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Acquisitions - Purchase Price Allocation (Details) - USD ($)
$ in Millions
Jul. 29, 2017
Jul. 30, 2016
Business Acquisition [Line Items]    
Accounts receivable $ 8.9 $ 16.9
Costs and estimated earnings in excess of billings 2.4 21.8
Inventories and other current assets 0.2 15.0
Property and equipment 5.6 11.5
Goodwill 10.1 39.9
Total assets 37.7 201.4
Accounts payable 3.2 23.7
Accrued and other current liabilities 3.4 22.3
Deferred tax liabilities, net non-current 5.0 0.0
Total liabilities 11.6 46.0
Net Assets Acquired 26.1 155.4
Customer relationships    
Business Acquisition [Line Items]    
Intangible assets 9.8 94.5
Trade names    
Business Acquisition [Line Items]    
Intangible assets $ 0.7 $ 1.8