XML 57 R5.htm IDEA: XBRL DOCUMENT v3.2.0.727

Consolidated Balance Sheets Parenthetical - USD ($) $ in Thousands	Jun. 26, 2015	Dec. 26, 2014
Statement Of Financial Position Parenthetical [Abstract]
Receivables allowances	$ 9,300	$ 8,100

X

- Definition

Allowances for doubtful accounts, returns and credits. This includes allowances for accounts that are due to the Company within one year and are deemed uncollectable and allowances for sales returns and other credits.

+ References

No definition available.

+ Details

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

X

- References

No definition available.

+ Details

Name:	ggg_StatementOfFinancialPositionParentheticalAbstract
Namespace Prefix:	ggg_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration