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Marketable Securities (Tables)
3 Months Ended
Apr. 30, 2022
Investments, Debt and Equity Securities [Abstract]  
Components of Marketable Securities
Marketable securities consist of the following for the periods presented (in thousands):
April 30, 2022
Cost or Amortized CostGross Unrealized GainsGross Unrealized LossesTotal Estimated Fair Value
U.S. government securities$354,781 $$(870)$353,913 
Foreign bonds2,035 — (15)2,020 
Commercial paper9,699 — — 9,699 
Corporate debt securities71,279 14 (344)70,949 
Asset-backed securities2,914 — (9)2,905 
Total$440,708 $16 $(1,238)$439,486 
January 31, 2022
Cost or Amortized CostGross Unrealized GainsGross Unrealized LossesTotal Estimated Fair Value
U.S. government securities$4,021 $— $(15)$4,006 
Foreign bonds3,203 — — 3,203 
Commercial paper18,993 — — 18,993 
Corporate debt securities3,025 — (5)3,020 
Asset-backed securities5,941 — (7)5,934 
Total$35,183 $— $(27)$35,156 
Marketable Securities by Contractual Maturity The contractual maturities of the investments classified as available-for-sale marketable securities are as follows (in thousands):
April 30, 2022
Amortized CostEstimated Fair Value
Due within 1 year$267,854 $267,605 
Due in 1 year through 5 years172,854 171,881 
Total$440,708 $439,486 
January 31, 2022
Amortized CostEstimated Fair Value
Due within 1 year$33,671 $33,646 
Due in 1 year through 5 years1,512 1,510 
Total$35,183 $35,156 
Investment Income
Investment income consists of interest income and accretion income/amortization expense on our cash, cash equivalents and marketable securities. Investment income is included within Other income, net on the consolidated statement of operations. The components of investment income were as follows (in thousands):
Three Months Ended
April 30,
20222021
Interest income$443 $223 
Amortization of discount/premium, net13 (160)
Investment income$456 $63