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CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands | Dec. 31, 2025 | Sep. 30, 2025 | Jun. 30, 2025 | Dec. 31, 2024 | Sep. 30, 2024 | Jun. 30, 2024
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Statement of Financial Position [Abstract] |  |  |  |  |  |
Acquired card receivables, allowance for credit losses | $ 19,542 | $ 15,217 | $ 15,020 | $ 20,768 | $ 24,868 | $ 20,883

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- Definition Acquired card receivables allowance for credit losses. + References No definition available. + Details
Name: | bill_AcquiredCardReceivablesAllowanceForCreditLosses
Namespace Prefix: | bill_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_StatementOfFinancialPositionAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration