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Earnings Per Share (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jan. 31, 2017
Jan. 31, 2016
Jan. 31, 2017
Jan. 31, 2016
Earnings Per Share [Abstract]        
Repurchases of common stock (in shares)     0 0
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Weighted average performance shares outstanding during the period that are excluded from EPS Calculation (in shares) 237,000 144,000 229,000 143,000
Net income for basic calculation $ 6,585,000 $ 2,476,000 $ 4,096,000 $ 3,915,000
Numerator for diluted calculation $ 6,585,000 $ 2,476,000 $ 4,096,000 $ 3,915,000
Denominator for basic calculation (in shares) 23,428,000 16,186,000 23,406,000 16,178,000
Dilutive effect on shares of stock-based awards (in shares) 17,000 19,000 21,000 23,000
Denominator for diluted calculation (in shares) 23,445,000 16,205,000 23,427,000 16,201,000
Stock options, performance shares (with the performance conditions satisfied), RSUs and restricted stock        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Anti-dilutive equity-classified stock-based awards not included in calculation of diluted earnings per share (in shares) 2,173,000 2,369,000 2,305,000 2,367,000