Condensed Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Jan. 31, 2013	Jul. 31, 2012
Allowance for doubtful accounts	$ 435	$ 527
Preferred stock, shares authorized	1,000,000	1,000,000
Preferred stock, shares outstanding
Common stock, par value	$ 0.10	$ 0.10
Common stock, shares authorized	250,000,000	250,000,000
Common stock, shares issued	61,899,331	61,777,849
Treasury, shares	8,857,339	8,857,339