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Goodwill and Intangible Assets (Tables)
6 Months Ended
Nov. 30, 2012
Goodwill and Intangible Assets [Abstract]  
Goodwill by segment
         

Balance, May 31, 2012

  $  308,912  

Adjustments to purchase price

    (1,741

Goodwill acquired from Vortex

    30,019  
   

 

 

 

Balance, November 30, 2012

  $ 337,190  
   

 

 

 
Intangible assets
                                 
    November 30,2012  
    Gross carrying
value
    Accumulated
amortization
    Net carrying
value
    Weighted
avg useful
life
 
          (in thousands)           (years)  

Product technologies

  $ 140,324     $ (21,949   $ 118,375       13.3  

Customer relationships

    82,216       (26,344     55,872       14.8  

Trademark-NAMIC

    28,600       —         28,600       Indefinite  

In-process R&D acquired

    3,000       —         3,000       Indefinite  

Licenses

    6,302       (4,093     2,209       8.8  

Trademarks

    4,575       (568     4,007       9.9  

Distributor relationships

    1,140       (900     240       2.6  
   

 

 

   

 

 

   

 

 

         
    $ 266,157     $ (53,854   $ 212,303          
   

 

 

   

 

 

   

 

 

         

 

                                 
    May 31, 2012  
    Gross
carrying
value
    Accumulated
amortization
    Net
carrying
value
    Weighted
avg useful
life
 
          (in thousands)           (years)  

Customer relationships

  $ 82,205     $ (22,123   $ 60,082       11.7  

Product technologies

    55,540       (18,839     36,701       11.3  

Trademark-NAMIC

    28,600       —         28,600       Indefinite  

In-process R&D acquired

    15,042       —         15,042       Indefinite  

Licenses

    6,152       (3,711     2,441       9.1  

Trademarks

    4,575       (375     4,200       7.3  

Distributor relationships

    1,140       (940     200       2.6  
   

 

 

   

 

 

   

 

 

         
    $ 193,254     $ (45,988   $ 147,266