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REVENUE (Tables)

3 Months Ended

Mar. 31, 2018

Revenue from Contract with Customer [Abstract]

Disaggregation of Revenue [Table Text Block]

The following tables disaggregate WESCO’s revenue by end market and geography:

	Three Months Ended
	March 31,
(In thousands)	2018				2017
Industrial	$	758,976			$	678,292
Construction	637,800				571,636
Utility	315,546				266,259
Commercial, Institutional and Government ("CIG")	281,593				256,404
Total by end market	$	1,993,915			$	1,772,591

	Three Months Ended
	March 31,
(In thousands)	2018				2017
United States	$	1,482,718			$	1,343,217
Other (1)	511,197				429,374
Total by geography	$	1,993,915			$	1,772,591

⁽¹⁾  Other primarily includes net sales to customers in Canada.

Revenue Recognition, Revenue Reductions [Policy Text Block]

WESCO’s revenues are adjusted for variable consideration, which includes customer volume rebates, returns, and discounts. WESCO measures variable consideration by estimating expected outcomes using analysis and inputs based upon anticipated performance, historical data, as well as current and forecasted information. Measurement and recognition of variable consideration is reviewed by management on a monthly basis and revenue is adjusted accordingly. Variable consideration reduced revenue for the three months ended March 31, 2018 and 2017 by approximately $23.8 million and $20.0 million, respectively.

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- Definition

Tabular disclosure of disaggregation of revenue into categories depicting how nature, amount, timing, and uncertainty of revenue and cash flows are affected by economic factor.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=82913847&loc=SL49130545-203045

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X

- Definition

Disclosure of accounting policy of sales arrangements for goods or services that reduce the amount of revenue recognized for example sales returns, allowances, incentives, rebates, discounts and loyalty programs.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 605
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 13.B.Q1)
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 605
-SubTopic 50
-Section 25
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