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Convertible Senior Notes, Net (Tables)
 3 Months Ended
Apr. 30, 2018
Debt Disclosure [Abstract]  
Schedule of Senior Notes
The Notes, net consisted of the following (in thousands):
 
April 30, 2018
 
January 31, 2018
 
2018 Notes
 
2020 Notes
 
2022 Notes
 
2018 Notes
 
2020 Notes
 
2022 Notes
Principal amounts:
 
 
 
 
 
 
 
 
 
 
 
Principal
$
350,000

 
$
250,000

 
$
1,150,000

 
$
350,000

 
$
250,000

 
$
1,150,000

Unamortized debt discount
(3,567
)
 
(24,407
)
 
(198,127
)
 
(7,850
)
 
(26,968
)
 
(208,188
)
Unamortized debt issuance costs
(289
)
 
(1,486
)
 
(12,631
)
 
(641
)
 
(1,654
)
 
(13,345
)
Net carrying amount
$
346,144

 
$
224,107

 
$
939,242

 
$
341,509

 
$
221,378

 
$
928,467

Carrying amount of the equity component (1)
$
74,892

 
$
66,007

 
$
219,702

 
$
74,892

 
$
66,007

 
$
219,702

(1) 
Included on the condensed 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):
 
Three Months Ended April 30,
 
2018
 
2017
 
2018 Notes
 
2020 Notes
 
2022 Notes
 
2018 Notes
 
2020 Notes
 
2022 Notes
Contractual interest expense
$
656

 
$
937

 
$
719

 
$
656

 
$
938

 
$
—

Interest cost related to amortization of debt issuance costs
352

 
168

 
714

 
352

 
168

 
—

Interest cost related to amortization of the debt discount
4,283

 
2,561

 
10,061

 
4,044

 
2,406

 
—