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Reportable Segment Information (Parenthetical) (Detail) (USD $) In Thousands, unless otherwise specified	Apr. 30, 2015	Jul. 31, 2014	Apr. 30, 2014	Jul. 31, 2013
Segment Reporting Information [Line Items]
Cash and cash equivalents	$ 119,835	$ 114,540	$ 119,448	$ 113,033
Corporate
Segment Reporting Information [Line Items]
Cash and cash equivalents	$ 82,800	$ 60,900

Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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