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Reportable Segment Information (Parenthetical) (Detail) (USD $)
In Thousands, unless otherwise specified
Apr. 30, 2014
Jul. 31, 2013
Apr. 30, 2013
Jul. 31, 2012
Segment Reporting Information [Line Items]        
Cash and cash equivalents $ 119,448 $ 113,033 $ 91,347 $ 187,011
Corporate assets
       
Segment Reporting Information [Line Items]        
Cash and cash equivalents $ 73,500 $ 57,400