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Acquired Card Receivables - Additional Information (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2025 | Dec. 31, 2024
Acquired Card Receivables [Abstract] |  |  |  |
Acquired card receivable as collateral | $ 437.2 |  | $ 437.2 |
Authorized transactions but not cleared | 41.9 |  | $ 41.9 |
Grace period to payment on acquired card receivables |  |  | 5 days |
Card receivables acquired during the period | $ 6,600.0 | $ 5,300.0 | $ 12,800.0 | $ 10,500.0

X
- Definition Acquired card receivable as collateral. + References No definition available. + Details
Name: | bill_AcquiredCardReceivableAsCollateral
Namespace Prefix: | bill_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Acquired card receivables. + References No definition available. + Details
Name: | bill_AcquiredCardReceivablesAbstract
Namespace Prefix: | bill_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Authorized transactions but not cleared. + References No definition available. + Details
Name: | bill_AuthorizedTransactionsButNotCleared
Namespace Prefix: | bill_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Card Receivables Acquired During The Period + References No definition available. + Details
Name: | bill_CardReceivablesAcquiredDuringThePeriod
Namespace Prefix: | bill_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Grace period to payment on acquired card receivables. + References No definition available. + Details
Name: | bill_GracePeriodToPaymentOnAcquiredCardReceivables
Namespace Prefix: | bill_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration