Sale Leaseback Transaction (Details) $ in Thousands			12 Months Ended
		Aug. 25, 2014 USD ($) property extension	Dec. 31, 2017 USD ($)	Jan. 01, 2017 USD ($)	Jan. 03, 2016 USD ($)
Sale Leaseback Transaction [Line Items]
Number of properties sold | property		49
Number of properties leased | property		49
Initial lease term		20 years
Number of extension options | extension		4
Duration of extension option		5 years
Sale leaseback obligations, less current portion	[1]		$ 177,933	$ 176,831
Sale leaseback obligations, current portion			2,900
Net proceeds		$ 143,200
Proceeds from sale leaseback transaction		183,700	4,073	0	$ 0
Net book value			$ 79,300	$ 81,300
Conyers Sale Leaseback Transaction [Member]
Sale Leaseback Transaction [Line Items]
Net proceeds		3,900
Proceeds from sale leaseback transaction		$ 4,100

[1] See Note 11 “Sale Leaseback Transaction” for further discussion on our sale leaseback obligations.