Debt Instrument, Redemption Price, Specific Event, Percentage

No definition available.

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Period Type:	duration

- Definition

Number Of Debt Agreements

+ References

No definition available.

+ Details

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Namespace Prefix:	gww_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Amount of the total principal payments made during the annual reporting period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
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-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Date the debt agreement requires the first payment to be made, in CCYY-MM-DD format.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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Balance Type:	na
Period Type:	duration

- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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+ Details

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

- Definition

The average effective interest rate during the reporting period.

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+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	na
Period Type:	duration

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

+ Details

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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- Definition

Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

+ References

+ Details

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Balance Type:	na
Period Type:	duration

- Definition

Amount of the required periodic payments applied to principal.

+ References

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Percentage price of original principal amount of debt at which debt can be redeemed by the issuer.

+ References

+ Details

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Period Type:	duration

- 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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Period Type:	duration

- Definition

Amount of debt issuance costs (for example, but not limited to, legal, accounting, broker, and regulatory fees).

+ References

No definition available.

+ Details

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Period Type:	duration

- Definition

Weighted average interest rate of debt outstanding.

+ References

No definition available.

+ Details

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Period Type:	instant

- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 19, 20, 22
-Article 5

+ Details

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

- Definition

The fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used.

+ References

No definition available.

+ Details

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Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Date the credit facility first became available, in CCYY-MM-DD format.

+ References

+ Details

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

- 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

+ Details

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Balance Type:	credit
Period Type:	instant

- Definition

Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

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+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of long-term debt, after unamortized discount or premium, scheduled to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

+ Details

Name:	us-gaap_LongTermDebtCurrent
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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

+ References

No definition available.

+ Details

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- Definition

Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Period Type:	instant

- Definition

Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

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- Definition

Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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-Name Accounting Standards Codification
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- Definition

Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

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Period Type:	instant

- Definition

Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

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Period Type:	instant

- Definition

Including both current and noncurrent portions, carrying amount as of the balance sheet date of other forms of debt not elsewhere specified in the taxonomy with initial maturities beyond one year or beyond the normal operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 19, 20, 22
-Article 5

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The cash inflow during the period from additional borrowings in aggregate debt. Includes proceeds from short-term and long-term debt.

+ References

No definition available.

+ Details

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Balance Type:	debit
Period Type:	duration

- Definition

The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

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-Name Accounting Standards Codification
-Glossary Financing Activities
-URI http://asc.fasb.org/extlink&oid=6513228

+ Details

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- Details

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- Details

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- Details

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- Details

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- Details

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- Details

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LONG-TERM DEBT (Details) CAD in Millions			1 Months Ended	5 Months Ended	9 Months Ended	12 Months Ended
LONG-TERM DEBT (Details) CAD in Millions	Aug. 26, 2015 GBP (£)	Jun. 11, 2015 USD ($)	Feb. 28, 2013 GBP (£)	May. 31, 2012	Sep. 30, 2015 CAD	Dec. 31, 2015 USD ($) debt_agreement	Dec. 31, 2015 CAD	Dec. 31, 2014 USD ($)	Dec. 31, 2014 CAD	Dec. 31, 2013 USD ($)	Dec. 31, 2015 GBP (£) debt_agreement	Dec. 31, 2015 JPY (¥) debt_agreement	Sep. 30, 2014 USD ($)
Debt Instrument [Line Items]
Other Long-term Debt						$ 25,991,000		$ 21,778,000
Debt Issuance Cost						(12,947,000)		(1,203,000)
Current maturities of long-term debt						(247,346,000)		(23,404,000)
Long-term Debt						1,388,414,000		403,333,000
Repayments of Long-term Debt						52,838,000		170,907,000		$ 16,681,000
2016						247,346,000		23,404,000
2017						15,589,000
2018						30,399,000
2019						141,983,000
2020						205,312,000
Thereafter						1,008,078,000
Bank term loan [Member]
Debt Instrument [Line Items]
Long-term Debt						$ 114,614,000		$ 126,770,000
Debt Instrument, Maturity Date				Nov. 30, 2016
Payment start date								Aug. 31, 2013	Aug. 31, 2013
Debt Instrument, Interest Rate During Period						1.24%	1.24%
Line of Credit [Member] \| Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Debt Instrument, Term	5 years
Line of Credit Facility, Maximum Borrowing Capacity \| £	£ 20,000,000
Line of Credit Facility, Commitment Fee Percentage						0.26%	0.26%
Long-term Line of Credit						$ 0
Senior Notes [Member]
Debt Instrument [Line Items]
Long-term Debt						1,000,000,000		$ 0
Senior Notes [Member] \| Unsecured Senior Notes, 4.60% [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate		0.25%
Debt Instrument, Face Amount		$ 1,000,000,000
Debt Instrument, Interest Rate, Stated Percentage		4.60%
Debt Issuance Cost		$ (10,000,000)
Long-term Debt, Fair Value						1,000,000,000
Debt Instrument, Annual Principal Payment		$ 0
Debt Instrument, Redemption Price, Specific Event, Percentage		101.00%
Senior Notes [Member] \| Unsecured Senior Notes, 4.60% [Member] \| Debt Instrument, Redemption, Period One [Member]
Debt Instrument [Line Items]
Debt Instrument, Redemption Price, Percentage		100.00%
British Pound Denominated Term Loan [Member]
Debt Instrument [Line Items]
Long-term Debt						235,808,000		0
Euro Denominated Bank Term Loan [Member]
Debt Instrument [Line Items]
Long-term Debt						114,030,000		133,067,000
Yen Denominated Term Loan [Member]
Debt Instrument [Line Items]
Long-term Debt						49,875,000		0
Canadian Dollar Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Long-term Debt						108,389,000		$ 146,325,000
Term Loan [Member] \| Yen Denominated Term Loan [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount						$ 50,000,000						¥ 6,000,000,000
Debt Instrument, Annual Principal Payment \| ¥												¥ 2,000,000,000
Debt, Weighted Average Interest Rate						0.83%					0.83%	0.83%
Number Of Debt Agreements \| debt_agreement						2					2	2
Term Loan [Member] \| Euro Denominated Bank Term Loan [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount \| £											£ 120,000,000
Debt, Weighted Average Interest Rate						1.70%					1.70%	1.70%
Semi annual payments \| £			£ 2,500,000.0
Term Loan [Member] \| British Pound Denominated Term Loan [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount \| £	160,000,000
Debt, Weighted Average Interest Rate						1.26%					1.26%	1.26%
Semi annual payments \| £	£ 4,000,000
Debt Instrument, Term	5 years
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Debt Instrument, Annual Principal Payment													$ 0
Debt, Weighted Average Interest Rate						1.60%					1.60%	1.60%
Debt Instrument, Maturity Date					Sep. 24, 2019
Line of Credit Facility, Initiation Date					Sep. 29, 2014
Line of Credit Facility, Maximum Borrowing Capacity \| CAD					CAD 175
Line of Credit Facility, Commitment Fee Percentage					0.07%
Proceeds from Lines of Credit \| CAD							CAD 150		CAD 170