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Acquisitions and Divestitures - Narrative - Fiscal 2014 Divestitures (Details)
$ in Millions
3 Months Ended 12 Months Ended
Feb. 10, 2014
USD ($)
investment
May. 03, 2014
USD ($)
investment
May. 02, 2015
USD ($)
May. 03, 2014
USD ($)
Apr. 27, 2013
USD ($)
Business Acquisition [Line Items]          
Sale of investment     $ 11.2 $ 6.1 $ 0.0
Lumidigm          
Business Acquisition [Line Items]          
Number of investments | investment 1 1      
Cost basis $ 4.1        
Sale of investment 7.3        
Pre-tax gain on sale of investment 3.2 $ 3.2      
Amount held in escrow $ 1.1