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Convertible Senior Notes (Tables)
 12 Months Ended
Jan. 31, 2022
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 Total2024 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$14,522 
The net carrying amounts of the liability component of the 2024 Notes and 2026 Notes were as follows for the periods presented (in thousands):
January 31, 2022January 31, 2021
2024 Notes (1)
2026 Notes2024 Notes2026 Notes
Principal$— $1,149,988 $90,000 $1,150,000 
Unamortized debt discount (2)
— — (15,459)(249,907)
Unamortized debt issuance costs— (13,467)(1,265)(13,174)
Net carrying amount (2)
$— $1,136,521 $73,276 $886,919 
(1) The 2024 Notes were fully converted as of December 3, 2021, following the Redemption Notice.
(2) The net carrying amount was increased on February 1, 2021, as a result of the adoption of ASU 2020-06. Refer also to Note 2. Summary of Significant Accounting Policies for further information.
Interest expense related to Notes
The following table sets forth the interest expense related to the 2024 Notes and 2026 Notes for the periods presented (in thousands):
January 31, 2022January 31, 2021January 31, 2020
2024 Notes
2026 Notes
2024 Notes
2026 Notes
2024 Notes
2026 Notes
Contractual interest expense
$168 $2,876 $675 $2,875 $2,178 $136 
Amortization of debt discount (1)
— — 3,976 43,026 12,021 1,977 
Amortization of issuance costs (1)
647 3,358 276 1,851 767 82 
Total
$815 $6,234 $4,927 $47,752 $14,966 $2,195 
(1) The decrease in total interest expense for the year ended January 31, 2022, as compared to the respective prior year was due to the derecognition of the unamortized debt discount, partially offset by the increase in the amortization of issuance costs previously
recognized in equity. These changes were the result of the Company’s adoption of ASU 2020-06, as of February 1, 2021, as described in Note 2, Summary of Significant Accounting Policies.