Quarterly report pursuant to Section 13 or 15(d)

Goodwill and Intangible Assets, Net of Accumulated Amortization (Narrative) (Details)

v3.5.0.2
Goodwill and Intangible Assets, Net of Accumulated Amortization (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended
Aug. 31, 2016
Aug. 31, 2015
May 31, 2016
Goodwill and Intangible Assets, Net of Accumulated Amortization [Abstract]      
Goodwill $ 657.1   $ 657.1
Amortization expense $ 4.4 $ 3.0