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Summary of Significant Accounting Policies - Changes in Accrued Sales Returns (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023
Changes in Accrued Sales Returns [Roll Forward] |  |
Beginning balance | $ 43.7 | $ 40.5
Amounts accrued | 209.9 | 208.2
Returns charged to accrual | (209.4) | (205.0)
Ending balance | $ 44.2 | $ 43.7

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- Definition Changes in Accrued Sales Returns [Roll Forward] + References No definition available. + Details
Name: | sgi_ChangesinAccruedSalesReturnsRollForward
Namespace Prefix: | sgi_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Carrying value as of the balance sheet date of obligations incurred through that date for estimated product return rights granted to customers. + References No definition available. + Details
Name: | sgi_SalesReturnsAccrual
Namespace Prefix: | sgi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Increase in the accrual for estimated sales returns. + References No definition available. + Details
Name: | sgi_SalesReturnsAndAllowancesGood
Namespace Prefix: | sgi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Reduction in the accrual for returns charged to sales. The aggregate refunds recognized during an accounting period due to goods returned. + References No definition available. + Details
Name: | sgi_SalesReturnsChargedToSalesAllowanceAccrual
Namespace Prefix: | sgi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration