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Business Combinations - Narrative (Details) $ in Thousands, £ in Millions |  |  |  |  |  | 3 Months Ended
--- | --- | --- | --- | --- | --- | ---
Dec. 31, 2021 USD ($) | Oct. 06, 2021 USD ($) | Sep. 30, 2021 USD ($) | Sep. 14, 2021 USD ($) | Sep. 14, 2021 GBP (£) | May 28, 2021 USD ($) asset | Dec. 31, 2021 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |
Number of intangible assets acquired | asset |  |  |  |  |  | 3 |
Goodwill | $ 1,776,239 |  | $ 1,774,406 |  |  |  | $ 1,776,239
VES Group, Inc. |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Percentage of voting equity interests acquired |  |  |  |  |  | 100.00% |
Cash consideration paid, net of cash acquired | 1,360,231 |  | 1,360,231 |  |  | $ 1,360,000 |
Liabilities arising from contingencies | 12,000 |  |  |  |  | 12,000 | 12,000
Indemnification assets |  |  |  |  |  | 6,000 |
Liability for uncertainty in income taxes |  |  |  |  |  | 12,300 |
Goodwill | 865,268 |  | 864,176 |  |  |  | 865,268
Intangible assets | $ 664,000 |  | $ 664,000 |  |  |  | 664,000
VES Group, Inc. | Indemnification Asset On Uncertain Tax Positions |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Indemnification assets |  |  |  |  |  | $ 7,200 |
Connect Assist |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Percentage of voting equity interests acquired |  |  |  | 100.00% |  |  |
Cash payment to acquire business |  |  |  | $ 21,100 | £ 15.5 |  |
Goodwill |  |  |  | 11,300 |  |  |
Intangible assets |  |  |  | $ 7,700 |  |  |
Revenue contributed from acquired business |  |  |  |  |  |  | 5,800
Gross profit contributed from acquired business |  |  |  |  |  |  | 2,200
Navient |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Intangible assets |  | $ 14,900 |  |  |  |  |
Revenue contributed from acquired business |  |  |  |  |  |  | 34,700
Gross profit contributed from acquired business |  |  |  |  |  |  | $ 2,000
Contingent consideration |  | $ 15,300 |  |  |  |  |
Amortization period |  | 27 months |  |  |  |  |
Navient | Maximum |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Contingent consideration |  | $ 65,000 |  |  |  |  |

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