Commitments and Contingencies - Additional Information (Details) $ in Millions	9 Months Ended
Mar. 31, 2022 USD ($)
Commitments and Contingencies Disclosure [Abstract]
Other facility and equipment expiration year	2031
Multiyear third party and financial institutions Agreements expiration year	2029
Authorized transactions but not cleared	$ 41.0

Multiyear third party and financial institutions agreements expiration year.

No definition available.

Name:	bill_MultiyearThirdPartyAndFinancialInstitutionsAgreementsExpirationYear
Namespace Prefix:	bill_
Data Type:	xbrli:gYearItemType
Balance Type:	na
Period Type:	duration