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Fair Value Measurements - Schedule of Fair Value of assets and liabilities on a Recurring Basis (Details)	Dec. 31, 2025 USD ($)
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

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

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- Details

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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: