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Business combinations - Schedule of Asset Acquired and Liabilities Assumed, VES (Details) - USD ($) $ in Thousands |  |  | 4 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Sep. 30, 2021 | May 28, 2021 | Sep. 30, 2021 | Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2019
Initial Allocation of Assets and Liabilities |  |  |  |  |  |
Cash consideration paid, net of cash acquired |  |  |  | $ 1,798,915 | $ 7,066 | $ 436,839
Goodwill | $ 1,774,406 |  | $ 1,774,406 | 1,774,406 | $ 593,129 | $ 584,469
VES Group, Inc. |  |  |  |  |  |
Initial Allocation of Assets and Liabilities |  |  |  |  |  |
Cash consideration paid, net of cash acquired | 1,360,231 | $ 1,360,231 |  |  |  |
Estimated additional cash payments | 4,635 | 7,494 |  |  |  |
Estimated cash consideration, net of cash acquired | 1,364,866 | 1,367,725 |  |  |  |
Accounts receivable - billed, billable and unbilled | 44,078 | 44,078 | 44,078 | 44,078 |  |
Prepaid expenses and other current assets | 7,955 | 13,911 | 7,955 | 7,955 |  |
Property and equipment, net | 9,113 | 9,113 | 9,113 | 9,113 |  |
Operating lease right-of-use assets | 18,898 | 18,898 | 18,898 | 18,898 |  |
Intangible assets | 664,000 | 664,000 | 664,000 | 664,000 |  |
Other assets | 7,166 | 12,816 | 7,166 | 7,166 |  |
Total identifiable assets acquired | 751,210 | 762,816 | 751,210 | 751,210 |  |
Accounts payable and other liabilities | 42,182 | 42,978 | 42,182 | 42,182 |  |
Operating lease liabilities | 18,898 | 18,898 | 18,898 | 18,898 |  |
Income taxes payable, current | 5,673 | 6,196 | 5,673 | 5,673 |  |
Deferred income taxes | 171,497 | 177,626 | 171,497 | 171,497 |  |
Other long-term liabilities | 12,270 | 6,667 | 12,270 | 12,270 |  |
Total identifiable liabilities assumed | 250,520 | 252,365 | 250,520 | 250,520 |  |
Net identifiable assets acquired | 500,690 | 510,451 | 500,690 | 500,690 |  |
Goodwill | 864,176 | 857,274 | 864,176 | 864,176 |  |
Net assets acquired | $ 1,364,866 | $ 1,367,725 | 1,364,866 | $ 1,364,866 |  |
Adjustments |  |  |  |  |  |
Cash consideration paid, net of cash acquired |  |  | 0 |  |  |
Estimated additional cash payments |  |  | (2,859) |  |  |
Estimated cash consideration, net of cash acquired |  |  | (2,859) |  |  |
Accounts receivable - billed, billable and unbilled |  |  | 0 |  |  |
Prepaid expenses and other current assets |  |  | (5,956) |  |  |
Property and equipment, net |  |  | 0 |  |  |
Operating lease right-of-use assets |  |  | 0 |  |  |
Intangible assets |  |  | 0 |  |  |
Other assets |  |  | (5,650) |  |  |
Total identifiable assets acquired |  |  | (11,606) |  |  |
Accounts payable and other liabilities |  |  | (796) |  |  |
Operating lease liabilities |  |  | 0 |  |  |
Income taxes payable, current |  |  | (523) |  |  |
Deferred income taxes |  |  | (6,129) |  |  |
Other long-term liabilities |  |  | 5,603 |  |  |
Total identifiable liabilities assumed |  |  | (1,845) |  |  |
Net identifiable assets acquired |  |  | (9,761) |  |  |
Goodwill |  |  | 6,902 |  |  |
Net assets acquired |  |  | $ (2,859) |  |  |

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