Acquired Card Receivables - Summary of Fair Value of Consideration Received from Transfer of Card Receivables (Details) - USD ($) $ in Thousands	3 Months Ended
Sep. 30, 2022	Sep. 30, 2021
Acquired Card Receivables [Abstract]
Cash	$ 316,477	$ 258,501
Beneficial interest derivative	1,682	1,194
Total	$ 318,159	$ 259,695

Initial fair value of consideration received beneficial interest derivative.

No definition available.

Name:	bill_InitialFairValueOfConsiderationReceivedBeneficialInterestDerivative
Namespace Prefix:	bill_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration