Other Expense (Income) - Net (Details) - USD ($) $ in Thousands	3 Months Ended						4 Months Ended		12 Months Ended
	Sep. 07, 2019	Jun. 15, 2019	Mar. 23, 2019	Sep. 08, 2018	Jun. 16, 2018	Mar. 24, 2018	Dec. 28, 2019	Dec. 29, 2018	Dec. 28, 2019	Dec. 29, 2018	Dec. 30, 2017
Loss Contingencies [Line Items]
Other income (expense)	$ (1,021)	$ (1,514)	$ 58	$ (253)	$ (341)	$ (389)	$ (11,013)	$ (623)	$ (13,490)	$ (1,606)	$ 10,940
Settlement of a class action lawsuit
Loss Contingencies [Line Items]
Other income (expense)							$ (11,000)
Site closure costs
Loss Contingencies [Line Items]
Other income (expense)									$ (2,700)	$ (1,000)