Fair Value Measurements - Narrative (Details) - USD ($)	3 Months Ended	9 Months Ended
Oct. 31, 2021	Oct. 31, 2021
Fair Value Disclosures [Abstract]
Debt securities, available-for-sale, unrealized gain (loss)	$ 0	$ 0

Amount of unrealized gain (loss) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

No definition available.

Name:	us-gaap_DebtSecuritiesAvailableForSaleUnrealizedGainLoss
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration