Cash and Cash Equivalents, Investments and Fair Value Measurements - Fair Value of Hierarchy (Details) - USD ($) $ in Thousands	Apr. 30, 2022	Jan. 31, 2022
Short-term investments:
Certificates of deposit	$ 851,418	$ 374
Total assets measured and recorded at fair value		1,642,016
Certificates of Deposit [Member]
Short-term investments:
Certificates of deposit		374
Money Market Funds [Member]
Cash equivalents:
Estimated Fair Value		1,641,642
Level 1
Short-term investments:
Total assets measured and recorded at fair value		1,641,642
Level 1 | Certificates of Deposit [Member]
Short-term investments:
Certificates of deposit		0
Level 1 | Money Market Funds [Member]
Cash equivalents:
Estimated Fair Value	$ 592,161	1,641,642
Level 2
Short-term investments:
Total assets measured and recorded at fair value		374
Level 2 | Certificates of Deposit [Member]
Short-term investments:
Certificates of deposit		374
Level 2 | Money Market Funds [Member]
Cash equivalents:
Estimated Fair Value		0
Level 3
Short-term investments:
Total assets measured and recorded at fair value		0
Level 3 | Certificates of Deposit [Member]
Short-term investments:
Certificates of deposit		0
Level 3 | Money Market Funds [Member]
Cash equivalents:
Estimated Fair Value		$ 0