Fair Value Measurement (Details) - USD ($) $ in Thousands	Oct. 31, 2025	Jan. 31, 2025
Financial assets:
Total cash equivalents	$ 223,687	$ 311,942
Total marketable securities	776,135	844,435
Other investments carried at fair value	13,708	11,879
Total	1,013,530	1,168,256
Financial liabilities:
Contingent consideration	1,610
Total	1,610
Treasury bills and U.S. government securities
Financial assets:
Total marketable securities	600,165	703,319
Corporate bonds
Financial assets:
Total marketable securities	163,285	94,025
Commercial paper
Financial assets:
Total marketable securities	9,800	42,391
Yankee bonds
Financial assets:
Total marketable securities	2,885	4,700
Money market funds
Financial assets:
Total cash equivalents	171,318	311,942
Treasury bills
Financial assets:
Total cash equivalents	23,988
Commercial paper
Financial assets:
Total cash equivalents	28,381
Level 1
Financial assets:
Total cash equivalents	195,306	311,942
Total marketable securities	600,165	703,319
Other investments carried at fair value	0	0
Total	795,471	1,015,261
Financial liabilities:
Contingent consideration	0
Total	0
Level 1 | Treasury bills and U.S. government securities
Financial assets:
Total marketable securities	600,165	703,319
Level 1 | Corporate bonds
Financial assets:
Total marketable securities	0	0
Level 1 | Commercial paper
Financial assets:
Total marketable securities	0	0
Level 1 | Yankee bonds
Financial assets:
Total marketable securities	0	0
Level 1 | Money market funds
Financial assets:
Total cash equivalents	171,318	311,942
Level 1 | Treasury bills
Financial assets:
Total cash equivalents	23,988
Level 1 | Commercial paper
Financial assets:
Total cash equivalents	0
Level 2
Financial assets:
Total cash equivalents	28,381	0
Total marketable securities	175,970	141,116
Other investments carried at fair value	0	0
Total	204,351	141,116
Financial liabilities:
Contingent consideration	0
Total	0
Level 2 | Treasury bills and U.S. government securities
Financial assets:
Total marketable securities	0	0
Level 2 | Corporate bonds
Financial assets:
Total marketable securities	163,285	94,025
Level 2 | Commercial paper
Financial assets:
Total marketable securities	9,800	42,391
Level 2 | Yankee bonds
Financial assets:
Total marketable securities	2,885	4,700
Level 2 | Money market funds
Financial assets:
Total cash equivalents	0	0
Level 2 | Treasury bills
Financial assets:
Total cash equivalents	0
Level 2 | Commercial paper
Financial assets:
Total cash equivalents	28,381
Level 3
Financial assets:
Total cash equivalents	0	0
Total marketable securities	0	0
Other investments carried at fair value	13,708	11,879
Total	13,708	11,879
Financial liabilities:
Contingent consideration	1,610
Total	1,610
Level 3 | Treasury bills and U.S. government securities
Financial assets:
Total marketable securities	0	0
Level 3 | Corporate bonds
Financial assets:
Total marketable securities	0	0
Level 3 | Commercial paper
Financial assets:
Total marketable securities	0	0
Level 3 | Yankee bonds
Financial assets:
Total marketable securities	0	0
Level 3 | Money market funds
Financial assets:
Total cash equivalents	0	$ 0
Level 3 | Treasury bills
Financial assets:
Total cash equivalents	0
Level 3 | Commercial paper
Financial assets:
Total cash equivalents	$ 0