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Accounting For Stock-Based Compensation (Narrative) (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified
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3 Months Ended |
6 Months Ended |
|
Jan. 31, 2015
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Jan. 31, 2014
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Jan. 31, 2015
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Jan. 31, 2014
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Pre-tax stock-based compensation expense associated with stock options |
$ 5.6 |
$ 4.7 |
$ 6.9 |
$ 6.1 |
| Tax benefit associated with stock options |
1.9 |
1.6 |
2.3 |
2.0 |
| Weighted average fair value for options granted, per share |
|
|
$ 9.95 |
$ 11.60 |
| Total intrinsic value of options exercised |
|
|
13.4 |
15.9 |
| Aggregate intrinsic value of options outstanding |
63.7 |
|
63.7 |
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| Aggregate intrinsic value of options exercisable |
62.9 |
|
62.9 |
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| Annual dividend yield |
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|
1.60% |
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| 2010 Master Stock Incentive Plan [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Unrecognized compensation expense related to non-vested stock options granted |
$ 10.5 |
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$ 10.5 |
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| Minimum [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Options exercisable from date of the grant, in years |
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|
1 year |
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| Expected volatility |
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18.60% |
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| Risk-free interest rate |
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|
0.05% |
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| Maximum [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Options exercisable from date of the grant, in years |
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8 years |
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| Expected volatility |
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26.70% |
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| Risk-free interest rate |
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|
2.27% |
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