Equity (Details Textual) (USD $)	1 Months Ended				3 Months Ended		6 Months Ended
	Dec. 31, 2012	Nov. 30, 2012	Oct. 31, 2012	Sep. 30, 2012	Jan. 31, 2013	Jan. 31, 2012	Jan. 31, 2013	Jan. 31, 2012	Nov. 21, 2012
Equity (Textual)
Dividends declared, per share						$ 0.13	$ 0.75	$ 0.36
Dividend paid per share		$ 0.60	$ 0.15
Aggregate dividends paid		$ 17,100,000	$ 3,400,000				$ 17,124,000
Percentage of equity interest sold by subsidiary				10.00%
Stock based compensation on granted equity of subsidiary							1,200,000
Cash received on sale of Zedge stock to Shaman II L.P		100,000
Percentage of ownership before additional acquisition									11.10%
Percentage of ownership after additional acquisition									11.17%
Cash paid to purchase ownership percentage in subsidiary	1,800,000						(1,804,000)
Ownership percentage increased in subsidiary	4.50%
Ownership percentage in subsidiary	86.10%
Equity method investment old ownership percentage in subsidiary	81.60%
Class B Common Stock [Member]
Equity, Class of Treasury Stock [Line Items]
Aggregate purchase price of shares repurchased of Class B common stock							$ 800,000
Stock repurchase program, shares authorized for repurchase of Class B common stock					8,300,000		8,300,000
Stock repurchased of Class B in a fiscal year							77,843	0
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased					5,100,000		5,100,000