Commitments and Contingencies - Additional Information (Details)	9 Months Ended
Mar. 31, 2021
Commitments And Contingencies Disclosure [Abstract]
Multi-year agreements expiration year	2025
Strategic partnership agreement period	10 years
Online bill payment products expiration month and year	2027-06

Online bill payment products expiration month and year.

No definition available.

Name:	bill_OnlineBillPaymentProductsExpirationMonthAndYear
Namespace Prefix:	bill_
Data Type:	xbrli:gYearMonthItemType
Balance Type:	na
Period Type:	duration