Quarterly report pursuant to Section 13 or 15(d)

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

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Goodwill and Intangible Assets, Net of Accumulated Amortization (Details Textual) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Feb. 29, 2016
Feb. 28, 2015
Feb. 29, 2016
Feb. 28, 2015
May. 31, 2015
Goodwill and Intangible Assets, Net of Accumulated Amortization (Textual)          
Goodwill $ 656.2   $ 656.2   $ 561.5
Amortization expense relating to intangible assets 5.3 $ 3.6 $ 11.3 $ 10.9  
Goodwill, Acquired During Period $ 94.7