The amount by which the fair value of an investment is less than the amortized cost basis or carrying amount of that investment at the balance sheet date and the decline in fair value is deemed to be other than temporary, before considering whether or not such amount is recognized in earnings or other comprehensive income.

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Reference 2: http://www.xbrl.org/2003/role/presentationRef

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+ Details

- Definition

Amount of revenue, fees and commissions earned from transactions between (a) a parent company and its subsidiaries; (b) subsidiaries of a common parent; (c) an entity and trusts for the benefit of employees, for example, but not limited to, pension and profit-sharing trusts that are managed by or under the trusteeship of the entity's management; (d) an entity and its principal, owners, management, or members of their immediate families; and (e) affiliates.

+ References+ Details

Related Party Transactions - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	1 Months Ended	3 Months Ended	9 Months Ended	12 Months Ended
	Jul. 25, 2011	Apr. 30, 2012	Apr. 30, 2012	Jul. 31, 2006
Transactions with Third Party [Line Items]
Gain on sale of other investments			$ 2,500
China-based affiliate
Transactions with Third Party [Line Items]
Percentage of interest in affiliate sold	25.00%
Value of interest in affiliate	2,500
Book value of interest in affiliate written down				0
Gain on sale of other investments			2,500
Sales to affiliate		$ 0	$ 1,570