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Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($) $ in Millions	Sep. 29, 2023	Dec. 30, 2022
Statement of Financial Position [Abstract]
Allowance for Credits	$ 4.9	$ 7.0

X

- Definition

Allowance for Credits: Includes allowance for doubtful accounts and other credits against receivables.

+ References

No definition available.

+ Details

Name:	ggg_AllowanceforCredits
Namespace Prefix:	ggg_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- References

No definition available.

+ Details

Name:	us-gaap_StatementOfFinancialPositionAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration