Quarterly report pursuant to sections 13 or 15(d)

Acquisition - Additional Information (Detail)

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Acquisition - Additional Information (Detail) (USD $)
1 Months Ended 9 Months Ended 112 Months Ended
Feb. 28, 2013
Oct. 31, 2012
Feb. 28, 2013
Feb. 28, 2013
Business Acquisition [Line Items]        
Asset purchase, cash paid   $ 3,500,000    
Intangible asset acquired $ 3,500,000   $ 3,500,000 $ 3,500,000