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Stock Option Plans (Summary Of Information Concerning Outstanding And Exercisable Options) (Details) - $ / shares | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Jul. 31, 2015 | Jul. 31, 2014 | Jul. 31, 2013 | Jul. 31, 2012
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |
Number Outstanding | 7,191,442 | 7,197,882 | 7,329,820 | 8,056,327
Weighted Average Remaining Contractual Life (Years) | 5 years 6 months |  |  |
Weighted Average Exercise Price | $ 29.38 |  |  |
Number Exercisable | 5,434,302 |  |  |
Weighted Average Exercise Price | $ 26.29 |  |  |
Range Three [Member] |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |
Range of Exercise Prices, lower range | 23.70 |  |  |
Range of Exercise Prices, upper range | $ 29.69 |  |  |
Number Outstanding | 821,268 |  |  |
Weighted Average Remaining Contractual Life (Years) | 5 years 4 months 2 days |  |  |
Weighted Average Exercise Price | $ 29.12 |  |  |
Number Exercisable | 821,268 |  |  |
Weighted Average Exercise Price | $ 29.12 |  |  |
Range One [Member] |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |
Range of Exercise Prices, lower range | 0.00 |  |  |
Range of Exercise Prices, upper range | $ 17.69 |  |  |
Number Outstanding | 1,366,763 |  |  |
Weighted Average Remaining Contractual Life (Years) | 1 year 11 months 12 days |  |  |
Weighted Average Exercise Price | $ 17.08 |  |  |
Number Exercisable | 1,366,763 |  |  |
Weighted Average Exercise Price | $ 17.08 |  |  |
Range Four [Member] |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |
Range of Exercise Prices, lower range | 29.70 |  |  |
Range of Exercise Prices, upper range | $ 35.69 |  |  |
Number Outstanding | 1,719,689 |  |  |
Weighted Average Remaining Contractual Life (Years) | 6 years 7 months 24 days |  |  |
Weighted Average Exercise Price | $ 34.23 |  |  |
Number Exercisable | 1,463,974 |  |  |
Weighted Average Exercise Price | $ 34.32 |  |  |
Range Five [Member] |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |
Range of Exercise Prices, lower range | $ 35.70 |  |  |
Number Outstanding | 1,850,927 |  |  |
Weighted Average Remaining Contractual Life (Years) | 8 years 8 months 1 day |  |  |
Weighted Average Exercise Price | $ 40.22 |  |  |
Number Exercisable | 349,502 |  |  |
Weighted Average Exercise Price | $ 41.76 |  |  |
Range Two [Member] |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |
Range of Exercise Prices, lower range | 17.70 |  |  |
Range of Exercise Prices, upper range | $ 23.69 |  |  |
Number Outstanding | 1,432,795 |  |  |
Weighted Average Remaining Contractual Life (Years) | 3 years 6 months 7 days |  |  |
Weighted Average Exercise Price | $ 21.47 |  |  |
Number Exercisable | 1,432,795 |  |  |
Weighted Average Exercise Price | $ 21.47 |  |  |

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- Definition The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan. + 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)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range. + 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 (g) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The ceiling of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range. + 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 (g) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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 Weighted average exercise price as of the balance sheet date for those equity-based payment arrangements exercisable and 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 (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average price as of the balance sheet date at which grantees could acquire the underlying shares with respect to all outstanding stock options which are in the customized range of exercise prices. + 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)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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