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Accounting For Stock-Based Compensation (Summary Of Information Concerning Outstanding And Exercisable Options) (Details) (USD $)
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6 Months Ended |
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Jan. 31, 2015
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Jul. 31, 2014
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| Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
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| Number Outstanding |
7,573,315 |
7,197,882 |
| Weighted Average Remaining Contractual Life (Years) |
5 years 10 months 24 days |
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| Weighted Average Exercise Price |
$ 29.08 |
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| Number Exercisable |
5,756,328 |
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| Weighted Average Exercise Price |
$ 25.95 |
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| Range Of Exercise Prices $0.00 To $17.69 [Member] |
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| Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
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| Range of Exercise Prices, lower range |
$ 0.00 |
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| Range of Exercise Prices, upper range |
$ 17.69 |
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| Number Outstanding |
1,571,174 |
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| Weighted Average Remaining Contractual Life (Years) |
2 years 3 months 15 days |
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| Weighted Average Exercise Price |
$ 17.01 |
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| Number Exercisable |
1,571,174 |
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| Weighted Average Exercise Price |
$ 17.01 |
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| Range Of Exercise Prices $17.70 To $23.69 [Member] |
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| Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
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| Range of Exercise Prices, lower range |
$ 17.70 |
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| Range of Exercise Prices, upper range |
$ 23.69 |
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| Number Outstanding |
1,488,345 |
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| Weighted Average Remaining Contractual Life (Years) |
4 years 7 days |
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| Weighted Average Exercise Price |
$ 21.44 |
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| Number Exercisable |
1,488,345 |
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| Weighted Average Exercise Price |
$ 21.44 |
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| Range Of Exercise Prices $23.70 To $29.69 [Member] |
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| Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
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| Range of Exercise Prices, lower range |
$ 23.70 |
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| Range of Exercise Prices, upper range |
$ 29.69 |
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| Number Outstanding |
844,768 |
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| Weighted Average Remaining Contractual Life (Years) |
5 years 10 months 2 days |
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| Weighted Average Exercise Price |
$ 29.12 |
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| Number Exercisable |
844,768 |
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| Weighted Average Exercise Price |
$ 29.12 |
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| Range Of Exercise Prices $29.70 To $35.69 [Member] |
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| Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
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| Range of Exercise Prices, lower range |
$ 29.70 |
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| Range of Exercise Prices, upper range |
$ 35.69 |
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| Number Outstanding |
1,778,353 |
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| Weighted Average Remaining Contractual Life (Years) |
7 years 2 months 12 days |
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| Weighted Average Exercise Price |
$ 34.23 |
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| Number Exercisable |
1,506,618 |
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| Weighted Average Exercise Price |
$ 34.32 |
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| Range Of Exercise Prices $35.70 And Above [Member] |
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| Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
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| Range of Exercise Prices, lower range |
$ 35.70 |
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| Number Outstanding |
1,890,675 |
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| Weighted Average Remaining Contractual Life (Years) |
9 years 2 months 5 days |
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| Weighted Average Exercise Price |
$ 40.26 |
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| Number Exercisable |
345,423 |
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| Weighted Average Exercise Price |
$ 41.78 |
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