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Basis of Presentation and Summary of Significant Accounting Policies - (Tables)
 6 Months Ended
Jul. 31, 2019
Accounting Policies [Abstract]  
Deferred Commissions
Changes in total deferred commissions during the periods presented are as follows (in thousands):
 
Three Months Ended July 31,
 
Six Months Ended July 31,
 
2018
 
2019
 
2018
 
2019
Beginning balance (1)
$
86,044

 
$
113,257

 
$
87,313

 
$
114,973

Additions
24,582

 
30,074

 
40,003

 
48,310

Recognition of deferred commissions
(19,157
)
 
(24,763
)
 
(35,847
)
 
(44,715
)
Ending balance
$
91,469

 
$
118,568

 
$
91,469

 
$
118,568

____________________________________
 
(1) Balance as of January 31, 2018 was adjusted to reflect the adoption of ASC 606.
Deferred Revenue
Changes in total deferred revenue during the periods presented are as follows (in thousands):
 
Three Months Ended July 31,
 
Six Months Ended July 31,
 
2018
 
2019
 
2018
 
2019
Beginning balance (1)
$
388,614

 
$
564,230

 
$
374,102

 
$
535,920

Additions
92,511

 
140,548

 
167,782

 
258,441

Recognition of deferred revenue
(67,878
)
 
(97,515
)
 
(128,637
)
 
(187,098
)
Ending balance
$
413,247

 
$
607,263

 
$
413,247

 
$
607,263

____________________________________
 
(1) Balance as of January 31, 2018 was adjusted to reflect the adoption of ASC 606.