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Convertible Senior Notes (Tables)
 3 Months Ended
Apr. 30, 2021
Debt Disclosure [Abstract]  
Schedule of Components of Convertible Senior Notes
The 2026 Notes, 2025 Notes and 2023 Notes consisted of the following (in thousands):
 
As ofAs of
April 30, 2021January 31, 2021
2026 Notes2025 Notes2023 Notes2026 Notes2025 Notes2023 Notes
Liability:
Principal
$1,380,000 $804,997 $5,877 $1,380,000 $804,999 $8,832 
Unamortized debt discount and issuance costs (1)
(465,006)(193,811)(663)(482,475)(203,638)(1,125)
Net carrying amount
$914,994 $611,186 $5,214 $897,525 $601,361 $7,707 
Carrying amount of the equity component (2)
$501,053 $246,966 $1,544 $501,053 $246,966 $1,560 
(1)Included in the condensed consolidated balance sheets within Convertible senior notes, net and amortized over the remaining lives of the convertible senior notes. The 2026 Notes are classified as long-term liabilities, and the 2025 Notes and 2023 Notes are classified as current liabilities.
(2)Included in the condensed consolidated balance sheets within additional paid-in capital and temporary equity.