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Short-Term and Long-Term Investments (Tables)
 3 Months Ended
Jan. 31, 2020
Investments, Debt and Equity Securities [Abstract]  
Schedule of Short-Term and Long-Term Investments

As of the dates indicated, investments are comprised of the following (in thousands):

 
January 31, 2020
 
Amortized Cost
 
Gross Unrealized
Gains
 
Gross
Unrealized
Losses
 
Estimated Fair
Value
U.S. government obligations:
 
 
 
 
 
 
 
Included in short-term investments
$
109,962

 
$
105

 
$
—

 
$
110,067

Included in long-term investments
10,073

 
3

 
—

 
10,076

 
$
120,035

 
$
108

 
$
—

 
$
120,143


 
October 31, 2019
 
Amortized Cost
 
Gross Unrealized
Gains
 
Gross Unrealized
Losses
 
Estimated Fair
Value
U.S. government obligations:
 
 
 
 
 
 
 
Included in short-term investments
$
109,715

 
$
225

 
$
—

 
$
109,940

Included in long-term investments
10,017

 
—

 
(3
)
 
10,014

 
$
119,732

 
$
225

 
$
(3
)
 
$
119,954
Schedule of Legal Maturities of Debt Investments
The following table summarizes the final legal maturities of debt investments at January 31, 2020 (in thousands):
 
Amortized
Cost
 
Estimated
Fair Value
Less than one year
$
109,962

 
$
110,067

Due in 1-2 years
10,073

 
10,076

 
$
120,035

 
$
120,143