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Stockholders' Equity (Tables)
 6 Months Ended
Jul. 31, 2019
Equity [Abstract]  
Schedule of stock option activity
Option activity for the six months ended July 31, 2019, was as follows:
(in thousands, except per share and years data)
Number of Options Outstanding
 
Weighted-Average Exercise Price Per Share
 
Weighted-Average Remaining Contractual Term (Years)
 
Aggregate Intrinsic Value
Outstanding at January 31, 2019
13,648

 
$
12.27

 
5.38
 
$
507,371

Options exercised
(3,869
)
 
9.86

 
 
 
 
Options canceled/expired
(27
)
 
17.67

 
 
 
 
Outstanding at July 31, 2019
9,752

 
$
13.22

 
5.28
 
$
375,487

Vested and expected to vest at July 31, 2019
9,653

 
$
13.17

 
5.26
 
$
372,090

Exercisable at July 31, 2019
8,518

 
$
12.57

 
4.97
 
$
333,456
Schedule of RSU activity
RSU activity for the six months ended July 31, 2019, was as follows:
(in thousands, except per share data)
Number of Units
 
Weighted-Average Grant Date Fair Value
Unvested at January 31, 2019
17,142

 
$
34.56

Granted
4,760

 
52.91

Vested
(4,180
)
 
26.07

Canceled
(1,283
)
 
37.52

Unvested at July 31, 2019
16,439

 
$
41.78