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Stock-based Payment Compensation (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Oct. 31, 2014
Number of Options [Roll Forward]
Outstanding as of July 31, 2014	19,082
Grants of options	85
Exercises	(309)
Forfeitures or expirations
Outstanding as of October 31, 2014	18,858
Exercisable as of October 31, 2014	13,032
Weighted - Average Exercise Price [Roll Forward]
Outstanding as of July 31, 2014	$ 21.64
Grants of options	$ 31.49
Exercise Price	$ 19.04
Forfeitures or expirations
Outstanding as of October 31, 2014	$ 21.73
Exercisable as of October 31, 2014	$ 16.33
Weighted - Average Remaining Contractual Term [Roll Forward]
Outstanding as of July 31, 2014	6 years 4 days
Outstanding as of October 31, 2014	5 years 10 months 17 days
Exercisable as of October 31, 2014	4 years 6 months 18 days
Aggregate Intrinsic Value [Roll Forward]
Outstanding as of July 31, 2014	$ 235,734
Outstanding as of October 31, 2014	232,305
Exercisable as of October 31, 2014	$ 223,012

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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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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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Weighted average price of options that were either forfeited or 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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