Stock Compensation Plan (Schedule Of Share Based Compensation Option And SARs Award Activity) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
Jul. 31, 2011	Jul. 31, 2010	Jul. 31, 2009
Stock Compensation Plan
Awards, outstanding beginning balance	2,377	2,183	1,219
Awards, granted	371	377	1,055
Awards, exercised	(67)	(46)	(31)
Awards, forfeited or expired	(20)	(137)	(60)
Awards, outstanding ending balance	2,661	2,377	2,183
Awards, exercisable ending balance	1,361
Weighted-average exercise price, outstanding beginning balance	$ 30.80	$ 30.49	$ 32.83
Weighted-average exercise price, granted	$ 37.40	$ 35.86	$ 27.88
Weighted-average exercise price, exercised	$ 20.06	$ 23.60	$ 17.54
Weighted-average exercise price, forfeited or expired	$ 28.59	$ 42.30	$ 38.97
Weighted-average exercise price, outstanding ending balance	$ 32.02	$ 30.80	$ 30.49
Weighted-average exercise price, exercisable ending balance	$ 34.12
Weighted-average remaining contractual term, outstanding ending balance (in years)	6.6
Weighted-average remaining contractual term, exercisable ending balance (in years)	5.2
Aggregate intrinsic value, outstanding ending balance	$ 38,891
Aggregate intrinsic value, exercisable ending balance	$ 18,172

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.

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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.

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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.

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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.

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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.

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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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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.

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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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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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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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