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, 2013
Aug. 31, 2012
May 31, 2013
Goodwill and Intangible Assets, Net of Accumulated Amortization (Textual)      
Goodwill $ 533.9   $ 533.9
Amortization expense relating to intangible assets $ 3.7 $ 4.7