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Basis of Presentation and Accounting Policies Accrued Insurance Claims (Details) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Jan. 27, 2018
Jul. 29, 2017
Jul. 30, 2016
Accounting Policies [Abstract]      
Insurance recoveries for accrued insurance claims $ 6,722 $ 9,243 $ 5,714
Condensed Balance Sheet Statements, Captions [Line Items]      
Insurance recoveries for accrued insurance claims 20,423 9,243 5,714
Losses Incurred but not Recognized from Insurance Claims 53,300 50,000 45,000
Accrued Insurance 113,275 101,916 89,679
Insurance recoveries for accrued insurance claims $ 13,701 $ 0 $ 0