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Convertible Senior Notes (Tables)
 3 Months Ended
Apr. 30, 2020
Debt Disclosure [Abstract]  
Convertible debt schedules
The net carrying amounts of the liability component of the 2024 Notes and 2026 Notes were as follows (in thousands):
 
April 30, 2020
 
2024 Notes
 
2026 Notes
Principal
$
90,001

 
$
1,150,000

Unamortized debt discount
(18,465
)
 
(282,386
)
Unamortized debt issuance costs
(1,475
)
 
(14,577
)
Net carrying amount
$
70,061

 
$
853,037
Interest expense related to Notes
The following table sets forth the interest expense related to the 2024 Notes and 2026 Notes (in thousands):
 
Three Months Ended April 30, 2020
 
Three Months Ended April 30, 2019
 
2024 Notes
 
2026 Notes
 
2024 Notes
 
2026 Notes
Contractual interest expense
$
169

 
$
719

 
$
563

 
$
—

Amortization of debt discount
970

 
10,547

 
3,033

 
—

Amortization of issuance costs
65

 
441

 
188

 
—

Total
$
1,204

 
$
11,707

 
$
3,784

 
$
—