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Business combinations - Schedule of Asset Acquired and Liabilities Assumed, Attain (Details) - USD ($) $ in Thousands |  |  |  | 3 Months Ended |
--- | --- | --- | --- | --- | ---
Jun. 30, 2021 | Mar. 31, 2021 | Mar. 01, 2021 | Jun. 30, 2021 | Sep. 30, 2020
Estimated fair value of assets and liabilities at acquisition date |  |  |  |  |
Goodwill | $ 1,757,795 |  |  | $ 1,757,795 | $ 593,129
Attain |  |  |  |  |
Estimated fair value of assets and liabilities at acquisition date |  |  |  |  |
Cash consideration, net of cash acquired | 419,097 | $ 419,864 | $ 419,100 |  |
Accounts receivable - billed, billable and unbilled | 39,375 | 39,274 |  | 39,375 |
Prepaid expenses and other current assets | 926 | 1,336 |  | 926 |
Property and equipment, net | 0 | 703 |  | 0 |
Operating lease right-of-use assets | 24,960 | 25,089 |  | 24,960 |
Other assets | 74 | 84 |  | 74 |
Intangible assets | 105,000 | 105,000 |  | 105,000 |
Total identifiable assets acquired | 170,335 | 171,486 |  | 170,335 |
Accounts payable and other liabilities | 28,863 | 28,301 |  | 28,863 |
Operating lease liabilities, less current portion | 26,401 | 26,786 |  | 26,401 |
Net identifiable assets acquired | 115,071 | 116,399 |  | 115,071 |
Goodwill | 304,026 | 303,465 |  | 304,026 |
Net assets acquired | $ 419,097 | $ 419,864 |  | 419,097 |
Adjustments |  |  |  |  |
Cash consideration, net of cash acquired |  |  |  | (767) |
Accounts receivable - billed, billable and unbilled |  |  |  | 101 |
Prepaid expenses and other current assets |  |  |  | (410) |
Property and equipment, net |  |  |  | (703) |
Operating lease right-of-use assets |  |  |  | (129) |
Other assets |  |  |  | (10) |
Intangible assets |  |  |  | 0 |
Total identifiable assets acquired |  |  |  | (1,151) |
Accounts payable and other liabilities |  |  |  | 562 |
Operating lease liabilities, less current portion |  |  |  | (385) |
Net identifiable assets acquired |  |  |  | (1,328) |
Goodwill |  |  |  | 561 |
Net assets acquired |  |  |  | $ (767) |

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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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