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Commitments and Contingencies (Details) - USD ($) $ in Millions	1 Months Ended	9 Months Ended
	Feb. 28, 2025	Sep. 30, 2025
Long-term Commitment (Excluding Unconditional Purchase Obligation) [Abstract]
Lease release payment	$ 28.0
Loss on lease termination		$ 24.3
Security Incident, net pre-tax expense		2.8
Loss contingency accrual, period increase (decrease)		1.1
Loss contingency accrual		0.0
Third-party technology [Member]
Long-term Commitment (Excluding Unconditional Purchase Obligation) [Abstract]
Remaining aggregate minimum purchase commitment		157.8
Long-term Purchase Commitment [Line Items]
Remaining aggregate minimum purchase commitment		$ 157.8

X

- Definition

Lease release payment

+ References

No definition available.

+ Details

Name:	blkb_LeaseReleasePayment
Namespace Prefix:	blkb_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Minimum amount to be expended to satisfy the terms of long-term purchase arrangements in which the entity has agreed to expend funds to procure goods or services.

+ References

No definition available.

+ Details

Name:	blkb_LongtermPurchaseCommitmentRemainingMinimumAmountCommitted
Namespace Prefix:	blkb_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Security Incident, Net Pre-tax Expense

+ References

No definition available.

+ Details

Name:	blkb_SecurityIncidentNetPreTaxExpense
Namespace Prefix:	blkb_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Amount of gain (loss) on termination of lease before expiration of lease term.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 842
-SubTopic 20
-Name Accounting Standards Codification
-Section 40
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479092/842-20-40-1

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of loss contingency liability.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 450
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483076/450-20-50-1

Reference 2: http://www.xbrl.org/2003/role/recommendedDisclosureRef
-Topic 450
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 10
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483076/450-20-50-10

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Amount of increase (decrease) in loss contingency liability.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 450
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483076/450-20-50-1

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	duration

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: