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Amortizable of Intangible Assets (Detail) (USD $)
In Thousands, unless otherwise specified
May 31, 2014
May 31, 2013
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount $ 54,143 $ 35,283
Less Accumulated Amortization 17,409 13,668
Net Carrying Amount 36,734 21,615
Licenses
   
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 6,701 4,165
Less Accumulated Amortization 1,873 1,409
Net Carrying Amount 4,828 2,756
Noncompete Agreements
   
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 474 334
Less Accumulated Amortization 256 186
Net Carrying Amount 218 148
Patents
   
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 5,990 5,184
Less Accumulated Amortization 2,746 2,363
Net Carrying Amount 3,244 2,821
Customer Relationships
   
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 37,145 21,791
Less Accumulated Amortization 11,915 9,446
Net Carrying Amount 25,230 12,345
Other product and service-related intangibles
   
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 3,833 3,809
Less Accumulated Amortization 619 264
Net Carrying Amount $ 3,214 $ 3,545