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Summary of Significant Accounting Policies (Details) - USD ($) | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2021 | Jun. 30, 2021 | Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2019 | Oct. 01, 2019 | Sep. 30, 2018
Accounting Policies [Abstract] |  |  |  |  |  |  |
Goodwill impairment expense | $ 0 |  |  | $ 6,976,000 | $ 0 |  |
Deferred financing cost amortization |  |  | $ 198,000 | 152,000 | 318,000 |  |
Debt Issuance Costs, Noncurrent, Net | (656,000) |  | (656,000) | (736,000) |  |  |
Accounts Receivable, Allowance for Credit Loss | (2,387,000) |  | (2,387,000) | (2,613,000) |  |  |
Deferred tax assets | $ 19,009,000 |  | 19,009,000 | 33,803,000 |  |  |
Loss Contingency, Undiscounted Amount of Insurance-related Assessment Liability |  |  | 3,266,000 | $ 3,886,000 |  |  |
Accrual for Loss Contingencies, Undiscounted, First Year |  |  | 1,047,000 |  |  |  |
Accrual for Loss Contingencies, Undiscounted, Second Year |  |  | 714,000 |  |  |  |
Accrual for Loss Contingencies, Undiscounted, Third Year |  |  | 452,000 |  |  |  |
Accrual for Loss Contingencies, Undiscounted, Fourth Year |  |  | 285,000 |  |  |  |
Accrual for Loss Contingencies, Undiscounted, Fifth Year |  |  | 167,000 |  |  |  |
Accrual for Insurance Loss Contingencies, Undiscounted, after Fifth Year |  |  | $ 601,000 |  |  |  |
Loss Contingency Accrual, Insurance-related Assessment, Discount Rate | 1.00% |  | 1.00% | 0.30% |  |  |
Accrued Insurance, Current | $ 3,234,000 |  | $ 3,234,000 | $ 3,832,000 |  |  |
Liability for Claims and Claims Adjustment Expense, Disability, Accident and Health | 2,553,000 |  | 2,553,000 | 2,422,000 |  |  |
Letters of Credit Outstanding, Amount | 4,527,000 |  | 4,527,000 |  |  |  |
Redeemable Noncontrolling Interest, Equity, Redemption Value | 18,262,000 |  | 18,262,000 |  |  |  |
Noncontrolling Interest, Change in Redemption Value |  |  | (315,000) |  | (80,000) |  |
Operating right of use assets | 42,916,000 |  | 42,916,000 | 31,786,000 |  | $ 32,434,000 |
Operating Lease, Liability | 42,623,000 |  | 42,623,000 |  |  | $ 32,237,000 |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |
Accounts Receivable, Allowance for Credit Loss | 2,387,000 |  | 2,387,000 | 2,613,000 |  |  |
Payments for Repurchase of Redeemable Noncontrolling Interest |  | $ 1,188,000 | 1,188,000 |  |  |  |
Increase (Decrease) in Deferred Income Taxes |  |  | 70,000 |  |  |  |
Stockholders' Equity Attributable to Parent | 345,953,000 |  | 345,953,000 | 283,313,000 | 246,248,000 |  | $ 220,407,000
Accounting Standards Update 2016-13 |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |
Accounts Receivable, Allowance for Credit Loss, Current | 284,000 |  | 284,000 |  |  |  |
Accounts Receivable, Allowance for Credit Loss, Current | 284,000 |  | 284,000 |  |  |  |
Trade Accounts Receivable |  |  |  |  |  |  |
Accounting Policies [Abstract] |  |  |  |  |  |  |
Accounts Receivable, Allowance for Credit Loss | (2,387,000) |  | (2,387,000) | (2,613,000) | (1,184,000) |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |
Accounts Receivable, Allowance for Credit Loss | $ 2,387,000 |  | 2,387,000 | 2,613,000 | $ 1,184,000 |  |
Addition to costs and expenses |  |  | 1,216,000 | 1,864,000 |  |  |
Deductions for uncollectible receivables written off, net of recoveries |  |  | $ (1,442,000) | $ (435,000) |  |  |

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