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Summary of Significant Accounting Policies - Changes in Accrued Sales Returns (Details) - USD ($) $ in Millions	12 Months Ended
	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]

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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.

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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.

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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.

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No definition available.

+ Details

Name:	sgi_SalesReturnsChargedToSalesAllowanceAccrual
Namespace Prefix:	sgi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration