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Net Loss Per Share of Common Stock (Details) (Stock units and stock options to purchase common stock)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Feb. 28, 2014
Feb. 28, 2013
Feb. 28, 2014
Feb. 28, 2013
Stock units and stock options to purchase common stock
       
Securities excluded from computation of diluted net income (loss) per share of common stock        
Antidilutive securities (in shares) 645 253 709 320