Equity - Additional Information (Detail) (USD $)	1 Months Ended				12 Months Ended					3 Months Ended	12 Months Ended			0 Months Ended	3 Months Ended	12 Months Ended			0 Months Ended
	Aug. 31, 2013	Dec. 31, 2012	Nov. 21, 2012	Nov. 15, 2011	Jul. 31, 2014	Jul. 31, 2013	Jul. 31, 2012	Jul. 31, 2014 Straight Path [Member]	Jul. 31, 2014 Additional Paid In Capital [Member]	Jul. 31, 2014 Class B Common Stock [Member]	Jul. 31, 2014 Class B Common Stock [Member]	Jul. 31, 2013 Class B Common Stock [Member]	Jul. 31, 2012 Class B Common Stock [Member]	Oct. 05, 2014 Class B Common Stock [Member] Subsequent Event [Member]	Jul. 31, 2014 Class A Common Stock [Member]	Jul. 31, 2014 Class A Common Stock [Member]	Jul. 31, 2013 Class A Common Stock [Member]	Jul. 31, 2012 Class A Common Stock [Member]	Oct. 05, 2014 Class A Common Stock [Member] Subsequent Event [Member]
Schedule Of Stockholders Equity [Line Items]
Voting rights description					The holders of Class A common stock are entitled to three votes per share and the holders of Class B common stock are entitled to one-tenth of a vote per share.
Dividend paid per share											$ 0.59	$ 0.75	$ 0.66	$ 0.17		$ 0.59	$ 0.75	$ 0.66	$ 0.17
Date of declared dividend will be paid										Oct. 27, 2014					Oct. 27, 2014
Aggregate dividends paid					$ 13,600,000	$ 17,100,000	$ 15,000,000
Dividends declared, per share												$ 0.08					$ 0.08
Stock repurchase program, shares authorized for repurchase										8,300,000	8,300,000
Stock repurchased in a fiscal year												77,843	300,000
Aggregate purchase price of shares repurchased												800,000	2,600,000
Stock repurchase program, remaining number of shares authorized to be repurchased										5,100,000	5,100,000
Cash paid to purchase ownership percentage in subsidiary	1,100,000	1,800,000			1,133,000	1,804,000
Ownership percentage increased in subsidiary	2.80%	4.50%
Ownership percentage in subsidiary	88.40%
Cash received on sale of Zedge stock to Shaman II L.P			100,000	100,000
Percentage of ownership before additional acquisition			11.10%	11.00%
Percentage of ownership after additional acquisition			11.17%	11.10%
Additional liability								1,700,000	1,600,000
Dividends payable						$ 1,837,000