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Stock Compensation Plan (Schedule Of Share Based Compensation Option And SARs Award Activity) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Jul. 31, 2017	Jul. 31, 2016	Jul. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Awards, outstanding beginning balance (in shares)	2,381	2,385	2,756
Awards, granted (in shares)	143	198	242
Awards, exercised (in shares)	(215)	(180)	(575)
Awards, forfeited or expired (in shares)	(19)	(22)	(38)
Awards, outstanding ending balance (in shares)	2,290	2,381	2,385
Awards, exercisable ending balance (in shares)	1,972
Weighted-average exercise price, outstanding beginning balance (in dollars per share)	$ 52.98	$ 47.96	$ 42.06
Weighted-average exercise price, granted (in dollars per share)	174.42	113.67	91.64
Weighted-average exercise price, exercised (in dollars per share)	60.05	49.79	36.20
Weighted-average exercise price, forfeited or expired (in dollars per share)	108.06	80.42	75.99
Weighted-average exercise price, outstanding ending balance (in dollars per share)	59.12	$ 52.98	$ 47.96
Weighted-average exercise price, exercisable ending balance (in dollars per share)	$ 46.84
Weighted-average remaining contractual term, outstanding ending balance (in years)	4 years 5 months
Weighted-average remaining contractual term, exercisable ending balance (in years)	3 years 8 months
Aggregate intrinsic value, outstanding ending balance	$ 347,214
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Number	2,267
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Exercise Price	$ 58.38
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Remaining Contractual Term	4 years 4 months
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value	$ 345,458
Aggregate intrinsic value, exercisable ending balance	$ 323,243

X

- Definition

The total dollar difference between fair values of the underlying shares reserved for issuance and exercise prices of vested portions of options and stock appreciation rights outstanding and currently exercisable under the option plan as of the balance sheet date.

+ References

No definition available.

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- Definition

The number of shares into which fully or partially vested stock options and stock appreciation rights outstanding as of the balance sheet date can be currently converted under the plan.

+ References

No definition available.

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- Definition

The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options and stock appreciation rights outstanding and currently exercisable under the plan.

+ References

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- Definition

The weighted average period between the balance sheet date and expiration for all vested portions of options and stock appreciation rights outstanding and currently exercisable (or convertible) under the plan, which may be expressed in a decimal value for number of years.

+ References

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- Definition

The weighted average price at which option and stock appreciation right holders acquired shares when converting their stock options or stock appreciation rights into shares under the plan during the reporting period.

+ References

No definition available.

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- Definition

For presentations that combine terminations, the number of shares under options and stock appreciation rights that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the plan or that expired.

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- Definition

The combined weighted average exercise price associated with stock options and stock appreciation rights during the period that have either lapsed or been forfeited.

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- Definition

The weighted average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on stock options and stock appreciation rights awarded under the plan during the reporting period.

+ References

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- Definition

The total dollar difference between fair values of the underlying shares reserved for issuance and exercise prices pertaining to options and stock appreciation rights outstanding under the plan as of the balance sheet date.

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- Definition

The number of shares reserved for issuance under stock option agreements and stock appreciation rights awarded under the plan that validly exist and are outstanding as of the balance sheet date, including vested options and stock appreciation rights.

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- Definition

The weighted average price as of the beginning of the year at which grantees can acquire the shares reserved for issuance under the plan for options and stock appreciation rights.

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- Definition

The weighted average period between the balance sheet date and expiration for all awards of options and stock appreciation rights outstanding under the plan, which may be expressed in a decimal value for number of years.

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The number of grants made during the period on stock appreciation rights.

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Number of share options and stock appreciation rights exercised during the current period.

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- Definition

The number of exercisable share options (fully vested and expected to vest) that may be converted as of the balance sheet date.

+ 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)(2)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

Amount by which the current fair value of the underlying stock exceeds the exercise price of fully vested and expected to vest options outstanding.

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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)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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As of the balance sheet date, the weighted-average exercise price for outstanding stock options that are fully vested or expected to vest.

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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

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- Definition

Weighted average remaining contractual term for fully vested and expected to vest options 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

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