CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Apr. 30, 2013	Jul. 31, 2012
CONDENSED CONSOLIDATED BALANCE SHEETS
Accounts receivable, allowance for doubtful accounts (in dollars)	$ 691	$ 1,041
Preferred Stock, par value (in dollars per share)	$ 1.00	$ 1.00
Preferred Stock, authorized shares	1,000,000	1,000,000
Preferred Stock, shares issued	0	0
Common Stock, par value (in dollars per share)	$ 0.10	$ 0.10
Common Stock, authorized shares	75,000,000	75,000,000
Common Stock, shares issued	30,014,849	29,997,898
Common Stock, shares outstanding	27,346,692	27,100,729
Treasury Stock, shares	2,668,157	2,897,169