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Acquired Card Receivables - Additional Information (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Mar. 31, 2025 | Mar. 31, 2024 | Mar. 31, 2025 | Mar. 31, 2024
Acquired Card Receivables [Abstract] |  |  |  |
Acquired card receivable as collateral | $ 247.2 |  | $ 247.2 |
Authorized transactions but not cleared | 75.8 |  | $ 75.8 |
Grace period to payment on acquired card receivables |  |  | 5 days |
Release of provision for expected credit losses | 5.7 |  | $ 5.7 |
Card receivables acquired during the period | $ 5,300.0 | $ 4,300.0 | $ 15,700.0 | $ 12,600.0

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- 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

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- 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

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- 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

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- 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

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- 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

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- Definition Amount of expense (reversal of expense) for expected credit loss on accounts receivable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-13 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(5)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147483621/220-10-S99-2 + Details
Name: | us-gaap_ProvisionForDoubtfulAccounts
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration