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SHORT-TERM AND LONG-TERM INVESTMENTS (Tables)
 6 Months Ended
Apr. 30, 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):

 
April 30, 2016
 
Amortized Cost
 
Gross Unrealized
Gains
 
Gross
Unrealized
Losses
 
Estimated Fair
Value
U.S. government obligations:
 
 
 
 
 
 
 
Included in short-term investments
$
190,123

 
$
87

 
(28
)
 
$
190,182

Included in long-term investments
125,091

 
157

 
(15
)
 
125,233

 
$
315,214

 
$
244

 
$
(43
)
 
$
315,415

 
 
 
 
 
 
 
 
Commercial paper:
 
 
 
 
 
 
 
Included in short-term investments
$
4,997

 
—

 
—

 
$
4,997

 
$
4,997

 
$
—

 
$
—

 
$
4,997


 
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 April 30, 2016 (in thousands):

 
Amortized
Cost
 
Estimated
Fair Value
Less than one year
$
195,120

 
$
195,179

Due in 1-2 years
125,091

 
125,233

 
$
320,211

 
$
320,412