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Discontinued Operations (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
May 29, 2015
Feb. 29, 2016
May 31, 2016
May 31, 2015
May 31, 2014
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Restricted cash held in escrow     $ 9.9 $ 34.5  
Working capital adjustment   $ 2.9      
Restricted cash released     (24.6) 34.5 $ 0.0
Proceeds from sale of assets     3.3 0.7 $ 1.3
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        
Working capital adjustment/Proceeds from sale of discontinued assets 577.7        
Restricted cash held in escrow 34.5        
Working capital adjustment 2.7 $ 2.9      
Carrying value of net assets sold $ 123.7        
Restricted cash released     24.6    
Restricted cash,to be released upon fulfillment of services agreement     4.9    
Restricted cash to be released barring breach of representations     $ 5.0    
Accrued selling costs       $ 0.0