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Goodwill and Other Intangible Asset Table - Additional Information (Detail) (USD $)
 12 Months Ended
May 31, 2013
May 31, 2012
May 31, 2011
Goodwill And Other Intangible Asset [Line Items]      
Non-amortizable intangible assets $ 6,660,000 $ 5,270,000  
Amortization expense for intangible assets 2,994,000 2,527,000 2,144,000
Estimated amortization expense for period, 2014 3,070,000    
Estimated amortization expense for period, 2015 2,808,000    
Estimated amortization expense for period, 2016 2,568,000    
Estimated amortization expense for period, 2017 2,231,000    
Estimated amortization expense for period, 2018 2,048,000    
Minimum
      
Goodwill And Other Intangible Asset [Line Items]      
Amortizable intangible assets useful lives 5 years    
Maximum
      
Goodwill And Other Intangible Asset [Line Items]      
Amortizable intangible assets useful lives 20 years    
Licenses
      
Goodwill And Other Intangible Asset [Line Items]      
Non-amortizable intangible assets 569,000 555,000  
Trademarks
      
Goodwill And Other Intangible Asset [Line Items]      
Non-amortizable intangible assets 4,867,000 3,491,000  
Non-amortizable customer based intangibles
      
Goodwill And Other Intangible Asset [Line Items]      
Non-amortizable intangible assets $ 1,224,000 $ 1,224,000  
License | Minimum
      
Goodwill And Other Intangible Asset [Line Items]      
Amortizable intangible assets useful lives 5 years    
License | Maximum
      
Goodwill And Other Intangible Asset [Line Items]      
Amortizable intangible assets useful lives 20 years    
Noncompete Agreements
      
Goodwill And Other Intangible Asset [Line Items]      
Amortizable intangible assets useful lives 5 years    
Patents | Minimum
      
Goodwill And Other Intangible Asset [Line Items]      
Amortizable intangible assets useful lives 5 years    
Patents | Maximum
      
Goodwill And Other Intangible Asset [Line Items]      
Amortizable intangible assets useful lives 20 years    
Customer Relationships
      
Goodwill And Other Intangible Asset [Line Items]      
Amortizable intangible assets useful lives 12 years 12 years  
Customer Relationships | Minimum
      
Goodwill And Other Intangible Asset [Line Items]      
Amortizable intangible assets useful lives 12 years    
Customer Relationships | Maximum
      
Goodwill And Other Intangible Asset [Line Items]      
Amortizable intangible assets useful lives 20 years