Segment Reporting - Long-Term Assets by Geography (Detail) (USD $)
In Millions, unless otherwise specified
Feb. 28, 2014
May 31, 2013
Long-term assets by geography:    
Long-term assets $ 690.9 [1] $ 665.2 [1]
United States [Member]
   
Long-term assets by geography:    
Long-term assets 369.3 [1] 336.8 [1]
Europe [Member]
   
Long-term assets by geography:    
Long-term assets 247.9 [1] 255.7 [1]
International [Member]
   
Long-term assets by geography:    
Long-term assets $ 73.7 [1] $ 72.7 [1]
[1] Defined as property, plant and equipment