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Marketable Securities (Details) - USD ($)
$ in Thousands
Oct. 31, 2015
Jul. 31, 2015
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost $ 47,369 $ 40,862
Gross Unrealized Gains 39 12
Gross Unrealized Losses (86) (587)
Fair Value 47,322 40,287
Certificates of Deposit [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost [1] 24,400 22,736
Gross Unrealized Gains [1] $ 6 3
Gross Unrealized Losses [1] (2)
Fair Value [1] $ 24,406 22,737
Federal Home Loan Bank bonds [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost $ 795 $ 795
Gross Unrealized Gains
Gross Unrealized Losses
Fair Value $ 795 $ 795
Federal Home Loan Mortgage Corp. bonds [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 2,203  
Gross Unrealized Gains 3  
Gross Unrealized Losses (2)  
Fair Value 2,204  
Mutual funds [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost $ 5,025 $ 5,000
Gross Unrealized Gains
Gross Unrealized Losses $ (82) $ (18)
Fair Value 4,943 4,982
Corporate bonds [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 3,090  
Gross Unrealized Gains 6  
Gross Unrealized Losses (2)  
Fair Value 3,094  
U.S. Treasury notes [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 2,644  
Gross Unrealized Gains $ 11  
Gross Unrealized Losses  
Fair Value $ 2,655  
Municipal Bonds [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 9,212 9,125
Gross Unrealized Gains $ 13 9
Gross Unrealized Losses (3)
Fair Value $ 9,225 9,131
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
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
[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.