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SHORT-TERM AND LONG-TERM INVESTMENTS (Tables)
 3 Months Ended
Jan. 31, 2016
Investments, Debt and Equity Securities [Abstract]  
Short-term and long-term investments
As of the dates indicated, investments are comprised of the following (in thousands):

 
January 31, 2016
 
Amortized Cost
 
Gross Unrealized
Gains
 
Gross
Unrealized
Losses
 
Estimated Fair
Value
U.S. government obligations:
 
 
 
 
 
 
 
Included in short-term investments
$
180,087

 
$
30

 
(83
)
 
$
180,034

Included in long-term investments
125,041

 
117

 
(98
)
 
125,060

 
$
305,128

 
$
147

 
$
(181
)
 
$
305,094

 
 
 
 
 
 
 
 
Commercial paper:
 
 
 
 
 
 
 
Included in short-term investments
$
29,976

 
—

 
—

 
$
29,976

 
$
29,976

 
$
—

 
$
—

 
$
29,976


 
October 31, 2015
 
Amortized Cost
 
Gross Unrealized
Gains
 
Gross Unrealized
Losses
 
Estimated Fair
Value
U.S. government obligations:
 
 
 
 
 
 
 
Included in short-term investments
$
110,108

 
$
10

 
$
—

 
$
110,118

Included in long-term investments
95,171

 
—

 
(66
)
 
95,105

 
$
205,279

 
$
10

 
$
(66
)
 
$
205,223

 
 
 
 
 
 
 
 
Commercial paper:
 
 
 
 
 
 
 
Included in short-term investments
24,989

 
—

 
—

 
24,989

 
$
24,989

 
$
—

 
$
—

 
$
24,989
Legal maturities of debt investments
The following table summarizes the final legal maturities of debt investments at January 31, 2016 (in thousands):

 
Amortized
Cost
 
Estimated
Fair Value
Less than one year
$
210,063

 
$
210,010

Due in 1-2 years
125,041

 
125,060

 
$
335,104

 
$
335,070