Amount of investments including trading securities, available-for-sale securities, held-to-maturity securities, and short-term investments classified as other and current.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(4))
-URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(5))
-URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(1)(g))
-URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(2))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

Name:	us-gaap_ShortTermInvestments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Cash and Cash Equivalents, Investments and Fair Value Measurements - Fair Value of Hierarchy (Details) - USD ($) $ in Thousands	Jul. 31, 2022	Jan. 31, 2022
Short-term investments:
Certificates of deposit	$ 949,883	$ 374
Total assets measured and recorded at fair value		1,642,016
Certificates of deposit
Short-term investments:
Certificates of deposit		374
Money market funds
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
Short-term investments:
Certificates of deposit		0
Level 1 \| Money market funds
Cash equivalents:
Estimated Fair Value	$ 224,854	1,641,642
Level 2
Short-term investments:
Total assets measured and recorded at fair value		374
Level 2 \| Certificates of deposit
Short-term investments:
Certificates of deposit		374
Level 2 \| Money market funds
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
Short-term investments:
Certificates of deposit		0
Level 3 \| Money market funds
Cash equivalents:
Estimated Fair Value		$ 0