Components of Identifiable Intangible Assets and their Estimated Useful Lives (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Jul. 31, 2012
Acquired Finite-Lived Intangible Assets [Line Items]
Total acquired identifiable intangible assets	$ 730
Order or Production Backlog
Acquired Finite-Lived Intangible Assets [Line Items]
Total acquired identifiable intangible assets	70
Weighted average useful life	3 months 15 days
Developed Technology Rights
Acquired Finite-Lived Intangible Assets [Line Items]
Total acquired identifiable intangible assets	420
Weighted average useful life	5 years
Customer Relationships
Acquired Finite-Lived Intangible Assets [Line Items]
Total acquired identifiable intangible assets	$ 240
Weighted average useful life	5 years