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Convertible Senior Notes, Net (Tables)
 12 Months Ended
Jan. 31, 2019
Debt Disclosure [Abstract]  
Schedule of Senior Notes
The Notes, net consisted of the following (in thousands):
 
 
January 31, 2019
 
January 31, 2018
 
 
2018 Notes
 
2020 Notes
 
2022 Notes
 
2018 Notes
 
2020 Notes
 
2022 Notes
Principal amounts:
 
 
 
 
 
 
 
 
 
 
 
 
Principal
 
$
—

 
$
249,975

 
$
1,150,000

 
$
350,000

 
$
250,000

 
$
1,150,000

Unamortized debt discount
 
—

 
(16,480
)
 
(167,249
)
 
(7,850
)
 
(26,968
)
 
(208,188
)
Unamortized debt issuance costs
 
—

 
(981
)
 
(10,487
)
 
(641
)
 
(1,654
)
 
(13,345
)
Net carrying amount
 
$
—

 
$
232,514

 
$
972,264

 
$
341,509

 
$
221,378

 
$
928,467

Carrying amount of the equity component (1)
 
$
74,887

 
$
66,007

 
$
219,702

 
$
74,892

 
$
66,007

 
$
219,702

(1) 
Included on the consolidated balance sheets within Additional paid-in capital, net of $2 million, $2 million, and $4 million for the 2018 Notes, 2020 Notes, and 2022 Notes, respectively, in equity issuance costs.
Schedule of Interest Expense Recognized Related to Convertible Senior Notes
The following table sets forth total interest expense recognized related to the Notes (in thousands):
 
 
Year Ended January 31,
 
 
2019
 
2018
 
2017
 
 
2018 Notes
 
2020 Notes
 
2022 Notes
 
2018 Notes
 
2020 Notes
 
2022 Notes
 
2018 Notes
 
2020 Notes
 
2022 Notes
Contractual interest expense
 
$
1,196

 
$
3,750

 
$
2,875

 
$
2,625

 
$
3,750

 
$
1,086

 
$
2,625

 
$
3,750

 
$
—

Interest cost related to amortization of debt issuance costs
 
641

 
673

 
2,858

 
1,409

 
673

 
1,080

 
1,408

 
675

 
—

Interest cost related to amortization of the debt discount
 
7,850

 
10,488

 
40,939

 
16,530

 
9,852

 
14,989

 
15,607

 
9,257

 
—