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Marketable Securities (Details) - USD ($)
$ in Thousands
Jan. 31, 2016
Jul. 31, 2015
Schedule of Available-For-Sale Securities [Line Items]    
Amortized Cost $ 46,987 $ 40,862
Gross Unrealized Gains 60 12
Gross Unrealized Losses (250) (587)
Fair Value 46,797 40,287
Certificates of Deposit [Member]    
Schedule of Available-For-Sale Securities [Line Items]    
Amortized Cost [1] $ 21,831 22,736
Gross Unrealized Gains [1] 3
Gross Unrealized Losses [1] $ (7) (2)
Fair Value [1] 21,824 22,737
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
Federal Government Sponsored Enterprise notes [Member]    
Schedule of Available-For-Sale Securities [Line Items]    
Amortized Cost 5,813  
Gross Unrealized Gains $ 10  
Gross Unrealized Losses  
Fair Value $ 5,823  
Mutual funds [Member]    
Schedule of Available-For-Sale Securities [Line Items]    
Amortized Cost $ 5,063 $ 5,000
Gross Unrealized Gains
Gross Unrealized Losses $ (231) $ (18)
Fair Value 4,832 4,982
Corporate bonds [Member]    
Schedule of Available-For-Sale Securities [Line Items]    
Amortized Cost 2,467  
Gross Unrealized Gains 6  
Gross Unrealized Losses (11)  
Fair Value 2,462  
U.S. Treasury notes [Member]    
Schedule of Available-For-Sale Securities [Line Items]    
Amortized Cost 2,785  
Gross Unrealized Gains $ 32  
Gross Unrealized Losses  
Fair Value $ 2,817  
Municipal Bonds [Member]    
Schedule of Available-For-Sale Securities [Line Items]    
Amortized Cost 9,028 9,125
Gross Unrealized Gains 12 9
Gross Unrealized Losses (1) (3)
Fair Value $ 9,039 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.