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Discontinued Operations - Additional Information (Details) - USD ($)
$ in Millions
3 Months Ended
May. 29, 2015
Aug. 31, 2015
Aug. 31, 2014
May. 31, 2015
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Consideration released from escrow   $ (2.5) $ 0.0  
Discontinued Operations | Ed Tech        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Consideration received $ 0.0      
Consideration deposited in escrow 0.0      
Working capital adjustment $ 0.0      
Consideration released from escrow   $ 2.5    
Accrued selling expenses       $ 12.2