Quarterly report pursuant to Section 13 or 15(d)

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

 v2.3.0.11
Goodwill and Intangible Assets, Net of Accumulated Amortization (Details Textuals) (USD $)
In Millions
3 Months Ended
Aug. 31, 2011
Aug. 31, 2010
May 31, 2011
Goodwill and Intangible Assets, Net of Accumulated Amortization (Textuals) [Abstract]      
Goodwill $ 513.6   $ 513.7
Amortization of intangible assets $ 5.7 $ 4.7