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CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 25, 2020
Statement of Financial Position [Abstract]
Allowance for Credits	$ 3,900	$ 4,400
Shares, Outstanding	170,307,412	168,567,919
Common stock, par value	$ 1	$ 1
Common stock authorized	291,000,000	291,000,000

X

- Definition

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

+ References

No definition available.

+ Details

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Namespace Prefix:	ggg_
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Balance Type:	credit
Period Type:	instant

X

- Definition

Face amount or stated value per share of common stock.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(29))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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X

- Definition

The maximum number of common shares permitted to be issued by an entity's charter and bylaws.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(29))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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- Definition

Number of shares issued which are neither cancelled nor held in the treasury.

+ References

No definition available.

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- References

No definition available.

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