Summary of Significant Accounting Policies - Fair Value Measurements (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 27, 2017	Dec. 28, 2016	Dec. 30, 2015
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items]
Property and equipment owned, net	$ 102,794	$ 118,470
Fair Value, Measurements, Nonrecurring
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items]
Property and equipment owned, net	0	1,614	$ 0
Impairment Losses	32,594	8,400	181
Fair Value, Measurements, Nonrecurring | Level 1
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items]
Property and equipment owned, net	0	0	0
Fair Value, Measurements, Nonrecurring | Level 2
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items]
Property and equipment owned, net	0	0	0
Fair Value, Measurements, Nonrecurring | Level 3
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items]
Property and equipment owned, net	$ 0	$ 1,614	$ 0