Discontinued Operations - Condensed Results Of Operations Related For Divestiture (Detail) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Apr. 30, 2014	Apr. 30, 2013
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Revenues	$ 13,674	$ 15,019
Operating expenses	2,934	2,875
Interest income (expense)	(454)	168
Income (loss) from divested operations	$ (617)	$ 721