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Acquisitions - Purchase Price Allocation (Details) - USD ($)
$ in Millions
Jan. 26, 2019
Jul. 29, 2017
Jul. 30, 2016
Business Acquisition [Line Items]      
Accounts receivable $ 5.6 $ 8.9 $ 16.9
Costs and estimated earnings in excess of billings 0.0 2.4 21.8
Inventories and other current assets 0.2 0.2 15.0
Property and equipment 0.5 5.6 11.5
Goodwill 4.0 10.1 39.9
Total assets 22.6 37.7 201.4
Accounts payable 2.2 3.2 23.7
Accrued and other current liabilities 0.0 3.4 22.3
Deferred tax liabilities, net non-current 0.0 5.0 0.0
Total liabilities 2.2 11.6 46.0
Customer relationships      
Business Acquisition [Line Items]      
Intangible assets 12.3 9.8 94.5
Trade names      
Business Acquisition [Line Items]      
Intangible assets 0.0 0.7 1.8
Current Year Acquisitions [Member]      
Business Acquisition [Line Items]      
Net Assets Acquired $ 20.4 $ 26.1 $ 155.4