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Changes in Carrying Amount of Goodwill, by Reportable Segment (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
May 31, 2012
May 31, 2011
Goodwill [Line Items]    
Goodwill beginning balance $ 831,489 $ 768,244
Acquisitions 55,177 16,265
Purchase accounting adjustments   1,586 [1]
Translation adjustments (37,320) 45,394
Goodwill ending balance 849,346 831,489
Industrial Segment
   
Goodwill [Line Items]    
Goodwill beginning balance 445,756 392,850
Acquisitions 50,233 16,265
Purchase accounting adjustments   1,586 [1]
Translation adjustments (30,098) 35,055
Goodwill ending balance 465,891 445,756
Consumer Segment
   
Goodwill [Line Items]    
Goodwill beginning balance 385,733 375,394
Acquisitions 4,944  
Translation adjustments (7,222) 10,339
Goodwill ending balance $ 383,455 $ 385,733
[1] Relates primarily to other accruals and finalization of certain property, plant and equipment and intangibles valuations; and current year adjustments to purchase price contingencies.