Aggregate Cash and Cash Equivalents (Detail) - USD ($) $ in Thousands	Oct. 31, 2015	Jul. 31, 2015
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 10,807	$ 10,943
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Market Value	10,807	10,943
Cash and cash equivalents
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	10,807	10,943
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Market Value	$ 10,807	$ 10,943