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Acquisitions - Asset Acquisition (Details) - USD ($) $ in Thousands |  |  | 3 Months Ended | 9 Months Ended
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Jun. 01, 2021 | Apr. 01, 2021 | Jun. 30, 2021 | Jun. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Business Acquisition [Line Items] |  |  |  |  |  |
Asset acquisition, contingent consideration arrangements, range of outcomes, value, high |  | $ 225,000 |  |  |  |
Repurchase of non-controlling interest |  | 11,200 | $ 11,191 | $ 0 |  |
Contingent consideration as part of asset acquisition |  | $ 27,200 |  |  | $ 27,200 | $ 0
U.S. Health |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Ownership percentage by noncontrolling interest |  | 4.53% |  |  |  |
Health Savings Account Assets of Bell Bank’s Healthcare Bank Division |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Cash consideration |  | $ 200,000 |  |  |  |
Deferred payments |  | 25,000 |  |  |  |
Additional deferred payments |  | 25,000 |  |  |  |
Decrease in payment of acquire business | $ 12,500 |  |  |  |  |
Additional deferred payments to acquire business | $ 12,500 |  |  |  |  |
Finite-lived intangible assets acquired |  | $ 263,400 |  |  |  |
Weighted average life (in years) |  | 5 years 7 months 6 days |  |  |  |
Deferred liability |  | $ 47,400 |  |  |  |

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- Definition Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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- Definition Amount of increase in assets, excluding financial assets, lacking physical substance with a definite life, from an acquisition. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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