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Stock Compensation Plan (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Jul. 31, 2016 | Jul. 31, 2015 | Jul. 31, 2014 | Jul. 31, 2019 | Jul. 31, 2018 | Jul. 31, 2017
Shares issued for stock based compensation (in shares) | 4,400,000 |  |  |  |  |
Stock based compensation award life | 10 years |  |  |  |  |
Stock based compensation award vesting period | 3 years |  |  |  |  |
Stock based compensation, shares available for grant (in shares) | 4,400,000 |  |  |  |  |
Total unrecognized compensation expense | $ 19.7 |  |  |  |  |
Cash received from exercise of stock option | 0.0 | $ 1.1 | $ 1.8 |  |  |
Tax benefit from exercise of stock options | $ 10.3 | $ 18.1 | $ 8.5 |  |  |
Stock Appreciation Rights (SARs) [Member] |  |  |  |  |  |
Weighted-average grant-date fair value (in dollars per share) | $ 35.20 | $ 29.12 | $ 23.60 |  |  |
Intrinsic value of options and SARs exercised | $ 13.1 | $ 37.4 | $ 10.8 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested, Number of Shares | 302,000 | 420,000 | 421,000 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value | $ 10.8 | $ 13.6 | $ 9.8 |  |  |
Restricted Stock Units (RSUs) [Member] |  |  |  |  |  |
Weighted-average grant-date fair value (in dollars per share) | $ 102.20 | $ 83.50 | $ 67.48 |  |  |
Stock based compensation, restricted shares granted (in shares) | 142,000 | 143,000 | 152,000 |  |  |
Stock based compensation, restricted shares vested (in shares) | 134,000 | 113,000 | 166,000 |  |  |
Stock based compensation, total fair value of restricted shares | $ 14.6 | $ 9.9 | $ 6.9 |  |  |
Expected to be Recognized in 2011 [Member] | Scenario, Forecast [Member] |  |  |  |  |  |
Total unrecognized compensation expense |  |  |  | $ 0.9 | $ 6.8 | $ 12.0
Maximum [Member] |  |  |  |  |  |
Stock based compensation, estimated forfeiture rates | 21.60% |  |  |  |  |
Minimum [Member] |  |  |  |  |  |
Stock based compensation, estimated forfeiture rates | 0.00% |  |  |  |  |

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- Definition Aggregate proceeds received by the entity during the annual period from exercises of stock or unit options and conversion of similar instruments granted under equity-based payment arrangements. + 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 (j) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Unrecognized cost of unvested share-based compensation awards. + 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 (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Disclosure of the aggregate tax benefit realized from the exercise of stock options and the conversion of similar instruments during the annual period. + 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 (j) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + 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 + Details
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- Definition Net number of share options (or share units) granted during the period. + 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)(iv)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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