XML 72 R62.htm IDEA: XBRL DOCUMENT
v3.23.1

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Schedule Ownership Interests (Details) - Holdco, LLC shares in Thousands | Jun. 30, 2022 shares
--- | ---
Class A units of S1 Holdco | Entity A |
Property, Plant and Equipment [Line Items] |
Shares/Units (in shares) | 90,587
Ownership % | 80.00%
Class B units of S1 Holdco | Entity B |
Property, Plant and Equipment [Line Items] |
Shares/Units (in shares) | 22,077
Ownership % | 20.00%

X
- Definition The equity interest of noncontrolling shareholders, partners or other equity holders in consolidated entity. + References No definition available. + Details
Name: | us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_PropertyPlantAndEquipmentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of shares issued which are neither cancelled nor held in the treasury. + References No definition available. + Details
Name: | us-gaap_SharesOutstanding
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | us-gaap_StatementClassOfStockAxis=us-gaap_CommonClassAMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_OwnershipAxis=sst_EntityAMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=sst_S1HoldcoLLCMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementClassOfStockAxis=us-gaap_CommonClassBMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_OwnershipAxis=sst_EntityBMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |