Assets and Liabilities Fair Value Measurements on Recurring Basis (Detail) (USD $) In Thousands, unless otherwise specified	Jan. 25, 2014	Jul. 31, 2013
Fair Value, Measurements, Recurring
Assets
Cash and Cash Equivalents	$ 17,475	$ 21,041
Total assets	17,475	21,041
Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets
Cash and Cash Equivalents	17,475	21,041
Total assets	$ 17,475	$ 21,041