Equity (Details) (USD $)	3 Months Ended	1 Months Ended	3 Months Ended			1 Months Ended		3 Months Ended	1 Months Ended	3 Months Ended
	Oct. 31, 2014	Aug. 31, 2014 Class B common stock [Member]	Oct. 31, 2014 Class B common stock [Member]	Oct. 31, 2013 Class B common stock [Member]	Sep. 30, 2014 Class B common stock [Member]	Aug. 31, 2014 Class B common stock [Member] Davidi Jonas [Member]	Aug. 31, 2014 Class B common stock [Member] Jonathan Rand [Member]	Oct. 31, 2014 Class B common stock [Member] Consultants [Member]	Sep. 30, 2014 Class B common stock [Member] Zhouyue (Jerry) Pi [Member]	Oct. 31, 2014 Class B common stock [Member] IDT [Member]
Equity (Textual)
Stock issued during period, Shares								183,000
Common stock issued for exercises of stock options, shares								1,244,000		2,924,000
Common stock issued for exercises of stock options	$ (7,000)							$ 7,053,000		$ 16,600,000
Number of shares cancelled, previously issued to former employess										1,000
Number of shares held in treasury stock, shares					35,846
Number of shares held in treasury stock, value	348,000				348,000
Additional shares issued for amendment of stock option and incentive plan			350,000
Stock-based compensation expense			383,262	156,294
Number of restricted shares issued, shares						71,000	52,000		60,000
Number of restricted shares issued, value		$ 1,214,000							$ 573,000
Description of restricted shares vesting condition		Both grants of restricted shares will vest as to approximately one-third of the granted shares on each of February 1, 2015, 2016 and 2017.							These restricted shares will vest as to one-third of the granted shares on each of September 1, 2015, 2016 and 2017.