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Summary of Significant Accounting Policies and Practices - Acquisition of Non-Controlling Interest (Detail) - USD ($)
$ in Thousands
3 Months Ended
Aug. 31, 2015
Aug. 31, 2014
Noncontrolling Interest [Line Items]    
Carrying value of non-controlling interest at May 31, 2015 $ 6,034  
Income attributable to non-controlling interest 0  
Other comprehensive income attributable to non-controlling interest 0 $ 6
Purchase of non-controlling interest $ (6,034)