Share-Based Compensation (Components Of Share-Based Compensation Expense) (Details) - USD ($) $ in Thousands	4 Months Ended
	Jan. 21, 2018	Jan. 22, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated share-based compensation expense	$ 2,937	$ 3,687
Nonvested stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated share-based compensation expense	1,778	2,069
Performance share awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated share-based compensation expense	663	790
Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated share-based compensation expense	482	801
Nonvested stock awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated share-based compensation expense	$ 14	$ 27