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Basis of Presentation and Accounting Policies - Other Assets (Details) - USD ($)
$ in Millions
Jul. 29, 2017
Jul. 30, 2016
Condensed Balance Sheet Statements, Captions [Line Items]    
Debt issuance costs, net $ 4.8 $ 6.4
Prepaid expense and other assets 9.9 12.7
Restricted cash and cash equivalents 5.4 5.0
Investments and other noncurrent assets 4.0 4.0
Other Noncurrent assets    
Condensed Balance Sheet Statements, Captions [Line Items]    
Insurance recoveries/receivables related to accrued claims $ 9.2 $ 5.7