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Stock-based Compensation (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Oct. 31, 2013
Number of Options [Roll Forward]
Outstanding at July 31, 2013	14,922
Grants of options
Exercises	(20)
Forfeitures or expirations
Outstanding at October 31, 2013	14,902
Exercisable at October 31, 2013	12,169
Weighted- average Exercise Price [Roll Forward]
Outstanding at July 31, 2013	$ 16.75
Grants of options
Exercises	$ 15.37
Forfeitures or expirations
Outstanding at October 31, 2013	$ 16.76
Exercisable at October 31, 2013	$ 16.08
Weighted-Average Remaining Contractual Term [Roll Forward]
Outstanding at July 31, 2013	5 years 10 months 28 days
Outstanding at October 31, 2013	5 years 7 months 21 days
Exercisable at October 31, 2013	5 years 4 months 10 days
Aggregate Intrinsic Value [Roll Forward]
Outstanding at July 31, 2013	$ 235,086
Outstanding at October 31, 2013	230,571
Exercisable at October 31, 2013	$ 196,496

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

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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.

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Number of share options (or share units) exercised during the current period.

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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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.

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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 outstanding and currently exercisable under the stock option plan.

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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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

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Gross number of share options (or share units) granted during the period.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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