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Defined Contribution Plan (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Defined Contribution Plan Disclosure [Line Items]
Employer matching contribution, percent of qualified employees' contribution	50.00%	50.00%	50.00%
Employer matching contributions, total	$ 7.8	$ 9.3	$ 6.5
Employer discretionary contributions, total	$ 0.0	$ 0.0	$ 0.0
Minimum [Member]
Defined Contribution Plan Disclosure [Line Items]
Employee contribution, percent of salary	1.00%	1.00%	1.00%
Maximum [Member]
Defined Contribution Plan Disclosure [Line Items]
Employee contribution, percent of salary	75.00%	75.00%	75.00%
Employer matching contribution, percent of employees' salary	6.00%	6.00%	6.00%

X

- Definition

Percentage of salary contribution by employees.

+ References

No definition available.

+ Details

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Namespace Prefix:	blkb_
Data Type:	dtr-types1:percentItemType
Balance Type:	na
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X

- Definition

Amount of cost for defined contribution plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 70
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480794/715-70-50-1

+ Details

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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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 70
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480794/715-70-50-1

+ Details

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X

- Definition

Amount of discretionary contributions made by an employer to a defined contribution plan.

+ References

No definition available.

+ Details

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X

- Definition

Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan.

+ References

No definition available.

+ Details

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X

- Definition

Percentage employer matches of the employee's percentage contribution matched.

+ References

No definition available.

+ Details

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