Aggregate Cash and Cash Equivalents (Detail) - USD ($) $ in Thousands	Jul. 31, 2015	Jul. 31, 2014
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 10,943	$ 12,241
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Market Value	10,943	12,241
Cash and cash equivalents
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	10,943	12,241
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Market Value	$ 10,943	$ 12,241