Sale Leaseback Transaction (Details) $ in Thousands		12 Months Ended
	Aug. 25, 2014 USD ($) property extension	Dec. 29, 2019 USD ($)	Dec. 30, 2018 USD ($)	Dec. 31, 2017 USD ($)
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		$ 170,693	$ 174,520
Sale leaseback obligations, current portion			3,900
Net proceeds	$ 143,200
Proceeds from sale leaseback transaction	183,700	0	0	$ 4,073
Net book value		$ 81,300	$ 82,400
Conyers Sale Leaseback Transaction [Member]
Sale Leaseback Transaction [Line Items]
Net proceeds	3,900
Proceeds from sale leaseback transaction	$ 4,100