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Convertible Senior Notes (Tables)
 12 Months Ended
Jan. 31, 2020
Debt Disclosure [Abstract]  
Convertible debt schedules
The net carrying amount of the liability component of the 2024 Notes immediately prior to the repurchase was as follows (in thousands):
 
January 14, 2020
 
2024 Notes Total
 
2024 Notes Partial Repurchase
Principal
$
300,000

 
$
209,998

Unamortized debt discount
(65,366
)
 
(45,756
)
Unamortized debt issuance costs
(5,175
)
 
(3,623
)
Net carrying amount
$
229,459

 
$
160,619

The 2024 Notes Partial Repurchase resulted in a loss of early extinguishment of debt calculated as follows (in thousands):
 
January 14, 2020
Cash consideration allocated to the liability component
$
175,141

Less: Net carrying amount of the liability component associated with the 2024 Notes Partial Repurchase
(160,619
)
Loss from 2024 Notes Partial Repurchase
$
14,522


The net carrying amounts of the liability component of the 2024 Notes and 2026 Notes were as follows (in thousands):
 
January 31, 2020
 
January 31, 2019
 
2024 Notes *
 
2026 Notes
 
2024 Notes
Principal
$
90,002

 
$
1,150,000

 
$
300,000

Unamortized debt discount
(19,435
)
 
(292,932
)
 
(77,211
)
Unamortized debt issuance costs
(1,541
)
 
(15,019
)
 
(5,931
)
Net carrying amount
$
69,026

 
$
842,049

 
$
216,858

*Reflects the impact of the 2024 Notes Partial Repurchase on January 14, 2020.
Interest expense related to Notes
The following table sets forth the interest expense related to the 2024 Notes and 2026 Notes (in thousands):
 
Year Ended January 31, 2020
 
Year Ended January 31, 2019
 
2024 Notes
 
2026 Notes
 
2024 Notes
Contractual interest expense
$
2,178

 
$
136

 
$
1,325

Amortization of debt discount
12,021

 
1,977

 
6,956

Amortization of issuance costs
767

 
82

 
415

Total
$
14,966

 
$
2,195

 
$
8,696