Goodwill (Notes)

3 Months Ended

Mar. 31, 2017

Goodwill [Line Items]

Goodwill Disclosure [Text Block]

Goodwill

The Company performs an evaluation of goodwill, utilizing either a quantitative or qualitative impairment test, on an annual basis, or more frequently if circumstances or events require an evaluation. In connection with the segment change described in Note 11 (Segment Information), the Company performed a quantitative analysis of the legacy Corporate reporting unit's fair value prior to the allocation of goodwill to the Small Business reporting unit. Based on the results of the quantitative analysis performed as of January 1, 2017, the Company determined that the fair values of Corporate and Small Business reporting units exceeded their carrying values and no impairment existed. Using this valuation, the Company allocated the carrying value of goodwill between Small Business and Corporate based on the relative fair values determined by the quantitative test. The Public, CDW UK and Canada operating segments were not impacted by the segment change and therefore no impairment analysis was required.