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Summary of Significant Accounting Policies - Restricted Cash (Details) $ in Millions | 1 Months Ended
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Aug. 31, 2024 USD ($)
250 Water Street litigation |
Amount of litigation | $ 40.0

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- Definition The amount of cash paid for the settlement of litigation or for other legal issues during the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 25 -Subparagraph (g) -SubTopic 10 -Topic 230 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-25 + Details
Name: | us-gaap_PaymentsForLegalSettlements
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
Name: | srt_LitigationCaseAxis=seg_TwoHundredFiftyWaterStreetLitigationCaseMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |