Restaurant Impairments, Closure Costs and Asset Disposals (Narrative) (Details) $ in Thousands	3 Months Ended								12 Months Ended
	Jan. 02, 2018 USD ($) restaurant	Oct. 03, 2017 restaurant	Jul. 04, 2017 restaurant	Apr. 04, 2017 USD ($) restaurant	Jan. 03, 2017 USD ($) restaurant	Jun. 28, 2016 restaurant	Mar. 29, 2016 USD ($) restaurant	Dec. 29, 2015 restaurant	Jan. 02, 2018 USD ($) restaurant	Jan. 03, 2017 USD ($) restaurant	Dec. 29, 2015 USD ($) restaurant
Restructuring Cost and Reserve [Line Items]
Closure costs				$ 19,900			$ 200		$ 20,052	$ 2,251	$ 3,076
Number of restaurants closed | restaurant				55				16
Present value non-cancelable lease payment discount rate									4.64%
Number of restaurants impaired | restaurant	3	18	9	4	42	11	1		34	54	39
Discount Rate Using Cash Flow Analysis	10.00%
Other current liabilities
Restructuring Cost and Reserve [Line Items]
Restructuring reserve, current portion	$ 2,400				$ 900				$ 2,400	$ 900
Other long-term liabilities
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve, Noncurrent	$ 5,800				$ 1,000				$ 5,800	$ 1,000