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Financial Instruments (Tables)
 3 Months Ended
Apr. 30, 2025
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, 2025Amortized CostGross Unrealized GainsGross
Unrealized
Losses		Estimated Fair ValueCash and Cash EquivalentsShort-Term Investments
Cash:$60,469 $— $— $60,469 $60,469 $— 
Level 1:
Money market funds214,174 — — 214,174 214,174 — 
U.S. Treasuries266,825 433 (14)267,244 5,319 261,925 
Subtotal480,999 433 (14)481,418 219,493 261,925 
Level 2:
Certificate of deposit7,631 2 — 7,633 — 7,633 
Commercial paper44,930 2 (65)44,867 — 44,867 
Corporate bonds167,608 124 (62)167,670 4,036 163,634 
Subtotal220,169 128 (127)220,170 4,036 216,134 
Total$761,637 $561 $(141)$762,057 $283,998 $478,059 
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 
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, 2025
Due within one year$406,336 
Due between one to two years71,723 
Total$478,059