Commitments and Contingencies (Details) $ in Millions	Jul. 07, 2018 item	Jun. 07, 2018 USD ($)	May 25, 2018 item	Mar. 27, 2018 item	Feb. 28, 2017 item	Feb. 03, 2017 item	Jun. 22, 2018 USD ($)
Commitments and Contingencies
Number of causes of action in the complaint, demurrer without leave to amend				6
Number of causes of action in the complaint				7
Number of additional lawsuits filed					2
Number of consolidated cases			3
Number of present and former restaurant hourly employees filed a class action lawsuit						5
Number of restaurants receiving janitorial services	8
Wage citation | $		$ 4.2
Internal Revenue Service
Commitments and Contingencies
Tax disallowance | $							$ 8.0