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Earnings (Loss) Per Share - Additional Information (Detail)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Apr. 30, 2015
Apr. 30, 2014
Apr. 30, 2015
Apr. 30, 2014
Earnings Per Share [Line Items]        
Common stock equivalent shares excluded from the denominator in the calculation of diluted earnings per share 20.5us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 4.2us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 21.1us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 4.8us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount