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Stock-Based Compensation - Stock Options (Details) - USD ($) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Apr. 30, 2016 | Jan. 31, 2016 | Oct. 31, 2015 | Apr. 30, 2015 | Apr. 30, 2016 | Apr. 30, 2015
Additional Disclosures |  |  |  |  |  |
Targeted annual dividend per share (in dollars per share) |  |  |  |  | $ 1.20 | $ 1.20
Stock Options |  |  |  |  |  |
Awards (in Shares) |  |  |  |  |  |
Outstanding, Beginning Balance (in shares) | 2,350,258 | 2,398,498 | 2,119,683 |  | 2,119,683 |
Granted (in shares) | 43,000 | 10,000 | 480,265 |  |  |
Expired/canceled (in shares) | (31,060) | (58,240) | (182,250) |  |  |
Exercised (in shares) | 0 |  | (19,200) |  |  |
Outstanding, Ending Balance (in shares) | 2,362,198 | 2,350,258 | 2,398,498 |  | 2,362,198 |
Exercisable, Ending Balance (in shares) | 1,042,962 |  |  |  | 1,042,962 |
Vested and Expected to Vest, Ending Balance (in shares) | 2,287,266 |  |  |  | 2,287,266 |
Weighted Average Exercise Price |  |  |  |  |  |
Outstanding, Beginning Balance (in dollars per share) | $ 29.01 | $ 29.04 | $ 29.33 |  | $ 29.33 |
Granted (in dollars per share) | 21.50 | 20.90 | 28.00 |  |  |
Expired/canceled (in dollars per share) | 29.34 | 28.84 | 29.84 |  |  |
Exercised (in dollars per share) |  |  | 27.24 |  |  |
Outstanding, Ending Balance (in dollars per share) | 28.87 | $ 29.01 | $ 29.04 |  | 28.87 |
Exercisable, Ending Balance (in dollars per share) | 28.59 |  |  |  | 28.59 |
Vested and Expected to Vest, Ending Balance (in dollars per share) | $ 28.85 |  |  |  | $ 28.85 |
Weighted Average Remaining Contractual Term (Years) |  |  |  |  |  |
Outstanding, Ending Balance |  |  |  |  | 6 years 8 months 12 days |
Exercisable, Ending Balance |  |  |  |  | 5 years 2 months 1 day |
Vested And Expected To Vest, Ending Balance |  |  |  |  | 6 years 7 months 24 days |
Aggregate Intrinsic Value |  |  |  |  |  |
Outstanding, Ending Balance | $ 149,000 |  |  |  | $ 149,000 |
Exercisable, Ending Balance | 0 |  |  |  | 0 |
Vested and Expected to Vest, Ending Balance | $ 142,000 |  |  |  | $ 142,000 |
Additional Disclosures |  |  |  |  |  |
Exercise price, lower range limit (in dollars per share) |  |  |  |  | $ 20.90 |
Exercise price, upper range limit (in dollars per share) |  |  |  |  | $ 33.94 |
Total intrinsic value of stock-based awards settled |  |  |  | $ 265,000 | $ 32,000 | $ 2,224,000
Vested Stock Based Awards Net Settled Upon Exercise (in shares) |  |  |  |  | 19,200 | 293,988
Stock Issued During The Period, Shares, Net Settlement Of Stock-Based Awards |  |  |  |  | 706 | 47,532
Per share weighted average grant date fair value of stock based awards granted (in dollars per share) | $ 3.95 |  |  | $ 4.53 | $ 5.55 | $ 6.13
Fair Value Assumptions |  |  |  |  |  |
Expected dividend yield | 5.58% |  |  | 4.09% | 4.42% | 3.55%
Expected volatility | 35.80% |  |  | 27.00% | 34.39% | 28.12%
Risk-free interest rate | 1.39% |  |  | 1.37% | 1.53% | 1.61%
Expected life (years) | 5 years 15 days |  |  | 5 years 2 months 19 days | 5 years 1 month 24 days | 5 years 5 months 12 days
Minimum | Stock Options |  |  |  |  |  |
Additional Disclosures |  |  |  |  |  |
Contractual term (in years) |  |  |  |  | 5 years | 5 years
Vesting period (in years) |  |  |  |  | 3 years |
Maximum | Stock Options |  |  |  |  |  |
Additional Disclosures |  |  |  |  |  |
Contractual term (in years) |  |  |  |  | 10 years | 10 years
Vesting period (in years) |  |  |  |  | 5 years |
Granted since fiscal 2014 | Performance shares |  |  |  |  |  |
Additional Disclosures |  |  |  |  |  |
Vesting period (in years) |  |  |  |  |  | 3 years

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