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Business Combinations - Total Acquisition Consideration and Fair Value of Net Assets Acquired (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2018
--- | --- | --- | ---
Net assets acquired |  |  |
Goodwill | $ 67,144 | $ 52,758 | $ 25,989
IBA |  |  |
Business Acquisition [Line Items] |  |  |
Preliminary purchase price for IBA | 32,706 |  |
Net assets acquired |  |  |
Cash and cash equivalents | 28 |  |
Accounts receivable | 3,907 |  |
Other current assets | 124 |  |
Total current assets | 4,059 |  |
Accounts payable and accrued expenses | (758) |  |
Payroll liabilities | (1,269) |  |
Other current liabilities | (177) |  |
Net working capital | 1,855 |  |
Equipment and improvements, net | 28 |  |
Other long-term assets/liabilities | 214 |  |
Net identifiable assets acquired | 2,097 |  |
Goodwill | 30,609 |  |
Net assets acquired | $ 32,706 |  |

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