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, unless otherwise specified
3 Months Ended
Aug. 31, 2014
Aug. 31, 2013
May 31, 2014
Goodwill and Intangible Assets, Net of Accumulated Amortization (Textual)      
Goodwill $ 563.4   $ 540.3
Amortization expense relating to intangible assets $ 3.8 $ 3.7