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Discontinued Operations (Details2) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Feb. 29, 2016
May 31, 2017
May 31, 2016
May 31, 2015
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Working capital adjustment $ 2.9      
Discontinued Operations [Member]        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Revenues   $ 0.4 $ 0.8 $ 229.1
Operating costs and expenses   0.9 2.7 223.3
Interest income (expense)   0.1 0.1 0.1
Gain (loss) on sale     (2.9) 454.0
Earnings (loss) before income taxes   (0.4) (4.7) 459.9
Provision (benefit) for income taxes   (0.2) (1.2) 180.8
Earnings (loss) from discontinued operations, net of tax   (0.2) (3.5) 279.1
Discontinued Operations [Member] | ED Tech [Member]        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Revenues   0.0 0.0 217.4
Operating costs and expenses   0.8 1.5 [1] 208.8 [2]
Interest income (expense)   0.0 0.0 0.0
Gain (loss) on sale     (2.9) 454.0
Earnings (loss) before income taxes   (0.8) (4.4) 462.6
Provision (benefit) for income taxes   (0.3) (1.1) 181.8
Earnings (loss) from discontinued operations, net of tax   (0.5) (3.3) 280.8
Unabsorbed overhead     15.8  
Discontinued Operations [Member] | All Other [Member]        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Revenues   0.4 0.8 11.7
Operating costs and expenses   0.1 1.2 14.5
Interest income (expense)   0.1 0.1 0.1
Gain (loss) on sale     0.0 0.0
Earnings (loss) before income taxes   0.4 (0.3) (2.7)
Provision (benefit) for income taxes   0.1 (0.1) (1.0)
Earnings (loss) from discontinued operations, net of tax   $ 0.3 $ (0.2) $ (1.7)
[1] Gain (loss) on sale included the finalization of the working capital adjustments from the sale of the Ed Tech business, resulting in a payment to the purchaser of $2.9.
[2] Operating costs and expenses included costs related to unabsorbed overhead burden associated with the former educational technology and services business of $15.8.