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Convertible Senior Notes (Tables)
 6 Months Ended
Jul. 31, 2022
Debt Disclosure [Abstract]  
Convertible debt schedules
The net carrying amounts of the Company’s convertible notes were as follows for the periods presented (in thousands):
July 31, 2022January 31, 2022
2026 Notes2026 Notes
Principal$1,149,982 $1,149,988 
Unamortized debt issuance costs(11,782)(13,467)
Net carrying amount$1,138,200 $1,136,521