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Supporting Financial Information - Accounts Payable, Accrued Expense and Other Current Liabilities (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Sep. 30, 2018
--- | --- | ---
Business Acquisition [Line Items] |  |
Accounts payable | $ 9,290 | $ 3,393
Accrued benefits | 2,173 | 2,060
Accrued bonus and incentive compensation | 1,577 | 2,191
Accrued workers compensation insurance | 3,836 | 2,642
Other accrued expenses | 2,217 | 664
Accounts payable, accrued expenses, and other current liabilities | 19,093 | $ 10,950
SSS acquisition |  |
Business Acquisition [Line Items] |  |
Accounts payable, accrued expenses, and other current liabilities | $ 4,900 |

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