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Business combinations - Schedule of Asset Acquired and Liabilities Assumed, VES (Details) - USD ($) $ in Thousands |  | 9 Months Ended |
--- | --- | --- | ---
May 28, 2021 | Jun. 30, 2021 | Jun. 30, 2020 | Sep. 30, 2020
Business Acquisition [Line Items] |  |  |  |
Cash consideration paid, net of cash acquired |  | $ 1,779,473 | $ 2,611 |
Goodwill |  | $ 1,757,795 |  | $ 593,129
VES Group, Inc. |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Cash consideration paid, net of cash acquired | $ 1,360,231 |  |  |
Estimated additional cash payments | 7,494 |  |  |
Estimated cash consideration, net of cash acquired | 1,367,725 |  |  |
Accounts receivable - billed, billable and unbilled | 44,078 |  |  |
Prepaid expenses and other current assets | 13,911 |  |  |
Property and equipment, net | 9,113 |  |  |
Operating lease right-of-use assets | 18,898 |  |  |
Intangible assets | 664,000 |  |  |
Other assets | 12,816 |  |  |
Total identifiable assets acquired | 762,816 |  |  |
Accounts payable and other liabilities | 42,978 |  |  |
Operating lease liabilities, less current portion | 18,898 |  |  |
Income taxes payable | 6,196 |  |  |
Deferred income taxes | 177,626 |  |  |
Other long-term liabilities | 6,667 |  |  |
Net identifiable assets acquired | 510,451 |  |  |
Goodwill | 857,274 |  |  |
Net assets acquired | $ 1,367,725 |  |  |

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- Definition Amount due from customers or clients for goods or services, including trade receivables, that have been delivered or sold in the normal course of business, and amounts due from others, including related parties expected to be converted to cash, sold or exchanged within one year or the normal operating cycle, if longer, acquired at the acquisition date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=123413009&loc=d3e4845-128472 + Details
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