Schedule of Aggregate Intrinsic Value of Options (Detail) - USD ($) $ in Thousands	Jul. 31, 2014	Jul. 31, 2013
Stockholders' Equity
Aggregate intrinsic value of options outstanding and expected to vest	$ 124	$ 2,399
Aggregate intrinsic value of options exercisable	$ 124	$ 2,399

Amount by which the current fair value of the underlying stock exceeds the exercise price of fully vested and expected to vest options outstanding.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (e)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant