 | 1,188 |
Increase (Decrease) in Deferred Income Taxes |  |  | 70 |  |  |
Stockholders' Equity Attributable to Parent |  |  | 449,985 | 361,288 | 345,953 | $ 283,313
Redeemable Noncontrolling Interest [Line Items] |  |  |  |  |  |
Payments for Repurchase of Redeemable Noncontrolling Interest |  |  | $ 0 | $ 0 | $ 1,188 |
Sale of Stock, Percentage of Ownership before Transaction | 100.00% | 100.00% |  |  |  |
Noncontrolling Owner |  |  |  |  |  |
Redeemable Noncontrolling Interest [Line Items] |  |  |  |  |  |
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners |  |  | 20.00% |  |  |
Owner |  |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |  |
Noncontrolling Interest, Ownership Percentage by Parent |  |  | 80.00% |  |  |
Accounting Standards Update 2016-13 |  |  |  |  |  |
Accounting Policies [Abstract] |  |  |  |  |  |
Accounts Receivable, Allowance for Credit Loss, Current |  |  | $ 284 |  |  |

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