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Commitments (FY) (Details) | 1 Months Ended
--- | ---
Dec. 31, 2020 USD ($) Demand $ / shares shares
Underwriting Agreement [Abstract] |
Underwriting discount (in dollars per share) | $ / shares | $ 0.20
Underwriting discount | $ | $ 5,000,000
Deferred underwriting fee (in dollars per share) | $ / shares | $ 0.35
Deferred underwriting fee | $ | $ 10,500,000
Maximum [Member] |
Registration Rights [Abstract] |
Number of demands entitled to holders | Demand | 3
Over-Allotment Option [Member] |
Underwriting Agreement [Abstract] |
Term of option for underwriters to purchase additional Units to cover over-allotments | 45 days
Underwriting discount (in dollars per share) | $ / shares | $ 0.20
Underwriting discount | $ | $ 5,750,000
Deferred underwriting fee (in dollars per share) | $ / shares | $ 0.35
Deferred underwriting fee | $ | $ 10,062,500
Over-Allotment Option [Member] | Maximum [Member] |
Underwriting Agreement [Abstract] |
Additional Units that can be purchased to cover over-allotments (in shares) | shares | 3,750,000

X
- Definition Number of additional Units that can be purchased by the underwriters to cover over-allotments. + References No definition available. + Details
Name: | wald_AdditionalUnitsThatCanBePurchasedToCoverOverAllotments
Namespace Prefix: | wald_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition Carrying value as of the balance sheet date of outstanding underwriting commissions payable initially due after one year or beyond the operating cycle if longer, excluding current portion. + References No definition available. + Details
Name: | wald_DeferredUnderwritingCommissions
Namespace Prefix: | wald_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Deferred underwriting commissions per unit payable to underwriters if the Company completes a Business Combination, subject to terms of the underwriting agreement. + References No definition available. + Details
Name: | wald_DeferredUnderwritingCommissionsPerUnit
Namespace Prefix: | wald_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the number of demands eligible security holder can make. + References No definition available. + Details
Name: | wald_NumberOfDemandsEligibleSecurityHolderCanMake
Namespace Prefix: | wald_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Period of time from the date of the final prospectus relating to the Initial Public Offering for underwriters to purchase additional Units to cover over-allotments, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents + References No definition available. + Details
Name: | wald_OptionForUnderwritersToPurchaseAdditionalUnitsTerm
Namespace Prefix: | wald_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | wald_RegistrationRightsAbstract
Namespace Prefix: | wald_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | wald_UnderwritingAgreementAbstract
Namespace Prefix: | wald_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Aggregate underwriting discount fee paid to the underwriters upon the closing of the Initial Public Offering. + References No definition available. + Details
Name: | wald_UnderwritingDiscount
Namespace Prefix: | wald_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Underwriting discount fee per unit paid to underwriters. + References No definition available. + Details
Name: | wald_UnderwritingDiscountFee
Namespace Prefix: | wald_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_SubsidiarySaleOfStockAxis=us-gaap_OverAllotmentOptionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |