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Business combinations - Narrative (Details) $ in Thousands, $ in Millions, ₩ in Billions |  |  |  |  |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 30, 2021 USD ($) | May 28, 2021 USD ($) | Mar. 31, 2021 USD ($) | Mar. 01, 2021 USD ($) | Aug. 21, 2020 USD ($) | Aug. 21, 2020 KRW (₩) | Feb. 28, 2020 USD ($) | Feb. 28, 2020 AUD ($) | Jun. 30, 2021 USD ($) | Jun. 30, 2021 USD ($) | Jun. 30, 2020 USD ($) | Jun. 30, 2021 USD ($) | Jun. 30, 2020 USD ($) | Sep. 30, 2020 USD ($) | Aug. 21, 2020 KRW (₩) | Feb. 28, 2020 AUD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization of intangible assets |  |  |  |  |  |  |  |  |  | $ 12,132 | $ 8,712 | $ 23,718 | $ 26,734 |  |  |
Revenue |  |  |  |  |  |  |  |  |  | 1,243,520 | 901,337 | 3,148,354 | 2,537,701 |  |  |
Gross profit |  |  |  |  |  |  |  |  |  | 291,856 | $ 185,603 | 728,569 | $ 514,151 |  |  |
Acquisition-related expenses |  |  |  |  |  |  |  |  |  |  |  | 8,800 |  |  |  |
Goodwill | $ 1,757,795 |  |  |  |  |  |  |  | $ 1,757,795 | 1,757,795 |  | $ 1,757,795 |  | $ 593,129 |  |
Weighted Average |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated Straight-Line Useful Life |  |  |  |  |  |  |  |  |  |  |  | 11 years 2 months 12 days |  |  |  |
Weighted Average | Customer contracts and relationships |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated Straight-Line Useful Life |  |  |  | 11 years 2 months 12 days |  |  |  |  |  |  |  |  |  |  |  |
Weighted Average | Technology-based intangible assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated Straight-Line Useful Life |  |  |  |  |  |  |  |  |  |  |  | 13 years 8 months 12 days |  |  |  |
Weighted Average | Provider network |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated Straight-Line Useful Life |  |  |  |  |  |  |  |  |  |  |  | 11 years 10 months 24 days |  |  |  |
VES Group, Inc. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of voting equity interests acquired |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated cash consideration, net of cash acquired |  | $ 1,367,725 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Liabilities arising from contingencies |  | 12,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Indemnification assets |  | 6,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Indemnification assets, range of outcomes, value, low |  | 6,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Indemnification assets, range of outcomes, value, high |  | 12,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Liability for uncertainty in income taxes |  | 11,800 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue contributed from acquired business |  |  |  |  |  |  |  |  | 45,800 |  |  |  |  |  |  |
Gross profit contributed from acquired business |  |  |  |  |  |  |  |  | 19,500 |  |  |  |  |  |  |
Amortization of intangible assets |  |  |  |  |  |  |  |  | 4,600 |  |  |  |  |  |  |
Acquisition-related expenses |  |  |  |  |  |  |  |  |  |  |  | $ 52,200 |  |  |  |
Goodwill |  | 857,274 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets |  | 664,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
VES Group, Inc. | Indemnification Asset On Uncertain Tax Positions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Indemnification assets |  | $ 6,700 |  |  |  |  |  |  |  |  |  |  |  |  |  |
VES Group, Inc. | Customer contracts and relationships |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated Straight-Line Useful Life |  | 12 years |  |  |  |  |  |  |  |  |  |  |  |  |  |
VES Group, Inc. | Technology-based intangible assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated Straight-Line Useful Life |  | 14 years |  |  |  |  |  |  |  |  |  |  |  |  |  |
Attain |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated cash consideration, net of cash acquired | 419,097 |  | $ 419,864 | $ 419,100 |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  | 56,400 |  | 74,800 |  |  |  |
Gross profit |  |  |  |  |  |  |  |  |  | 13,200 |  | 17,100 |  |  |  |
Acquisition-related expenses |  |  |  |  |  |  |  |  |  |  |  | 300 |  |  |  |
Goodwill | 304,026 |  | 303,465 |  |  |  |  |  | 304,026 | 304,026 |  | 304,026 |  |  |  |
Intangible assets | $ 105,000 |  | $ 105,000 |  |  |  |  |  | $ 105,000 | 105,000 |  | $ 105,000 |  |  |  |
Attain | Customer Relationships |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated Straight-Line Useful Life |  |  |  | 10 years |  |  |  |  |  |  |  |  |  |  |  |
InjuryNet |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of voting equity interests acquired |  |  |  |  |  |  | 100.00% |  |  |  |  |  |  |  |  | 100.00%
Cash payment to acquire business |  |  |  |  |  |  | $ 4,400 | $ 6.7 |  |  |  |  |  |  |  |
Contingent consideration |  |  |  |  |  |  | 2,100 |  |  |  |  |  |  |  |  | $ 3.1
Goodwill |  |  |  |  |  |  | 2,600 |  |  |  |  |  |  |  |  |
Intangible assets |  |  |  |  |  |  | $ 900 |  |  |  |  |  |  |  |  |
Index Root |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of voting equity interests acquired |  |  |  |  | 100.00% |  |  |  |  |  |  |  |  |  | 100.00% |
Cash payment to acquire business |  |  |  |  | $ 5,400 | ₩ 6.3 |  |  |  |  |  |  |  |  |  |
Contingent consideration |  |  |  |  | 900 |  |  |  |  |  |  |  |  |  | ₩ 1.1 |
Goodwill |  |  |  |  | 4,600 |  |  |  |  |  |  |  |  |  |  |
Intangible assets |  |  |  |  | $ 1,400 |  |  |  |  |  |  |  |  |  |  |
Reversal of acquisition related costs |  |  |  |  |  |  |  |  |  | $ 1,000 |  |  |  |  |  |

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Percentage of voting equity interests acquired at the acquisition date in the business combination. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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- Definition This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 23 -URI http://asc.fasb.org/extlink&oid=123586518&loc=d3e1043-128460 + Details
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- Definition Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=116859721&loc=d3e6613-128477 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=120321790&loc=d3e6927-128479 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=116859721&loc=d3e6578-128477 + Details
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- Definition For indemnification assets recognized in connection with a business combination, this element represents an estimate of the high-end of the potential range (undiscounted) of the indemnification benefit which may be realized. + 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 (a)(3) -URI http://asc.fasb.org/extlink&oid=123413009&loc=d3e4845-128472 + Details
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- Definition The amount, measured at acquisition-date fair value, of all liabilities assumed that arise from contingencies and were recognized by the entity. + 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 (d)(1) -URI http://asc.fasb.org/extlink&oid=123413009&loc=d3e4845-128472 + Details
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