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Stock Option Plans (Tables) | 12 Months Ended
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Jul. 31, 2015
Share-based Compensation [Abstract] |
Weighted Average Assumptions For Recognized Fair Value Of Stock-Based Employee Compensation Cost |
| 2015 |  | 2014 |  | 2013
Risk - free interest rate | 0.05 - 2.3% |  | 0.31 - 2.8% |  | 0.02 - 1.7%
Expected volatility | 18.6 - 26.7% |  | 18.2 - 28.0% |  | 22.5 - 29.7%
Expected dividend yield | 1.6% |  | 1.4 - 1.6% |  | 1.0 - 1.4%
Expected life |  |  |  |  |
Director and officer grants | 8 years |  | 8 years |  | 8 years
Non - officer original grants | 7 years |  | 7 years |  | 7 years
Reload grants | <4 years |  | <6 years |  | <5 years
Stock Option Activity |
|  |  | Weighted
| Options |  | Average Exercise
| Outstanding |  | Price
Outstanding at July 31, 2012 | 8,056,327 |  | $ | 20.97
Granted | 965,050 |  |  | 33.91
Exercised | (1,607,081) |  |  | 14.79
Canceled | (84,476) |  |  | 33.94
Outstanding at July 31, 2013 | 7,329,820 |  |  | 23.88
Granted | 900,073 |  |  | 42.17
Exercised | (1,008,848) |  |  | 18.80
Canceled | (23,163) |  |  | 34.02
Outstanding at July 31, 2014 | 7,197,882 |  |  | 26.84
Granted | 1,023,836 |  |  | 38.58
Exercised | (916,566) |  |  | 18.54
Canceled | (113,710) |  |  | 38.67
Outstanding at July 31, 2015 | 7,191,442 |  |  | 29.38
Outstanding And Exercisable Options |
|  |  |  | Weighted |  |  |  |  |  |  |  |
|  |  |  | Average |  | Weighted |  |  |  | Weighted
|  |  |  | Remaining |  | Average |  |  |  | Average
|  | Number |  | Contractual |  | Exercise |  | Number |  | Exercise
Range of Exercise Prices |  | Outstanding |  | Life (Years) |  | Price |  | Exercisable |  | Price
$0.00 to $17.69 |  | 1,366,763 |  | 1.95 |  | $ | 17.08 |  | 1,366,763 |  | $ | 17.08
$17.70 to $23.69 |  | 1,432,795 |  | 3.52 |  |  | 21.47 |  | 1,432,795 |  |  | 21.47
$23.70 to $29.69 |  | 821,268 |  | 5.34 |  |  | 29.12 |  | 821,268 |  |  | 29.12
$29.70 to $35.69 |  | 1,719,689 |  | 6.65 |  |  | 34.23 |  | 1,463,974 |  |  | 34.32
$35.70 and above |  | 1,850,927 |  | 8.67 |  |  | 40.22 |  | 349,502 |  |  | 41.76
|  | 7,191,442 |  | 5.50 |  |  | 29.38 |  | 5,434,302 |  |  | 26.29
Status For Options Which Contain Vesting Provisions |
|  |  | Weighted
|  |  | Average Grant
|  |  | Date Fair
| Options |  | Value
Non - vested at July 31, 2014 | 1,720,063 |  | $ | 10.35
Granted | 1,003,750 |  |  | 10.06
Vested | (870,930) |  |  | 10.02
Canceled | (95,743) |  |  | 10.21
Non - vested at July 31, 2015 | 1,757,140 |  |  | 10.36

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- Definition Tabular disclosure of the following for fully vested share options (or share units) and share options expected to vest at the date of the latest statement of financial position: the number, weighted-average exercise price (or conversion ratio), aggregate intrinsic value (except for nonpublic entities), and weighted-average remaining contractual term of options (or share units) outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of option exercise prices, by grouped ranges, including the upper and lower limits of the price range, the number of shares under option, weighted average exercise price and remaining contractual option terms. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired during the year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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