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 9 Months Ended
Feb. 28, 2014
Feb. 28, 2013
Feb. 28, 2014
Feb. 28, 2013
May 31, 2013
Goodwill and Intangible Assets, Net of Accumulated Amortization (Textual)          
Goodwill $ 540.0   $ 540.0   $ 533.9
Amortization expense relating to intangible assets $ 4.2 $ 4.9 $ 11.7 $ 14.3