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Summary of Significant Accounting Policies Stock-Based Compensation (Tables) | 12 Months Ended
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Jul. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] | The weighted-average assumptions used in the Black-Scholes valuation model are reflected in the following table:
|  | 2014 |  | 2013 |  | 2012
|  | Service-Based |  | Performance-Based |  | Service-Based |  | Performance-Based |  | Service-Based |  | Performance-Based
Black-Scholes Option Valuation Assumptions |  | Option Awards |  | Option Awards |  | Option Awards |  | Option Awards |  | Option Awards |  | Option Awards
Expected term (in years) |  | 5.97 |  |  | — |  |  | 5.93 |  |  | — |  |  | 5.89 |  |  | 6.57 |
Expected volatility |  | 37.32 | % |  | — | % |  | 38.67 | % |  | — | % |  | 39.41 | % |  | 39.21 | %
Expected dividend yield |  | 2.35 | % |  | — | % |  | 2.21 | % |  | — | % |  | 2.07 | % |  | 1.99 | %
Risk-free interest rate |  | 1.80 | % |  | — | % |  | 0.91 | % |  | — | % |  | 1.16 | % |  | 2.05 | %
Weighted-average market value of underlying stock at grant date |  | $ | 30.98 |  |  | $ | — |  |  | $ | 30.58 |  |  | $ | — |  |  | $ | 27.05 |  |  | $ | 29.55 |
Weighted-average exercise price |  | $ | 30.98 |  |  | $ | — |  |  | $ | 30.58 |  |  | $ | — |  |  | $ | 27.05 |  |  | $ | 29.55 |
Weighted-average fair value of options granted during the period |  | $ | 9.17 |  |  | $ | — |  |  | $ | 9.05 |  |  | $ | — |  |  | $ | 8.42 |  |  | $ | 10.01 |

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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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