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Business combinations - Schedule of Asset Acquired and Liabilities Assumed, VES (Details) - USD ($) $ in Thousands |  |  |  | 3 Months Ended
--- | --- | --- | --- | ---
Dec. 31, 2021 | Sep. 30, 2021 | May 28, 2021 | Dec. 31, 2021
Allocation of Assets and Liabilities as of September 30, 2021 |  |  |  |
Goodwill | $ 1,776,239 | $ 1,774,406 |  | $ 1,776,239
VES Group, Inc. |  |  |  |
Allocation of Assets and Liabilities as of September 30, 2021 |  |  |  |
Cash consideration paid, net of cash acquired | 1,360,231 | 1,360,231 | $ 1,360,000 |
Estimated additional cash payments | 4,635 | 4,635 |  |
Estimated cash consideration, net of cash acquired | 1,364,866 | 1,364,866 |  |
Accounts receivable - billed, billable and unbilled | 44,078 | 44,078 |  | 44,078
Prepaid expenses and other current assets | 7,955 | 7,955 |  | 7,955
Property and equipment, net | 8,021 | 9,113 |  | 8,021
Operating lease right-of-use assets | 18,898 | 18,898 |  | 18,898
Intangible assets | 664,000 | 664,000 |  | 664,000
Other assets | 7,166 | 7,166 |  | 7,166
Total identifiable assets acquired | 750,118 | 751,210 |  | 750,118
Accounts payable and accrued compensation | 42,182 | 42,182 |  | 42,182
Operating lease liabilities | 18,898 | 18,898 |  | 18,898
Income taxes payable, current | 5,673 | 5,673 |  | 5,673
Deferred income taxes | 171,497 | 171,497 |  | 171,497
Other long-term liabilities | 12,270 | 12,270 |  | 12,270
Total identifiable liabilities assumed | 250,520 | 250,520 |  | 250,520
Net identifiable assets acquired | 499,598 | 500,690 |  | 499,598
Goodwill | 865,268 | 864,176 |  | 865,268
Net assets acquired | $ 1,364,866 | $ 1,364,866 |  | 1,364,866
Adjustments |  |  |  |
Cash consideration paid, net of cash acquired |  |  |  | 0
Estimated additional cash payments |  |  |  | 0
Estimated cash consideration, net of cash acquired |  |  |  | 0
Accounts receivable - billed, billable and unbilled |  |  |  | 0
Prepaid expenses and other current assets |  |  |  | 0
Property and equipment, net |  |  |  | (1,092)
Operating lease right-of-use assets |  |  |  | 0
Intangible assets |  |  |  | 0
Other assets |  |  |  | 0
Total identifiable assets acquired |  |  |  | (1,092)
Accounts payable and accrued compensation |  |  |  | 0
Operating lease liabilities |  |  |  | 0
Income taxes payable, current |  |  |  | 0
Deferred income taxes |  |  |  | 0
Other long-term liabilities |  |  |  | 0
Total identifiable liabilities assumed |  |  |  | 0
Net identifiable assets acquired |  |  |  | (1,092)
Goodwill |  |  |  | 1,092
Net assets acquired |  |  |  | $ 0

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