Marketable Securities (Details Textual) - USD ($)	2 Months Ended	3 Months Ended		12 Months Ended
	Oct. 31, 2015	Oct. 31, 2015	Oct. 31, 2014	Jul. 31, 2015
Marketable Securities (Textual)
Company received number of Straight Path Class B common stock, Value		$ 8,861,000	$ 6,818,000
Realized gains (losses) from sales of available-for-sale securities		500,000	(40,000)
Proceeds from maturities of available-for-sale securities		8,900,000	$ 6,800,000
Realized gains (losses) from sales excluding temporary impairment		$ 0
Straight Path Class B shares [Member]
Marketable Securities (Textual)
Company received number of Straight Path Class B common stock, shares				64,624
Company received number of Straight Path Class B common stock, Value	$ 2,600,000
Realized gains (losses) from sales of available-for-sale securities	$ 500,000
Payment of an aggregate for employee tax withholding on Straight Path shares				$ 2,100,000