Impairment and other charges, net Restructuring cost (Details) - USD ($) $ in Thousands		4 Months Ended
		Jan. 20, 2019	Jan. 21, 2018
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Expected Cost Remaining		$ 1,600
Restructuring Costs		5,840	$ 358
Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Costs	[1]	4,506	(456)
Strategic Alternative Evaluation [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Costs	[2]	1,334	0
Qdoba evaluation cost [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Costs	[3]	0	813
Other Restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Costs		$ 0	$ 1

[1] 2018 reflects a reduction in severance and related costs due to a change in the number of employees to be terminated in connection with our restructuring activities.

[2] Strategic Alternative Evaluation costs are primarily related to third party advisory services.

[3] Qdoba Evaluation costs are primarily related to retention compensation and third party advisory services.