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Convertible Senior Notes (Tables)
 9 Months Ended
Oct. 31, 2021
Debt Disclosure [Abstract]  
Convertible debt schedules
The net carrying amounts of the liability component of the 2024 Notes and the 2026 Notes were as follows for the periods presented (in thousands):
October 31, 2021January 31, 2021
2024 Notes2026 Notes2024 Notes2026 Notes
Principal$1,863 
(1)
$1,149,991 $90,000 $1,150,000 
Unamortized debt discount (2)
— — (15,459)(249,907)
Unamortized debt issuance costs(25)(14,307)(1,265)(13,174)
Net carrying amount (2)
$1,838 $1,135,684 $73,276 $886,919 
(1) The aggregate principal amount outstanding of the 2024 Notes is presented within Other Accrued Liabilities on the Company’s condensed consolidated balance sheet as of October 31, 2021.
(2) The net carrying amount was increased on February 1, 2021 as a result of the adoption of ASU 2020-06. Refer to Note 2, Summary of Significant Accounting Policies, in this Quarterly Report on Form 10-Q for further information.
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 October 31,Nine Months Ended October 31,
2021202020212020
2024 Notes
2026 Notes
2024 Notes
2026 Notes
2024 Notes
2026 Notes
2024 Notes
2026 Notes
Contractual interest expense$4 $719 $168 $718 $203 $2,156 $506 $2,156 
Amortization of debt discount (1)
— — 1,002 10,826 — — 2,958 32,058 
Amortization of issuance costs (1)
2 840 70 469 646 2,515 203 1,366 
Total (1)
$6 $1,559 $1,240 $12,013 $849 $4,671 $3,667 $35,580 
(1) The decrease in total interest expense for the three and nine months ended October 31, 2021 as compared to the respective prior-year periods 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.