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Segments - Additioanl Information (Detail) (USD $)	3 Months Ended		6 Months Ended		12 Months Ended
Segments - Additioanl Information (Detail) (USD $)	Jan. 31, 2014	Jan. 31, 2013	Jan. 31, 2014	Jan. 31, 2013	Jul. 31, 2013	Jul. 31, 2012
Income from discontinued operations	$ 18,000	$ 45,000	$ 76,000	$ 127,000	$ 56,000	$ 455,000
Ongoing Operating Costs and Expenses [Member]
Income from discontinued operations				$ 431,000		$ 920,000

Amount of income (loss) from a disposal group, net of income tax before extraordinary items allocable to noncontrolling interests. Includes, net of tax, income (loss) from operations during the phase-out period, gain (loss) on disposal, provision (or any reversals of earlier provisions) for loss on disposal, and adjustments of a prior period gain (loss) on disposal.

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