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Earnings Per Share (Details) (USD $)
 3 Months Ended 6 Months Ended
Jan. 31, 2014
Jan. 31, 2013
Jan. 31, 2014
Jan. 31, 2013
Earnings Per Share [Abstract]        
Net income for basic calculation $ 5,983,000 $ 2,365,000 $ 11,288,000 $ 9,800,000
Interest expense (net of tax) on 3.0% convertible senior notes 1,117,000 0 2,234,000 2,234,000
Numerator for diluted calculation 7,100,000 2,365,000 13,522,000 12,034,000
Denominator for basic calculation (in shares) 15,970,000 17,300,000 16,212,000 17,340,000
Dilutive effect on shares of stock-based awards (in shares) 287,000 101,000 141,000 105,000
Dilutive effect on shares of conversion of 3.0% convertible senior notes (in shares) 6,230,000 0 6,199,000 5,949,000
Denominator for diluted calculation (in shares) 22,487,000 17,401,000 22,552,000 23,394,000
Weighted average performance shares outstanding during the period that are excluded from EPS calculation 92,000 35,000 70,000 35,000
Reduction in weighted average shares as a result of the repurchase of common shares 439,000 102,000 289,000 51,000
Stock-Based Awards
        
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) 573,000 2,658,000 2,308,000 2,680,000
3.0% Convertible Senior Notes
        
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)   5,992,000    
Anti-dilutive interest expense (net of tax) excluded from computation of diluted earnings per share   $ 1,117,000