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Goodwill (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
May 31, 2013
May 31, 2013
Changes in the carrying amount of goodwill    
Balance at the beginning of the period   $ 96,819
Goodwill acquired during the year   28,010
Adjustments to preliminary purchase price allocations   901
Goodwill impairment (9,938) (9,938)
Foreign currency translation   (522)
Balance at the end of the period 115,270 115,270
Services
   
Changes in the carrying amount of goodwill    
Balance at the beginning of the period   58,746
Goodwill acquired during the year   2,126
Adjustments to preliminary purchase price allocations   516
Foreign currency translation   (103)
Balance at the end of the period 61,285 61,285
International
   
Changes in the carrying amount of goodwill    
Balance at the beginning of the period   24,481
Goodwill acquired during the year   25,884
Adjustments to preliminary purchase price allocations   780
Goodwill impairment   (9,938)
Foreign currency translation   (419)
Balance at the end of the period 40,788 40,788
Products and Systems
   
Changes in the carrying amount of goodwill    
Balance at the beginning of the period   13,592
Adjustments to preliminary purchase price allocations   (395)
Balance at the end of the period $ 13,197 $ 13,197