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SEGMENTS AND RELATED INFORMATION - SEGMENTS AND RELATED INFORMATION (Details)	Dec. 31, 2016 stockkeepingunits products
Segment Reporting [Abstract]
Product stock keeping units (in stock keeping units) | stockkeepingunits	230,000
Products (in products) | products	1,000,000

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- References

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- Definition

Product Stock Keeping Units

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No definition available.

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- Definition

Products

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No definition available.

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Name:	wcc_Products
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Period Type:	instant