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Fair Value of Financial Instruments (Tables)
 6 Months Ended
Jul. 31, 2025
Fair Value Disclosures [Abstract]  
Schedule of Cash, Cash Equivalent, and Investment 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
July 31, 2025Amortized CostGross Unrealized GainsGross
Unrealized
Losses		Estimated Fair ValueCash and Cash EquivalentsShort-Term Investments
Cash:$72,680 $— $— $72,680 $72,680 $— 
Level 1:
Money market funds174,327 — — 174,327 174,327 — 
U.S. Treasuries544,143 41 (361)543,823 59,797 484,026 
Subtotal718,470 41 (361)718,150 234,124 484,026 
Level 2:
Certificate of deposit7,631 12 — 7,643 — 7,643 
Commercial paper33,280 — (61)33,219 — 33,219 
Corporate bonds685,970 108 (640)685,438 15,898 669,540 
U.S. government agencies5,890 — (9)5,881 — 5,881 
Subtotal732,771 120 (710)732,181 15,898 716,283 
Total$1,523,921 $161 $(1,071)$1,523,011 $322,702 $1,200,309 
Reported as
January 31, 2025Amortized CostGross Unrealized GainsGross
Unrealized
Losses		Estimated Fair ValueCash and Cash EquivalentsShort-Term Investments
Cash:$75,541 $— $— $75,541 $75,541 $— 
Level 1:
Money market funds96,423 — — 96,423 96,423 — 
U.S. Treasuries259,327 345 (76)259,596 — 259,596 
Subtotal355,750 345 (76)356,019 96,423 259,596 
Level 2:
Commercial paper88,732 8 (3)88,737 14,367 74,370 
Corporate bonds184,742 195 (90)184,847 — 184,847 
Subtotal273,474 203 (93)273,584 14,367 259,217 
Total$704,765 $548 $(169)$705,144 $186,331 $518,813 
Schedule of 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):
July 31, 2025
Due within one year$686,987 
Due between one to two years513,322 
Total$1,200,309