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RELATED PARTY TRANSACTIONS, Founder Shares (Q1) (Details) - USD ($) |  | 1 Months Ended | 3 Months Ended | 6 Months Ended
--- | --- | --- | --- | ---
Jul. 03, 2020 | Oct. 31, 2020 | Aug. 31, 2020 | Mar. 31, 2021 | Dec. 31, 2020
Founder Shares [Abstract] |  |  |  |  |
Proceeds from issuance of Class B common stock to Sponsor |  |  |  |  | $ 25,000
Class A Common Stock [Member] | Private Placement Warrant [Member] | Maximum [Member] |  |  |  |  |
Founder Shares [Abstract] |  |  |  |  |
Share price (in dollars per share) |  |  |  | $ 18.00 | $ 18.00
Sponsor [Member] | Closing Price of Common Stock Equals or Exceeds $12.50 per share [Member] | Minimum [Member] |  |  |  |  |
Founder Shares [Abstract] |  |  |  |  |
Threshold period after initial Business Combination |  |  |  | 240 days |
Sponsor [Member] | Closing Price of Common Stock Equals or Exceeds $15.00 per share [Member] | Minimum [Member] |  |  |  |  |
Founder Shares [Abstract] |  |  |  |  |
Threshold period after initial Business Combination |  |  |  | 240 days |
Sponsor [Member] | Private Placement Warrant [Member] | Closing Price of Common Stock Equals or Exceeds $12.50 per share [Member] |  |  |  |  |
Founder Shares [Abstract] |  |  |  |  |
Number of shares called by each share (in shares) |  |  |  | 0.33 |
Sponsor [Member] | Private Placement Warrant [Member] | Closing Price of Common Stock Equals or Exceeds $15.00 per share [Member] |  |  |  |  |
Founder Shares [Abstract] |  |  |  |  |
Number of shares called by each share (in shares) |  |  |  | 0.33 |
Sponsor [Member] | Class B Common Stock [Member] |  |  |  |  |
Founder Shares [Abstract] |  |  |  |  |
Holding period for transfer of Founder Shares or Private Placement Warrants |  |  |  | 18 months |
Founder Shares [Member] | Sponsor [Member] | Closing Price of Common Stock Equals or Exceeds $12.50 per share [Member] |  |  |  |  |
Founder Shares [Abstract] |  |  |  |  |
Number of shares called by each share (in shares) |  |  |  | 0.33 |
Founder Shares [Member] | Sponsor [Member] | Closing Price of Common Stock Equals or Exceeds $15.00 per share [Member] |  |  |  |  |
Founder Shares [Abstract] |  |  |  |  |
Number of shares called by each share (in shares) |  |  |  | 0.33 |
Founder Shares [Member] | Sponsor [Member] | Private Placement Warrant [Member] | Closing Price of Common Stock Equals or Exceeds $12.50 per share [Member] |  |  |  |  |
Founder Shares [Abstract] |  |  |  |  |
Number of trading days |  |  |  | 20 days |
Trading day threshold period |  |  |  | 30 days |
Founder Shares [Member] | Sponsor [Member] | Private Placement Warrant [Member] | Closing Price of Common Stock Equals or Exceeds $12.50 per share [Member] | Minimum [Member] |  |  |  |  |
Founder Shares [Abstract] |  |  |  |  |
Share price (in dollars per share) |  |  |  | $ 12.50 |
Founder Shares [Member] | Sponsor [Member] | Private Placement Warrant [Member] | Closing Price of Common Stock Equals or Exceeds $15.00 per share [Member] |  |  |  |  |
Founder Shares [Abstract] |  |  |  |  |
Number of trading days |  |  |  | 20 days |
Trading day threshold period |  |  |  | 30 days |
Founder Shares [Member] | Sponsor [Member] | Private Placement Warrant [Member] | Closing Price of Common Stock Equals or Exceeds $15.00 per share [Member] | Minimum [Member] |  |  |  |  |
Founder Shares [Abstract] |  |  |  |  |
Share price (in dollars per share) |  |  |  | $ 15.00 |
Founder Shares [Member] | Sponsor [Member] | Class A Common Stock [Member] |  |  |  |  |
Founder Shares [Abstract] |  |  |  |  |
Number of trading days |  |  |  |  | 20 days
Trading day threshold period |  |  |  |  | 30 days
Founder Shares [Member] | Sponsor [Member] | Class A Common Stock [Member] | Minimum [Member] |  |  |  |  |
Founder Shares [Abstract] |  |  |  |  |
Share price (in dollars per share) |  |  |  |  | $ 12.00
Threshold period after initial Business Combination |  |  |  |  | 150 days
Founder Shares [Member] | Sponsor [Member] | Class B Common Stock [Member] |  |  |  |  |
Founder Shares [Abstract] |  |  |  |  |
Shares issued (in shares) | 5,750,000 |  |  |  |
Proceeds from issuance of Class B common stock to Sponsor | $ 25,000 |  |  |  |
Ownership interest, as converted percentage |  |  |  | 20.00% | 20.00%
Number of shares no longer subject to forfeiture (in shares) |  |  |  | 750,000 | 750,000
Founder Shares [Member] | Sponsor [Member] | Class B Common Stock [Member] | Maximum [Member] |  |  |  |  |
Founder Shares [Abstract] |  |  |  |  |
Number of shares subject to forfeiture (in shares) |  |  | 750,000 |  |
Founder Shares [Member] | Mr. De Sole [Member] | Class B Common Stock [Member] |  |  |  |  |
Founder Shares [Abstract] |  |  |  |  |
Shares issued (in shares) |  |  | 40,000 |  |
Founder Shares [Member] | Mr. Toubassy [Member] | Class B Common Stock [Member] |  |  |  |  |
Founder Shares [Abstract] |  |  |  |  |
Shares issued (in shares) |  |  | 25,000 |  |
Founder Shares [Member] | Mr. Hilfiger [Member] | Class B Common Stock [Member] |  |  |  |  |
Founder Shares [Abstract] |  |  |  |  |
Shares issued (in shares) |  |  | 30,000 |  |
Founder Shares [Member] | Mr. Goss [Member] | Class B Common Stock [Member] |  |  |  |  |
Founder Shares [Abstract] |  |  |  |  |
Shares issued (in shares) |  | 40,000 |  |  |

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