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The Company and Its Significant Accounting Policies - Concentrations of Credit Risk (Details) - USD ($) $ in Millions | Dec. 31, 2025 | Jun. 30, 2025
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Accounting Policies [Abstract] |  |
Allowance for potential credit losses related to accounts receivable and acquired card receivables | $ 33.3 | $ 30.3

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- Definition Accounts receivable, allowance for potential credit loss and acquired card receivables. + References No definition available. + Details
Name: | bill_AccountsReceivableAllowanceForPotentialCreditLossAndAcquiredCardReceivables
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_AccountingPoliciesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration