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Stock-based Compensation (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	6 Months Ended
	Jan. 31, 2014
Number of Options [Roll Forward]
Outstanding at July 31, 2013	14,922
Grants of options	4,863
Exercises	(291)
Forfeitures or expirations	(77)
Outstanding at January 31, 2014	19,417
Exercisable at January 31, 2014	12,592
Weighted- Average Exercise Price [Roll Forward]
Outstanding at July 31, 2013	$ 16.75
Grants of options	$ 35.73
Exercises	$ 16.42
Forfeitures or expirations	$ 15.42
Outstanding at January 31, 2014	$ 21.52
Exercisable at January 31, 2014	$ 16.23
Weighted-Average Remaining Contractual Term [Roll Forward]
Outstanding at July 31, 2013	5 years 10 months 28 days
Outstanding at January 31, 2014	6 years 6 months 22 days
Exercisable at January 31, 2014	5 years 2 months 23 days
Aggregate Intrinsic Value [Roll Forward]
Outstanding at July 31, 2013	$ 235,086
Outstanding at January 31, 2014	254,817
Exercisable at January 31, 2014	$ 227,287

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

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