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SUBSEQUENT EVENT (Details) - Line of credit [Member] - Revolving credit facility [Member]	1 Months Ended
	Feb. 29, 2020 USD ($) term_extension	Aug. 31, 2015 GBP (£)
Subsequent Event [Line Items]
Maximum borrowing capacity | £		£ 20,000,000
Subsequent Event [Member]
Subsequent Event [Line Items]
Maximum borrowing capacity | $	$ 1,250,000,000
Debt, term	5 years
Number of term extensions | term_extension	2
Term extension	1 year

X

- Definition

Debt Instrument, Number Of Term Extensions

+ References

No definition available.

+ Details

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Namespace Prefix:	gww_
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Balance Type:	na
Period Type:	duration

X

- Definition

Debt Instrument, Term Extension

+ References

No definition available.

+ Details

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Namespace Prefix:	gww_
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Balance Type:	na
Period Type:	duration

X

- Definition

Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ 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 210.5-02.19(b),22(b))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

+ References

No definition available.

+ Details

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X

- Details

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X

- Details

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Namespace Prefix:
Data Type:	na
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Period Type:

X

- Details

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