SPAC Sponsor, Affiliate, or Promoter [Axis] East Water Ave LLC [Member] Compensation Nature [Axis] Private Units [Member] NFR Capital Limited [Member] Sponsor [Member] Over-allotment Option [Axis] Over-allotment Option Exercised [Member] Security Class [Axis] Offering Price of 10.00 Per Unit [Member] Redemption Level [Axis] Redemption at 25 Percent of Maximum [Member] Redemption at 50 Percent of Maximum [Member] Redemption at 75 Percent of Maximum [Member] Redemption at 100 Percent of Maximum [Member] Over-allotment Option Not Exercised [Member] Difference between NTBV and Offering Price [Member] No Over-Allotment [Member] No Redemption [Member] Dilution Source [Axis] Net Proceeds From This Offering And The Sale Of Private Units [Member] Offering Costs Accrued For And Paid In Advance Excluded From Tangible Book Value [Member] Proceeds Subject To Redemption [Member] Common Shares Issued And Outstanding Prior To This Offering [Member] Common Shares Forfeited If Over-Allotment Is Not Exercised [Member] Common Shares Included In Units Offered [Member] Common Shares Included In Private Units [Member] Common Shares Included In Representative Shares [Member] Ordinary Shares Subject To Redemption [Member] Full Over-Allotment [Member] Common Shares [Member] Loan [Member] Working Capital Loan [Member] Molly Huang [Member] Founder Shares [Member] Thomas Kerkaert [Member] Irfan Verjee [Member] Masahiro Honna [Member] Samir Parikh [Member] Sponsor B [Member] Sponsor A [Member] Cover [Abstract] Amendment Flag Entity Central Index Key Document Type Entity Registrant Name Entity Incorporation, State or Country Code Entity Primary SIC Number Entity Tax Identification Number Entity Filer Category Entity Small Business Entity Emerging Growth Company Entity Ex Transition Period Amendment Description Fiduciary Duties to Other Companies, SPAC Officers and Directors [Table Text Block] SPAC, Actual or Potential Material Conflict of Interest, Prospectus Summary [Text Block] SPAC Sponsor, Nature of Reimbursement Offering Price of 10.00 Per Unit [Member] Difference between NTBV and Offering Price [Member] Blue Water Acquisition IV LLC [Member] Loan [Member] Private Placement Units [Member] Class B Ordinary Shares [Member] East Water Ave LLC [Member] Private Units [Member] Working Capital Loan [Member] NFR Capital Limited [Member] Molly Huang [Member] Thomas Kerkaert [Member] Irfan Verjee [Member] Masahiro Honna [Member] Samir Parikh [Member] Sponsor [Member] No Over-Allotment [Member] Full Over-Allotment [Member] Common Shares Included In Private Units [Member] Common Shares Included In Representative Shares [Member] Common Shares Included In Public Units Offered [Member] Common Shares Issued And Outstanding Prior To This Offering [Member] Common Shares Forfeited If Over-Allotment Is Not Exercised [Member] Common Shares Included In Units Offered [Member] Sponsor A [Member] Sponsor B [Member] SPAC Sponsor Form of Organization Price Paid or to be Paid for Securities, Total Amount Net Tangible Book Value Adjusted Number of Shares Used Adjustment SPAC Offering Forepart, Security Holders Have the Opportunity to Redeem Securities [Flag] SPAC Offering Forepart, Security Holder Redemptions Subject to Limitations [Flag] Securities Issued or to be Issued, Shares Price Paid or to be Paid for Securities, Per Share SPAC Offering Forepart, De-SPAC Consummation Timeframe Description [Text Block] SPAC Offering Forepart, Adjusted Net Tangible Book Value Per Share [Table Text Block] Net Tangible Book Value, Adjusted, per Share SPAC Offering Forepart, Actual or Material Conflict of Interest [Flag] De-SPAC Consummation Timeframe, Limitations on Extensions [Text Block] De-SPAC Consummation Timeframe, Extension Failure, Consequences to Sponsor [Text Block] SPAC Prospectus Summary, Sponsor Compensation [Table Text Block] SPAC, Compensation and Securities Issuance, Material Dilution, Likelihood [Text Block] SPAC Sponsor and Affiliates Information, Restrictions on Sale of SPAC Securities [Table Text Block] SPAC Sponsor, Description of Expiration Dates of Restrictions [Text Block] SPAC Sponsor, Persons and Entities Subject to Restrictions SPAC Sponsor, Description of Exceptions to Restrictions [Text Block] SPAC, Securities Offered, Material Terms [Text Block] SPAC Offering Forepart, De-SPAC Consummation Timeframe May be Extended [Flag] SPAC, Adjusted Net Tangible Book Value Per Share with Sources of Dilution [Table Text Block] Net Tangible Book Value, Pre-transaction, Per Share Net Tangible Book Value Amount of Dilution, Per Share Net Tangible Book Value SPAC Sponsor Name SPAC Offering Forepart, De-SPAC Consummation Timeframe SPAC Will Solicit Shareholder Approval for De-SPAC Transaction [Flag] De-SPAC Consummation Timeframe Extension, Security Holders Voting or Redemption Rights [Flag] SPAC, Trust or Escrow Account, Material Terms [Text Block] SPAC, Trust or Escrow Account, Gross Offering Proceeds Placed, Percent SPAC, Trust or Escrow Account, Gross Offering Proceeds Placed, Amount SPAC Additional Financing Plans, Impact on Security Holders [Text Block] SPAC Offering Forepart, Sponsor Compensation Material Dilution [Flag] Material Roles and Responsibilities [Text Block] SPAC Officers and Directors, Fiduciary Duties to Other Companies, Description [Text Block] SPAC Sponsor [Table Text Block] SPAC Sponsor, Controlling Persons [Table Text Block] SPAC, Securities Offered, Redemption Rights [Text Block]