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Accounting for Stock-Based Compensation (Summary Of Information Concerning Outstanding And Exercisable Options) (Details) - $ / shares | 9 Months Ended |
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Apr. 30, 2016 | Jul. 31, 2015
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |
Number Outstanding (in shares) | 7,125,232 | 7,191,442
Weighted Average Remaining Contractual Life (Years) | 5 years 8 months 5 days |
Weighted Average Exercise Price of Outstanding Options (in usd per share) | $ 29.75 |
Number Exercisable (in shares) | 5,348,294 |
Weighted Average Exercise Price of Exercisable Options(in usd per share) | $ 28.48 |
Range Of Exercise Prices $0.00 To $17.69 |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |
Range of Exercise Prices, lower range (in usd per share) | 0 |
Range of Exercise Prices, upper range (in usd per share) | $ 17.69 |
Number Outstanding (in shares) | 877,972 |
Weighted Average Remaining Contractual Life (Years) | 1 year 9 months 29 days |
Weighted Average Exercise Price of Outstanding Options (in usd per share) | $ 17.20 |
Number Exercisable (in shares) | 877,972 |
Weighted Average Exercise Price of Exercisable Options(in usd per share) | $ 17.20 |
Range Of Exercise Prices $17.70 To $23.69 |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |
Range of Exercise Prices, lower range (in usd per share) | 17.70 |
Range of Exercise Prices, upper range (in usd per share) | $ 23.69 |
Number Outstanding (in shares) | 1,359,206 |
Weighted Average Remaining Contractual Life (Years) | 2 years 9 months 15 days |
Weighted Average Exercise Price of Outstanding Options (in usd per share) | $ 21.47 |
Number Exercisable (in shares) | 1,359,206 |
Weighted Average Exercise Price of Exercisable Options(in usd per share) | $ 21.47 |
Range Of Exercise Prices $23.70 To $29.69 |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |
Range of Exercise Prices, lower range (in usd per share) | 23.70 |
Range of Exercise Prices, upper range (in usd per share) | $ 29.69 |
Number Outstanding (in shares) | 1,668,035 |
Weighted Average Remaining Contractual Life (Years) | 7 years 4 months 10 days |
Weighted Average Exercise Price of Outstanding Options (in usd per share) | $ 28.55 |
Number Exercisable (in shares) | 752,435 |
Weighted Average Exercise Price of Exercisable Options(in usd per share) | $ 29.13 |
Range Of Exercise Prices $29.70 To $35.69 |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |
Range of Exercise Prices, lower range (in usd per share) | 29.70 |
Range of Exercise Prices, upper range (in usd per share) | $ 35.69 |
Number Outstanding (in shares) | 1,569,644 |
Weighted Average Remaining Contractual Life (Years) | 6 years 7 days |
Weighted Average Exercise Price of Outstanding Options (in usd per share) | $ 34.22 |
Number Exercisable (in shares) | 1,542,877 |
Weighted Average Exercise Price of Exercisable Options(in usd per share) | $ 34.26 |
Range Of Exercise Prices $35.70 And Above |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |
Range of Exercise Prices, lower range (in usd per share) | $ 35.70 |
Number Outstanding (in shares) | 1,650,375 |
Weighted Average Remaining Contractual Life (Years) | 8 years 29 days |
Weighted Average Exercise Price of Outstanding Options (in usd per share) | $ 40.20 |
Number Exercisable (in shares) | 815,804 |
Weighted Average Exercise Price of Exercisable Options(in usd per share) | $ 40.80 |

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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 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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