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Short-Term and Long-Term Investments (Tables)
 6 Months Ended
Apr. 30, 2019
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):

 
April 30, 2019
 
Amortized Cost
 
Gross Unrealized
Gains
 
Gross
Unrealized
Losses
 
Estimated Fair
Value
U.S. government obligations:
 
 
 
 
 
 
 
Included in short-term investments
$
119,316

 
$
47

 
$
(36
)
 
$
119,327

 
$
119,316

 
$
47

 
$
(36
)
 
$
119,327


 
October 31, 2018
 
Amortized Cost
 
Gross Unrealized
Gains
 
Gross Unrealized
Losses
 
Estimated Fair
Value
U.S. government obligations:
 
 
 
 
 
 
 
Included in short-term investments
$
139,365

 
$
—

 
$
(347
)
 
$
139,018

Included in long-term investments
59,029

 
—

 
(59
)
 
58,970

 
$
198,394

 
$
—

 
$
(406
)
 
$
197,988

 
 
 
 
 
 
 
 
Commercial paper:
 
 
 
 
 
 
 
Included in short-term investments
$
9,963

 
$
—

 
$
—

 
$
9,963

 
$
9,963

 
$
—

 
$
—

 
$
9,963
Schedule of Legal Maturities of Debt Investments
The following table summarizes the final legal maturities of debt investments at April 30, 2019 (in thousands):

 
Amortized
Cost
 
Estimated
Fair Value
Less than one year
$
119,316

 
$
119,327