Credit Agreement (Details) - Subsequent event $ in Millions	Jul. 31, 2015 USD ($)
Revolving line of credit
Credit agreement
Maximum borrowing capacity	$ 10.0
Wayfair, Inc. | July 31, 2015 through September 30, 2015 | Line of credit
Credit agreement
Maximum borrowing capacity	35.0
Wayfair, Inc. | October 1, 2015 through February 28, 2016 | Line of credit
Credit agreement
Maximum borrowing capacity	45.0
Wayfair, Inc. | March 1, 2016 through July 31, 2016 | Line of credit
Credit agreement
Maximum borrowing capacity	$ 35.0