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Discontinued Operations (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
May. 29, 2015
May. 31, 2013
May. 31, 2015
May. 31, 2014
May. 31, 2013
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Proceeds from sale of discontinued assets     $ 577.7 $ 0.0 $ 0.0
Restricted cash held in escrow     34.5 0.0  
Proceeds from sale of assets     0.7 $ 1.3 $ 0.0
Discontinued Operations [Member]          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Proceeds from sale of assets   $ 5.0      
Loss on sale of equipment   $ 1.1      
Discontinued Operations [Member] | ED Tech [Member]          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Consideration received $ 575.0        
Proceeds from sale of discontinued assets 577.7        
Restricted cash held in escrow 34.5        
Working capital adjustment 2.7        
Carrying value of net assets sold $ 123.7        
Accrued selling costs     $ 12.2