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Fair Value Measurements - Schedule of Fair Value of assets and liabilities on a Recurring Basis (Details) | Dec. 31, 2025 USD ($)
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Assets: |
Cash held in Trust Account | $ 258,796,563
Recurring | Level 1 |
Assets: |
Cash held in Trust Account | $ 258,796,563

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- Definition Represents the fair value of cash and investments in marketable securities maintained in a trust account, typically restricted for a specific purpose, and measured on a recurring basis using fair value inputs. + References No definition available. + Details
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Namespace Prefix: | BLUW_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_AssetsFairValueDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_FairValueByMeasurementFrequencyAxis=us-gaap_FairValueMeasurementsRecurringMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel1Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |