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Marketable Securities (Details) - USD ($)
$ in Thousands
Jul. 31, 2015
Jul. 31, 2014
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost $ 40,862 $ 12,881
Gross Unrealized Gains 12 1
Gross Unrealized Losses (587) (9)
Fair Value 40,287 12,873
Certificates of Deposit [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost [1] 22,736 $ 10,375
Gross Unrealized Gains [1] 3
Gross Unrealized Losses [1] (2)
Fair Value [1] 22,737 $ 10,375
Equity Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost   $ 31
Gross Unrealized Gains  
Gross Unrealized Losses   $ (9)
Fair Value   22
Federal Home Loan Bank bonds [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost $ 795  
Gross Unrealized Gains  
Gross Unrealized Losses  
Fair Value $ 795  
International agency notes [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost $ 1,120  
Gross Unrealized Gains  
Gross Unrealized Losses $ (1)  
Fair Value 1,119  
Mutual funds [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost $ 5,000  
Gross Unrealized Gains  
Gross Unrealized Losses $ (18)  
Fair Value 4,982  
Straight Path Communications Inc. common stock [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost $ 2,086  
Gross Unrealized Gains  
Gross Unrealized Losses $ (563)  
Fair Value 1,523  
Municipal Bonds [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 9,125 2,475
Gross Unrealized Gains 9 $ 1
Gross Unrealized Losses (3)
Fair Value $ 9,131 $ 2,476
[1] Each of the Company's certificates of deposit has a CUSIP, was purchased in the secondary market through a broker and may be sold in the secondary market.