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Acquisitions Purchase Price Allocation (Details) - USD ($)
$ in Millions
Apr. 29, 2017
Apr. 23, 2016
Business Acquisition [Line Items]    
Accounts receivable $ 8.9 $ 16.9
Costs and estimated earnings in excess of billings 2.6 22.3
Inventories and other current assets 0.2 11.9
Property and equipment 5.6 11.5
Goodwill 10.3 41.2
Total assets 38.1 200.1
Accounts payable 3.3 23.7
Accrued and other liabilities 3.4 21.0
Deferred tax liabilities, net non-current 5.0 0.0
Total liabilities 11.7 44.7
Net Assets Acquired 26.4 155.4
Customer relationships    
Business Acquisition [Line Items]    
Intangible assets 9.8 94.5
Trade names    
Business Acquisition [Line Items]    
Intangible assets $ 0.7 $ 1.8