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Fair Value Measurements (Tables)
 3 Months Ended
Apr. 30, 2019
Fair Value Disclosures [Abstract]  
Summary of assets and liabilities measured at fair value on a recurring basis
The following table summarizes our financial assets that are measured at fair value on a recurring basis during the period:
 
April 30, 2019
(in thousands)
Amortized Cost
 
Gross Unrealized Gains
 
Gross Unrealized Losses
 
Estimated Fair Value
Level 1:
 
 
 
 
 
 
 
Cash equivalents
 
 
 
 
 
 
 
Money market funds
$
91,330

 
$
—

 
$
—

 
$
91,330

Level 2:
 
 
 
 
 
 
 
Cash equivalents
 
 
 
 
 
 
 
Commercial paper
4,998

 
—

 
—

 
4,998

Available-for-sale securities
 
 
 
 
 
 
 
Commercial paper
62,695

 
31

 
(8
)
 
62,718

Corporate notes and bonds
334,912

 
582

 
(34
)
 
335,460

U.S. Treasury securities
232,152

 
32

 
(15
)
 
232,169

U.S. government agency securities
69,977

 
12

 
(5
)
 
69,984

Level 2 total
704,734

 
657

 
(62
)
 
705,329

Total
$
796,064

 
$
657

 
$
(62
)
 
$
796,659

 
 
 
 
 
 
 
 
 
January 31, 2019
(in thousands)
Amortized Cost
 
Gross Unrealized Gains
 
Gross Unrealized Losses
 
Estimated Fair Value
Level 1:
 
 
 
 
 
 
 
Cash equivalents
 
 
 
 
 
 
 
Money market funds
$
350,063

 
$
—

 
$
—

 
$
350,063

Level 2:
 
 
 
 
 
 
 
Cash equivalents
 
 
 
 
 
 
 
Commercial paper
76,828

 
—

 
(11
)
 
76,817

Corporate notes and bonds
2,998

 
—

 
—

 
2,998

U.S. government agency securities
6,491

 
—

 
—

 
6,491

Available-for-sale securities
 
 
 
 
 
 
 
Commercial paper
86,655

 
4

 
(21
)
 
86,638

Corporate notes and bonds
287,496

 
389

 
(105
)
 
287,780

U.S. Treasury securities
4,982

 
—

 
(1
)
 
4,981

U.S. government agency securities
36,021

 
7

 
(4
)
 
36,024

Level 2 total
501,471

 
400

 
(142
)
 
501,729

Total
$
851,534

 
$
400

 
$
(142
)
 
$
851,792
Fair value of available-for-sale marketable securities by remaining contractual maturities
The fair value of our available-for-sale marketable securities as of April 30, 2019, by remaining contractual maturities, were as follows (in thousands):
Due in one year or less
$
515,648

Due in one to two years
184,683

 
$
700,331