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FAIR VALUE MEASUREMENTS, Initial Measurement (FY) (Details) - Initial Public Offering [Member] | Sep. 17, 2020 shares
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Public Warrants [Member] |
Initial Measurement [Abstract] |
Number of securities called by each unit (in shares) | 0.5
Class A Common Stock [Member] |
Initial Measurement [Abstract] |
Number of securities called by each unit (in shares) | 1

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

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- Definition The number of securities into which each unit may be converted. For example, but not limited to, each unit may be converted into two shares of common stock. + References No definition available. + Details
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Namespace Prefix: | sbg_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |