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Earnings Per Share (Details 1)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Apr. 30, 2015
Apr. 30, 2014
Apr. 30, 2015
Apr. 30, 2014
Stock options excluded from the diluted earnings per share computations        
Stock options excluded from the calculation of diluted earnings per share 15us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 98us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 166us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 61us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount