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Financial Instruments (Tables)
 3 Months Ended
Apr. 30, 2024
Fair Value Disclosures [Abstract]  
Cash, Cash Equivalents and Investments The following table summarizes the Company’s cash and available-for-sale marketable securities’ amortized cost, gross unrealized gains, gross unrealized losses, and estimated fair value by significant investment category reported as cash and cash equivalents or short-term investments (in thousands):
Reported as
April 30, 2024Amortized CostGross Unrealized GainsGross
Unrealized
Losses		Estimated Fair ValueCash and Cash EquivalentsShort-Term Investments
Cash:$147,062 $— $— $147,062 $147,062 $— 
Level 1:
Money market funds352,389 — — 352,389 352,389 — 
U.S. Treasuries47,379 — (48)47,331 — 47,331 
Subtotal399,768 — (48)399,720 352,389 47,331 
Level 2:
Commercial paper29,368 — (8)29,360 — 29,360 
Corporate bonds18,128 2 (14)18,116 3,163 14,953 
U.S. government agencies$12,069 $— $(7)$12,062 $— $12,062 
Subtotal$59,565 $2 $(29)$59,538 $3,163 $56,375 
Total$606,395 $2 $(77)$606,320 $502,614 $103,706 
Reported as
January 31, 2024Amortized CostGross Unrealized GainsGross
Unrealized
Losses		Estimated Fair ValueCash and Cash EquivalentsShort-Term Investments
Cash:$72,420 $— $— $72,420 $72,420 $— 
Level 1:
Money market funds47,696 — — 47,696 47,696 — 
U.S. Treasuries86,429 70 (13)86,486 — 86,486 
Subtotal134,125 70 (13)134,182 47,696 86,486 
Level 2:
Commercial paper33,019 3 (3)33,019 9,915 23,104 
Corporate bonds17,883 30 (3)17,910 — 17,910 
U.S. government agencies$21,703 $27 $(10)$21,720 $— $21,720 
Subtotal$72,605 $60 $(16)$72,649 $9,915 $62,734 
Total$279,150 $130 $(29)$279,251 $130,031 $149,220 
Investments Classified by Contractual Maturity Date
The following table summarizes the estimated fair value of the Company’s investments by their remaining contractual maturity dates (in thousands):
April 30, 2024
Due within one year$101,729 
Due between one to two years1,977 
Total$103,706