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Acquisitions - Purchase Price Allocation (Details) - USD ($)
$ in Millions
Jul. 28, 2018
Jul. 29, 2017
Business Acquisition [Line Items]    
Accounts receivable $ 5.6 $ 8.9
Costs and estimated earnings in excess of billings 0.0 2.4
Inventories and other current assets 0.2 0.2
Property and equipment 0.5 5.6
Goodwill 4.0 10.1
Total assets 22.6 37.7
Accounts payable 2.2 3.2
Accrued and other current liabilities 0.0 3.4
Deferred tax liabilities, net non-current 0.0 5.0
Total liabilities 2.2 11.6
Net Assets Acquired 20.4 26.1
Customer relationships    
Business Acquisition [Line Items]    
Intangible assets 12.3 9.8
Trade names    
Business Acquisition [Line Items]    
Intangible assets $ 0.0 $ 0.7