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Marketable Securities (Details) - USD ($)
$ in Thousands
Jan. 31, 2018
Jul. 31, 2017
Available-for-sale securities:    
Amortized Cost $ 46,318 $ 58,238
Gross Unrealized Gains, Total 42 82
Gross Unrealized Losses, Total (158) (48)
Fair Value 46,202 58,272
Certificates of deposit [Member]    
Available-for-sale securities:    
Amortized Cost [1] 24,441 29,011
Gross Unrealized Gains [1] 2 1
Unrealized Losses (1) [2] (7) [1]
Fair Value [1] 24,442 29,005
Federal Government Sponsored Enterprise notes [Member]    
Available-for-sale securities:    
Amortized Cost 3,216 3,992
Gross Unrealized Gains
Unrealized Losses (26) (14)
Fair Value 3,190 3,978
International agency notes [Member]    
Available-for-sale securities:    
Amortized Cost 399 291
Gross Unrealized Gains
Unrealized Losses (9)
Fair Value 390 291
Mutual funds [Member]    
Available-for-sale securities:    
Amortized Cost 5,425 5,353
Gross Unrealized Gains 40 77
Gross Unrealized Losses
Fair Value 5,465 5,430
Corporate bonds [Member]    
Available-for-sale securities:    
Amortized Cost 3,332 4,643
Gross Unrealized Gains
Unrealized Losses (39)
Fair Value 3,293 4,643
Equity [Member]    
Available-for-sale securities:    
Amortized Cost 79 74
Gross Unrealized Gains  
Gross Unrealized Losses (3) (26)
Fair Value 76 48
U.S. Treasury notes [Member]    
Available-for-sale securities:    
Amortized Cost 5,397 6,673
Gross Unrealized Gains
Unrealized Losses (76)
Fair Value 5,321 6,673
Municipal bonds [Member]    
Available-for-sale securities:    
Amortized Cost 4,029 8,201
Gross Unrealized Gains 4
Unrealized Losses (4) (1)
Fair Value $ 4,025 $ 8,204
[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.
[2] Stock-based compensation included in selling, general and administrative expenses