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Quarterly Financial Data - Additional Information (Detail) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Feb. 29, 2016
Aug. 31, 2016
Aug. 31, 2015
Aug. 31, 2014
Quarterly Financial Information Disclosure [Abstract]        
Impairment charge $ 186,511 $ 186,511 $ 84,353 $ 0