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Stock Option Plans (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
--- | ---
Jul. 31, 2015 | Jul. 31, 2014 | Jul. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Performance | 3 years |  |
Performance award expense | $ (354) | $ (976) | $ (1,296)
Pre-tax stock-based compensation expense associated with stock options | 9,500 | 9,900 | 8,300
Tax benefit associated with stock options | $ 3,100 | $ 3,200 | $ 2,700
Weighted average fair value for options granted, per share | $ 9.94 | $ 11.44 | $ 8.18
Total intrinsic value of options exercised | $ 18,800 | $ 21,500 | $ 33,700
Shares reserved | 11,693,263 |  |
Aggregate intrinsic value of options outstanding | $ 43,700 |  |
Aggregate intrinsic value of options exercisable | 43,700 |  |
Total fair value of shares vested | 29,300 | $ 35,500 | 29,800
Unrecognized compensation expense related to non-vested stock options granted | $ 7,500 |  |
Annual dividend yield | 1.60% |  |
Maximum [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of years of service that options were still issued with a reload provision to officers until Fiscal 2011 | 5 years |  |
Annual dividend yield |  | 1.60% |
Minimum [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of years of service when options with a reload provision were no longer issued to officers beginning in Fiscal 2006 | 5 years |  |
Annual dividend yield |  | 1.40% |
Two Thousand Ten Master Stock Incentive Plan [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Performance award expense | $ 100 | $ 700 | $ 100
Two Thousand Ten Master Stock Incentive Plan [Member] | Maximum [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Options exercisable from date of the grant, in years | 10 years |  |
Reload Grants [Member] | Maximum [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Options exercisable from date of the grant, in years | 4 years | 6 years | 5 years
Non Officer Original Grants [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Options exercisable from date of the grant, in years | 7 years | 7 years | 7 years
Director Original Grants Without Reloads [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Options exercisable from date of the grant, in years | 8 years | 8 years | 8 years
After Fiscal Two Thousand Ten [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting period, years | 3 years |  |
After Fiscal Two Thousand Three [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting period, years | 3 years |  |

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + Details
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- Definition Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash. + 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 (d)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term. + 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)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + 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 (d)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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