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Debt and Financing Arrangements (Tables)
3 Months Ended
Apr. 30, 2021
Debt Disclosure [Abstract]  
Net Carrying Amount of Liability and Equity Components of Convertible Notes The net carrying amount of the liability component of the Notes as of April 30, 2021 (post-ASU 2020-06 adoption) and as of January 31, 2021 (pre-ASU 2020-06 adoption) was as follows:
As of April 30, 2021As of January 31, 2021
(in thousands)
Principal$287,500 $287,500 
Less: unamortized debt discount— (63,664)
Less: unamortized issuance costs(7,797)(6,308)
Net carrying amount$279,703 $217,528 
The net carrying amount of the equity component of the Notes as of April 30, 2021 (post-ASU 2020-06 adoption) and as of January 31, 2021 (pre-ASU 2020-06 adoption) was as follows:
As of April 30, 2021As of January 31, 2021
(in thousands)
Proceeds allocated to the conversion options (debt discount)$— $70,768 
Less: issuance costs— (2,290)
Carrying amount of the equity component$— $68,478 
Interest expense recognized related to the Notes is as follows. There was no interest expense associated with the Notes for the three months ended April 30, 2020.
Three Months Ended April 30, 2021
(in thousands)
Contractual interest expense$879 
Amortization of debt issuance costs438 
Total interest expense related to the Notes$1,317