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Investments (Tables)
 3 Months Ended
Apr. 30, 2019
Investments, Debt and Equity Securities [Abstract]  
Summary of Debt Securities
As of April 30, 2019, debt securities consisted of the following (in thousands):
 
Amortized Cost
 
Unrealized Gains
 
Unrealized Losses
 
Aggregate Fair Value
U.S. treasury securities
$
484,846

 
$
214

 
$
(79
)
 
$
484,981

U.S. agency obligations
188,057

 
117

 
(61
)
 
188,113

Corporate bonds
373,946

 
637

 
(121
)
 
374,462

Commercial paper
282,527

 
2

 
—

 
282,529

 
$
1,329,376

 
$
970

 
$
(261
)
 
$
1,330,085

Included in cash and cash equivalents
$
219,944

 
$
—

 
$
—

 
$
219,944

Included in marketable securities
$
1,109,432

 
$
970

 
$
(261
)
 
$
1,110,141

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
 
April 30, 2019
 
January 31, 2019
Money market funds
Cash and cash equivalents
 
$
396,940

 
$
237,071

Marketable equity investments
Marketable securities
 
—

 
44,127

Non-marketable equity investments
Other assets
 
39,125

 
36,925

 
 
 
$
436,065

 
$
318,123