Stock-Based Compensation - Summary of Stock Option Activity under Company's Share-Based Compensation Plans (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	6 Months Ended
Jan. 31, 2013	Jan. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares outstanding, beginning balance	6,253,751
Shares outstanding, exercised	(330,338)
Shares outstanding, forfeited or expired	(497,273)
Shares outstanding, ending balance	6,216,590
Options outstanding, exercisable	4,049,293	4,024,955
Options outstanding, beginning balance, weighted average exercise price (USD per share)	$ 29.24
Options outstanding, exercised, weighted average exercise price (USD per share)	$ 18.57
Options outstanding, forfeited or expired, weighted average exercise price (USD per share)	$ 30.53
Options outstanding, ending balance, weighted average exercise price (USD per share)	$ 29.84
Weighted average exercise price of options exercisable	$ 30.19	$ 29.31
Options outstanding, ending balance, weighted average remaining contractual term	6 years 3 months 18 days
Options outstanding, exercisable, weighted average remaining contractual term	5 years 1 month 6 days
Options outstanding, ending balance, aggregate intrinsic value	$ 35,476
Options outstanding, exercisable, aggregate intrinsic value	$ 22,891
Service Based Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares outstanding, new grants	790,450
Options outstanding, new grants, weighted average exercise price (USD per share)	$ 30.36

The weighted average price of stock options exercised during the reporting period.

No definition available.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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

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

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

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