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Amortizable of Intangible Assets (Detail) (USD $)
In Thousands, unless otherwise specified
May 31, 2013
May 31, 2012
Finite-Lived Intangible Assets And Liabilities [Line Items]    
Gross Carrying Amount $ 35,257 $ 26,530
Less Accumulated Amortization 13,668 10,255
Net Carrying Amount 21,589 16,275
License
    
Finite-Lived Intangible Assets And Liabilities [Line Items]    
Gross Carrying Amount 4,165 3,814
Less Accumulated Amortization 1,409 1,066
Net Carrying Amount 2,756 2,748
Noncompete Agreements
    
Finite-Lived Intangible Assets And Liabilities [Line Items]    
Gross Carrying Amount 334 282
Less Accumulated Amortization 186 127
Net Carrying Amount 148 155
Patents
    
Finite-Lived Intangible Assets And Liabilities [Line Items]    
Gross Carrying Amount 5,184 4,497
Less Accumulated Amortization 2,363 1,951
Net Carrying Amount 2,821 2,546
Customer Relationships
    
Finite-Lived Intangible Assets And Liabilities [Line Items]    
Gross Carrying Amount 21,791 17,212
Less Accumulated Amortization 9,446 7,109
Net Carrying Amount 12,345 10,103
Other product and service-related intangibles
    
Finite-Lived Intangible Assets And Liabilities [Line Items]    
Gross Carrying Amount 3,783 725
Less Accumulated Amortization 264 2
Net Carrying Amount $ 3,519 $ 723