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Subsequent Events (Details) - USD ($) $ in Millions | Apr. 30, 2024 | Jan. 31, 2022 | Oct. 30, 2020
--- | --- | --- | ---
Subsequent Event [Line Items] |  |  |
Credit facility, maximum borrowing capacity |  | $ 1,100.0 | $ 900.0
Subsequent event [Member] |  |  |
Subsequent Event [Line Items] |  |  |
Credit facility, maximum borrowing capacity | $ 1,500.0 |  |
Line of credit facility, available increase capacity, amount | $ 360.0 |  |
Line of credit facility, available increase capacity, percent of EBITDA | 100.00% |  |
Subsequent event [Member] | Fed funds effective rate overnight index swap rate [Member] |  |  |
Subsequent Event [Line Items] |  |  |
Line of credit facility variable interest rate | 0.50% |  |
Subsequent event [Member] | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] |  |  |
Subsequent Event [Line Items] |  |  |
Line of credit facility variable interest rate | 1.00% |  |
Subsequent event [Member] | Maximum [Member] |  |  |
Subsequent Event [Line Items] |  |  |
Line of credit facility, unused capacity, commitment fee percentage | 0.50% |  |
Net leverage ratio | 3.50 |  |
Subsequent event [Member] | Maximum [Member] | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] |  |  |
Subsequent Event [Line Items] |  |  |
Debt instrument, basis spread on variable rate | 2.50% |  |
Subsequent event [Member] | Maximum [Member] | Base rate [Member] |  |  |
Subsequent Event [Line Items] |  |  |
Debt instrument, basis spread on variable rate | 1.50% |  |
Subsequent event [Member] | Maximum [Member] | Designated Currency Rate [Member] |  |  |
Subsequent Event [Line Items] |  |  |
Debt instrument, basis spread on variable rate | 2.50% |  |
Subsequent event [Member] | Minimum [Member] |  |  |
Subsequent Event [Line Items] |  |  |
Line of credit facility, unused capacity, commitment fee percentage | 0.25% |  |
Subsequent event [Member] | Minimum [Member] | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] |  |  |
Subsequent Event [Line Items] |  |  |
Debt instrument, basis spread on variable rate | 1.375% |  |
Subsequent event [Member] | Minimum [Member] | Base rate [Member] |  |  |
Subsequent Event [Line Items] |  |  |
Debt instrument, basis spread on variable rate | 0.375% |  |
Subsequent event [Member] | Minimum [Member] | Designated Currency Rate [Member] |  |  |
Subsequent Event [Line Items] |  |  |
Debt instrument, basis spread on variable rate | 1.375% |  |
Subsequent event [Member] | Revolving credit loans [Member] |  |  |
Subsequent Event [Line Items] |  |  |
Credit facility, maximum borrowing capacity | $ 700.0 |  |
Subsequent event [Member] | Term loans [Member] |  |  |
Subsequent Event [Line Items] |  |  |
Credit facility, maximum borrowing capacity | 800.0 |  |
Subsequent event [Member] | Standby letters of credit [Member] |  |  |
Subsequent Event [Line Items] |  |  |
Credit facility, maximum borrowing capacity | 50.0 |  |
Subsequent event [Member] | Swingline loans |  |  |
Subsequent Event [Line Items] |  |  |
Credit facility, maximum borrowing capacity | 50.0 |  |
Subsequent event [Member] | Foreign line of credit [Member] |  |  |
Subsequent Event [Line Items] |  |  |
Credit facility, maximum borrowing capacity | $ 150.0 |  |

X
- Definition Maximum allowable increase based on percentage of EBITDA provided in credit facility to increase revolving credit commitments and/or request additional term loans. + References No definition available. + Details
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Namespace Prefix: | blkb_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Line Of Credit Facility Variable Interest Rate + References No definition available. + Details
Name: | blkb_LineOfCreditFacilityVariableInterestRate
Namespace Prefix: | blkb_
Data Type: | dtr-types1:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Maximum allowable increase amount provided in credit facility to increase revolving credit commitments and/or request additional term loans. + References No definition available. + Details
Name: | blkb_LineofCreditFacilityAvailableIncreaseCapacityAmount
Namespace Prefix: | blkb_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Net Leverage Ratio + References No definition available. + Details
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Namespace Prefix: | blkb_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | instant

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- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 830 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481674/830-30-50-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 855 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org//1943274/2147483399/855-10-50-2 + Details
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Period Type: | duration

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
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- Details
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Namespace Prefix: |
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- Details
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |