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Investments (Tables)
 6 Months Ended
Jul. 31, 2019
Investments, Debt and Equity Securities [Abstract]  
Summary of Debt Securities
As of July 31, 2019, debt securities consisted of the following (in thousands):
 
Amortized Cost
 
Unrealized Gains
 
Unrealized Losses
 
Aggregate Fair Value
U.S. treasury securities
$
524,462

 
$
554

 
$
(31
)
 
$
524,985

U.S. agency obligations
240,029

 
229

 
(40
)
 
240,218

Corporate bonds
438,825

 
1,232

 
(134
)
 
439,923

Commercial paper
182,886

 
—

 
—

 
182,886

 
$
1,386,202

 
$
2,015

 
$
(205
)
 
$
1,388,012

Included in cash and cash equivalents
$
81,003

 
$
3

 
$
—

 
$
81,006

Included in marketable securities
$
1,305,199

 
$
2,012

 
$
(205
)
 
$
1,307,006

As of January 31, 2019, debt securities consisted of the following (in thousands):
 
Amortized Cost
 
Unrealized Gains
 
Unrealized Losses
 
Aggregate Fair Value
U.S. treasury securities
$
396,347

 
$
61

 
$
(178
)
 
$
396,230

U.S. agency obligations
241,914

 
73

 
(151
)
 
241,836

Corporate bonds
419,784

 
336

 
(352
)
 
419,768

Commercial paper
254,175

 
—

 
(2
)
 
254,173

 
$
1,312,220

 
$
470

 
$
(683
)
 
$
1,312,007

Included in cash and cash equivalents
$
216,270

 
$
—

 
$
—

 
$
216,270

Included in marketable securities
$
1,095,950

 
$
470

 
$
(683
)
 
$
1,095,737
Equity Investments
Equity investments consisted of the following (in thousands):
 
Condensed Consolidated Balance Sheets Location
 
July 31, 2019
 
January 31, 2019
Money market funds (1)
Cash and cash equivalents
 
$
348,109

 
$
237,071

Marketable equity investments (1)
Marketable securities
 
—

 
44,127

Non-marketable equity investments (2)
Other assets
 
47,060

 
36,925

 
 
 
$
395,169

 
$
318,123


(1) 
Investments with readily determinable fair values.
(2) 
Investments in privately held companies without readily determinable fair values.