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Notes Receivable and Allowance for Credit Losses - Narrative (Details) | 3 Months Ended
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Mar. 31, 2024 installment product
Receivables [Abstract] |
Number of installments | installment | 4
Installment period (in days) | 14 days
Receivables generally due (in days) | 42 days
Number of product segments | product | 1
Weighted average days outstanding of notes receivable (in days) | 34 days

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- Definition Consumer Installment Payment Plans, Number Of Installments + References No definition available. + Details
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Namespace Prefix: | szl_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition Financing Receivable, Excluding Accrued Interest, Weighted Average Days Outstanding + References No definition available. + Details
Name: | szl_FinancingReceivableExcludingAccruedInterestWeightedAverageDaysOutstanding
Namespace Prefix: | szl_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Financing Receivable, Installment Payment Plan, Installment Period + References No definition available. + Details
Name: | szl_FinancingReceivableInstallmentPaymentPlanInstallmentPeriod
Namespace Prefix: | szl_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Financing Receivables, Receivables Due , Duration + References No definition available. + Details
Name: | szl_FinancingReceivablesReceivablesDueDuration
Namespace Prefix: | szl_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Number of Product Segments + References No definition available. + Details
Name: | szl_NumberOfProductSegments
Namespace Prefix: | szl_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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