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Summary of Significant Accounting Policies - Breakdown Of The Investments With Unrealized Losses (Detail) (USD $) In Thousands, unless otherwise specified	Jul. 31, 2012	Jul. 31, 2011
Schedule Of Available-For-Sale Securities [Line Items]
Government securities	$ 96,449	$ 283,591
Government securities
Government securities
Government securities	(22)	(157)
Government securities	96,449	283,591
More Than 12 Months [Member]
Schedule Of Available-For-Sale Securities [Line Items]
Government securities
Government securities
Less Than 12 Months [Member]
Schedule Of Available-For-Sale Securities [Line Items]
Government securities	(22)	(157)
Government Securities [Member]
Schedule Of Available-For-Sale Securities [Line Items]
Government securities	96,449	283,591
Government securities
Government securities
Government securities	(22)	(157)
Government securities	96,449	283,591
Government Securities [Member] \| More Than 12 Months [Member]
Schedule Of Available-For-Sale Securities [Line Items]
Government securities
Government securities
Government Securities [Member] \| Less Than 12 Months [Member]
Schedule Of Available-For-Sale Securities [Line Items]
Government securities	$ (22)	$ (157)

This item represents the aggregate fair value of investments in debt and equity securities in an unrealized loss position which are categorized neither as held-to-maturity nor trading securities.

+ References+ Details

- Definition

This item represents the aggregate fair value of investments in debt and equity securities categorized neither as held-to-maturity nor trading securities that have been in a continuous unrealized loss position for less than twelve months.

+ References+ Details

- Definition

This item represents the aggregate fair value of investments in debt and equity securities categorized neither as held-to-maturity nor trading securities that have been in a continuous unrealized loss position for twelve months or longer.

+ References+ Details