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v3.24.1.1.u2

Description of business and summary of significant accounting policies, Deposits on Real Estate Under Option or Contract (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2024 | Mar. 31, 2023
Deposits on Real Estate under Option or Contract [Abstract] |  |
Write-off of deposits associated with terminated option contracts | $ 0 | $ 0

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- References No definition available. + Details
Name: | sdhc_DepositsOnRealEstateUnderOptionOrContractsAbstract
Namespace Prefix: | sdhc_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The write-off of deposits associated with terminated option contracts during the period. + References No definition available. + Details
Name: | sdhc_WriteOffOfDepositsAssociatedWithTerminatedOptionContracts
Namespace Prefix: | sdhc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration