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Restructuring - Additional Information (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
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Mar. 31, 2023 | Dec. 31, 2022 | Mar. 31, 2023
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring, description | The Company is restructuring its insurance operations in an effort to strengthen its market presence and enhance its focus on GBLI’s core Wholesale Commercial and InsurTech products. As a result, the Company exited its four brokerage divisions: Professional Liability, Excess Casualty, Environmental, and Middle Market Property. The Company ceased writing new business and existing renewals were placed in run-off for these four divisions. The restructuring plan, which was initiated in the fourth quarter of 2022, was completed in the first quarter of 2023. |  |
Restructuring, initiation date | Dec. 31, 2022 |  |
Restructuring, completion date | Mar. 31, 2023 |  |
Restructuring cost | $ 2.2 | $ 3.4 | $ 5.6

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- Definition Date the exit and disposal activities were completed or are expected to be completed, in YYYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 5.P.4(a)) -URI https://asc.fasb.org/extlink&oid=115931487&loc=d3e140904-122747 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 + Details
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- Definition Description of a specific restructuring plan and related activities including the facts and circumstances leading to the restructuring or decision to exit an activity, and the expected completion date. This concept and related items would be utilized for each plan if multiple exit plans have been implemented in the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 5.P.4(a)) -URI https://asc.fasb.org/extlink&oid=115931487&loc=d3e140904-122747 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 + Details
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- Definition Date the restructuring activities were initiated or are expected to be initiated, in YYYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 5.P.4(a)) -URI https://asc.fasb.org/extlink&oid=115931487&loc=d3e140904-122747 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 + Details
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