{"cik":1402057,"taxonomy":"us-gaap","tag":"StockholdersEquityNoteStockSplitConversionRatio1","label":"Stockholders' Equity Note, Stock Split, Conversion Ratio","description":"Ratio applied to the conversion of stock split, for example but not limited to, one share converted to two or two shares converted to one.","entityName":"CDW CORP","units":{"pure":[{"start":"2013-06-01","end":"2013-06-30","val":143.03,"accn":"0001402057-14-000002","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-05"},{"start":"2013-06-01","end":"2013-06-30","val":143.03,"accn":"0001402057-14-000005","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-12"},{"start":"2013-06-01","end":"2013-06-30","val":143.029961,"accn":"0001445305-14-003628","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-13"},{"start":"2013-06-01","end":"2013-06-30","val":143.029961,"accn":"0001402057-14-000011","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12"},{"start":"2013-06-01","end":"2013-06-30","val":143.029961,"accn":"0001402057-15-000003","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-26","frame":"CY2013Q2I"}]}}