Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Per Share data, unless otherwise specified	Oct. 31, 2013	Jul. 31, 2013
Allowance for doubtful accounts	$ 13,540	$ 13,079
Preferred stock, par value	$ 0.1	$ 0.1
Preferred stock, Authorized shares	10,000	10,000
Preferred stock, shares issued
Class A Common Stock [Member]
Common stock, Par value	$ 0.01	$ 0.01
Common stock, shares authorized	35,000	35,000
Common stock, shares issued	3,272	3,272
Common stock, shares outstanding	1,574	1,574
Treasury stock, Common stock shares	1,698	1,698
Class B Common Stock [Member]
Common stock, Par value	$ 0.01	$ 0.01
Common stock, shares authorized	200,000	200,000
Common stock, shares issued	24,309	24,275
Common stock, shares outstanding	21,425	21,397
Treasury stock, Common stock shares	2,884	2,878