Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Per Share data, unless otherwise specified	Jan. 28, 2012	Jul. 31, 2011
Accounts receivable, allowance for doubtful accounts	$ 72	$ 72
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares authorized	5,000	5,000
Preferred stock, issued
Preferred stock, outstanding
Common stock, par value	$ 0.001	$ 0.001
Common stock, shares authorized	250,000	250,000
Common stock, shares issued	28,774	28,739
Common stock, shares outstanding	28,774	28,739