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Restatement of Previously Issued Financial Statements - Schedule of impact on balance sheet and income statement (Q3) (Details) - USD ($) |  |  | 1 Months Ended | 3 Months Ended | 6 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | --- | --- | ---
Jun. 30, 2021 | Mar. 31, 2021 | Dec. 31, 2020 | Sep. 30, 2021 | Jun. 30, 2021 | Mar. 31, 2021 | Jun. 30, 2021 | Sep. 30, 2021 | Dec. 07, 2020
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |
Additional Paid-in Capital |  |  | $ 0 |  |  |  |  |  |
Accumulated Deficit |  |  | (10,951) | (35,360,269) |  |  |  | (35,360,269) |
Total Shareholder'' Equity (Deficit) | $ (43,116,815) | $ (41,565,306) | (10,951) | (35,359,406) | $ (43,116,815) | $ (41,565,306) | $ (43,116,815) | (35,359,406) | $ 0
Income Statement as of March 31, 2021 |  |  |  |  |  |  |  |  |
Net loss |  |  | $ (10,951) | $ 7,757,409 |  |  |  | $ 5,021,944 |
As Previously Reported [Member] |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |
Class A ordinary shares subject to possible redemption | 296,883,180 | 298,434,690 |  |  | 296,883,180 | 298,434,690 | 296,883,180 |  |
Class A ordinary shares, $0.0001 par value | $ 482 | $ 466 |  |  | $ 482 | $ 466 | $ 482 |  |
Class B ordinary shares, $0.0001 par value (in Shares) | 863 | 863 |  |  | 863 | 863 | 863 |  |
Additional Paid-in Capital | $ 7,745,077 | $ 6,193,583 |  |  | $ 7,745,077 | $ 6,193,583 | $ 7,745,077 |  |
Accumulated Deficit | (2,746,416) | (1,194,908) |  |  | (2,746,416) | (1,194,908) | (2,746,416) |  |
Total Shareholder'' Equity (Deficit) | $ 5,000,006 | $ 5,000,004 |  |  | 5,000,006 | 5,000,004 | 5,000,006 |  |
Number of shares subject to redemption (in Shares) | 29,688,318 | 29,843,469 |  |  |  |  |  |  |
Income Statement as of March 31, 2021 |  |  |  |  |  |  |  |  |
Net loss |  |  |  |  | $ (1,551,508) | $ (1,183,957) | $ (2,735,465) |  |
Weighted average Redeemable Class A ordinary shares (in Shares) |  |  |  |  | 29,483,469 | 29,885,095 | 29,849,073 |  |
Basic and diluted net loss per share, redeemable Class A ordinary shares (in Dollars per share) |  |  |  |  | $ 0.00 | $ 0.00 | $ 0.00 |  |
Weighted average non-redeemable Class B ordinary shares (in Shares) |  |  |  |  | 13,281,531 | 9,342,874 | 11,322,835 |  |
Basic and diluted net loss per share, non-redeemable Class B ordinary shares (in Dollars per share) |  |  |  |  | $ (0.12) | $ (0.13) | $ (0.24) |  |
Adjustment [Member] |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |
Class A ordinary shares subject to possible redemption | $ 48,116,820 | $ 46,565,310 |  |  | $ 48,116,820 | $ 46,565,310 | $ 48,116,820 |  |
Class A ordinary shares, $0.0001 par value | $ (482) | $ (466) |  |  | $ (482) | $ (466) | $ (482) |  |
Class B ordinary shares, $0.0001 par value (in Shares) |  |  |  |  |  |  |  |  |
Additional Paid-in Capital | $ (7,745,077) | $ (6,193,583) |  |  | $ (7,745,077) | $ (6,193,583) | $ (7,745,077) |  |
Accumulated Deficit | (40,371,262) | (40,371,261) |  |  | (40,371,262) | (40,371,261) | (40,371,262) |  |
Total Shareholder'' Equity (Deficit) | $ (48,116,821) | $ (46,565,310) |  |  | (48,116,821) | (46,565,310) | (48,116,821) |  |
Number of shares subject to redemption (in Shares) | 4,811,682 | 4,656,531 |  |  |  |  |  |  |
Income Statement as of March 31, 2021 |  |  |  |  |  |  |  |  |
Net loss |  |  |  |  |  |  |  |  |
Weighted average Redeemable Class A ordinary shares (in Shares) |  |  |  |  | 4,656,531 | (24,845,769) | (9,915,740) |  |
Basic and diluted net loss per share, redeemable Class A ordinary shares (in Dollars per share) |  |  |  |  | $ (0.04) | $ (0.10) | $ (0.10) |  |
Weighted average non-redeemable Class B ordinary shares (in Shares) |  |  |  |  | (4,656,531) | (2,703,829) | (3,679,779) |  |
Basic and diluted net loss per share, non-redeemable Class B ordinary shares (in Dollars per share) |  |  |  |  | $ 0.08 | $ 0.03 | $ 0.14 |  |
As Restated [Member] |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |
Class A ordinary shares subject to possible redemption | $ 345,000,000 | $ 345,000,000 |  |  | $ 345,000,000 | $ 345,000,000 | $ 345,000,000 |  |
Class A ordinary shares, $0.0001 par value |  |  |  |  |  |  |  |  |
Class B ordinary shares, $0.0001 par value (in Shares) | 863 | 863 |  |  | 863 | 863 | 863 |  |
Additional Paid-in Capital |  |  |  |  |  |  |  |  |
Accumulated Deficit | (43,117,678) | (41,566,169) |  |  | (43,117,678) | (41,566,169) | (43,117,678) |  |
Total Shareholder'' Equity (Deficit) | $ (43,116,815) | $ (41,565,306) |  |  | (43,116,815) | (41,565,306) | (43,116,815) |  |
Number of shares subject to redemption (in Shares) | 34,500,000 | 34,500,000 |  |  |  |  |  |  |
Income Statement as of March 31, 2021 |  |  |  |  |  |  |  |  |
Net loss |  |  |  |  | $ (1,551,508) | $ (1,183,957) | $ (2,735,465) |  |
Weighted average Redeemable Class A ordinary shares (in Shares) |  |  |  |  | 34,500,000 | 5,039,326 | 19,933,333 |  |
Basic and diluted net loss per share, redeemable Class A ordinary shares (in Dollars per share) |  |  |  |  | $ (0.04) | $ (0.10) | $ (0.10) |  |
Weighted average non-redeemable Class B ordinary shares (in Shares) |  |  |  |  | 8,625,000 | 6,639,045 | 7,643,056 |  |
Basic and diluted net loss per share, non-redeemable Class B ordinary shares (in Dollars per share) |  |  |  |  | $ (0.04) | $ (0.10) | $ (0.10) |  |

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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- References No definition available. + Details
Name: | wald_OrdinarySharesValue
Namespace Prefix: | wald_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The weighted average nonredeemable class B ordinary shares in shares. + References No definition available. + Details
Name: | wald_WeightedAverageNonredeemableClassBOrdinarySharesinShares
Namespace Prefix: | wald_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition The weighted average redeemable class A ordinary shares in shares. + References No definition available. + Details
Name: | wald_WeightedAverageRedeemableClassAOrdinarySharesinShares
Namespace Prefix: | wald_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | srt_RestatementAxis=srt_ScenarioPreviouslyReportedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RestatementAxis=srt_RevisionOfPriorPeriodAccountingStandardsUpdateAdjustmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RestatementAxis=srt_RestatementAdjustmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |