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Goodwill and Other Intangibles (Details) - Schedule of other intangible assets subject to amortization - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Aug. 31, 2016
Aug. 31, 2015
May 31, 2016
Intangible Assets, Net (Excluding Goodwill) [Abstract]      
Accumulated amortization $ 20.1 $ 17.8 $ 19.5
Finite-lived Intangible Assets [Roll Forward]      
Beginning balance - Other intangibles subject to amortization 4.7 4.7 4.7
Additions 0.2 0.5 2.4
Amortization expense (0.6) (0.5) (2.2)
Foreign currency translation (0.1) 0.0 (0.2)
Total other intangibles subject to amortization, net of accumulated amortization of $20.1, $19.5 and $17.8, respectively 4.2 4.7 4.7
Total other intangibles not subject to amortization 2.1 2.1 2.1
Total other intangibles $ 6.3 $ 6.8 $ 6.8