Cash Equivalents and Investments - Narrative (Details) - USD ($) $ in Millions	6 Months Ended
Jul. 31, 2022	Jan. 31, 2022
Debt Securities, Available-for-sale, Unrealized Loss Position
Contractual maturities of available-for-sale debt securities, maximum	36 months
Prepaid Expenses and Other Current Assets
Debt Securities, Available-for-sale, Unrealized Loss Position
Interest receivable, current	$ 14.2	$ 14.1

Carrying amount as of the balance sheet date of current interest earned but not received. Also called accrued interest or accrued interest receivable. For classified balance sheets, represents the current amount receivable, that is amounts expected to be collected within one year or the normal operating cycle, if longer.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(3)(a)(4))
-URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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