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Business Combinations (Tables)
 12 Months Ended
May 31, 2013
Acquisitions (Tables) [Abstract]  
Schedule of Purchase Price Allocation
Current assets $ 145
Property and equipment   91
Goodwill   351
Intangible assets    60
Other non-current assets   70
Current liabilities   (174)
Long-term liabilities   (36)
Total purchase price $ 507