Stock Option Plan and Employee Stock Purchase Plan (Details) (USD $)	3 Months Ended
Oct. 31, 2012	Oct. 31, 2011
Aggregate maximum number of shares of common stock which may be issued under stock option plan	8,962,500
Maximum term for grants of incentive and non-qualified stock-based awards, excluding incentive stock-based awards granted to stockholders who own more than 10% of the voting power	10 years
Maximum term for incentive stock-based awards granted to stockholders who own more than 10% of the voting power	5 years
Percentage of a stockholder's voting power that limits the contractual term of an incentive stock-based award	10.00%
Aggregate number of stock-based awards granted, net of expired and canceled awards	6,695,841
Aggregate number of expired and canceled stock based awards under stock option plan	2,207,940
Share-based compensation, shares authorized under stock option plans, exercise price range, lower range limit	$ 3.13
Share-based compensation, shares authorized under stock option plans, exercise price range, upper range limit	$ 51.65
Number of stock-based awards, including stock appreciation rights, exercised as of balance sheet date	3,747,410
Number of stock appreciation rights exercised as of balance sheet date	750
Share-based Compensation Arrangement by Share-based Payment Award, Options or Units, Outstanding, Number, Beginning Balance	3,506,484
Share-based Compensation Arrangement by Share-based Payment Award, Options or Units, Grants in Period, Gross	222
Share-based Compensation Arrangement by Share-based Payment Award, Options or Units, Forfeitures and Expirations in Period	(542,075)
Share-based Compensation Arrangement by Share-based Payment Award, Options or Units, Exercises in Period	(16,200)
Share-based Compensation Arrangement by Share-based Payment Award, Options or Units, Outstanding, Number, Ending Balance	2,948,431
Share-based Compensation Arrangement by Share-based Payment Award, Options or Units, Exercisable, Number	1,704,942
Share-based Compensation Arrangement by Share-based Payment Award, Options or Units, Vested and Expected to Vest, Outstanding, Number	2,881,798
Share-based Compensation Arrangement by Share-based Payment Award, Options or Units, Outstanding, Weighted Average Exercise Price, Beginning of Period	$ 31.17
Share-based Compensation Arrangement by Share-based Payment Award, Options or Units, Grants in Period, Weighted Average Exercise Price	$ 0.00
Share-based Compensation Arrangements by Share-based Payment Award, Options or Units, Exercises in Period, Weighted Average Exercise Price	$ 19.95
Share-based Compensation Arrangement by Share-based Payment Award, Options or Units, Forfeitures and Expirations in Period, Weighted Average Exercise Price	$ 40.95
Share-based Compensation Arrangement by Share-based Payment Award, Options or Units, Outstanding, Weighted Average Exercise Price, End of Period	$ 29.44
Share-based Compensation Arrangement by Share-based Payment Award, Options or Units, Exercisable, Weighted Average Exercise Price	$ 30.90
Share-based Compensation Arrangement by Share-based Payment Award, Options or Units, Vested and Expected to Vest, Outstanding, Weighted Average Exercise Price	$ 29.47
Share-based Compensation Arrangement by Share-based Payment Award, Options or Units, Outstanding, Weighted Average Remaining Contractual Term	4 years 11 months 1 day
Share-based Compensation Arrangement by Share-based Payment Award, Options or Units, Exercisable, Weighted Average Remaining Contractual Term	2 years 6 months 29 days
Share-based Compensation Arrangement by Share-based Payment Award, Options or Units, Vested and Expected to Vest, Outstanding, Weighted Average Remaining Contractual Term	4 years 10 months 2 days
Share-based Compensation Arrangement by Share-based Payment Award, Options or Units, Outstanding, Intrinsic Value	$ 3,852,000
Share-based Compensation Arrangement by Share-based Payment Award, Options or Units, Exercisable, Intrinsic Value	2,652,000
Share-based Compensation Arrangement by Share-based Payment Award, Options or Units, Vested and Expected to Vest, Outstanding, Intrinsic Value	3,808,000
Stock-based awards other than options, outstanding, combined aggregate intrinsic value	1,216,000
Total intrinsic value of stock-based awards exercised	$ 350,000	$ 864,000
Total number of common shares reserved for issuance under employee stock purchase plan	675,000
Discount rate from market value, on purchase date, offered to employees participating in the Employee Stock Purchase Plan (ESPP)	85.00%
Total number of shares of common stock issued to employees under employee stock purchase plan and through the end of the reporting period	484,567
Liability-Classified Stock Appreciation Rights (SARs) [Member]
Shares reserved for issuance, outstanding and vested	17,000
Stock Units [Member]
Shares reserved for issuance, outstanding and vested	632
Restricted Stock Units (RSUs) Without Performance Measures [Member]
Shares reserved for issuance, outstanding and unvested	12,668
Restricted Stock Units (RSUs) With Performance Measures [Member]
Shares reserved for issuance, outstanding and unvested	35,003

The aggregate number of expired and canceled stock-based awards under stock option plan.

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Discount rate from market value, on purchase date, offered to employees participating in the Employee Stock Purchase Plan (ESPP)

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The maximum term for grants of incentive and non-qualified stock-based awards, excluding grants of incentive stock-based awards to stockholders who own more than 10% of the voting power.

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The maximum term for grants of incentive stock-based awards granted to a stockholder who owns more than 10% of the voting power.

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The number of stock appreciation rights exercised or converted into shares, other instruments, or cash in accordance with the terms of the arrangement as of the balance sheet date.

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Percentage of a stockholder's voting power that limits the contractual term of an incentive stock-based award.

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Combined aggregate amount of difference between fair value of the underlying shares reserved for issuance and exercise price of stock-based awards other than stock options outstanding as of the balance sheet date

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Number of shares reserved for issuance outstanding and unvested for stock-based awards other than options as of the balance sheet date

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Number of shares of common stock that were reserved for issuance under the Employee Stock Purchase Plan.

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Total number of shares of common stock issued to employees under employee stock purchase plan and through the end of the reporting period

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The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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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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The total accumulated difference between fair values of underlying shares on dates of exercise and exercise price on options which were exercised (or share units converted) into shares during the reporting period under the plan.

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

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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 prices of fully vested and expected to vest options outstanding.

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As of the balance sheet date, the number of shares into which fully vested and expected to vest stock options outstanding can be converted under the option plan.

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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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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.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average price at which grantees can acquire the shares reserved for issuance on stock options awarded.

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The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

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The weighted average price as of the balance sheet date at which grantees could acquire the underlying shares with respect to all outstanding stock options which are in the customized range of exercise prices.

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

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