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Finance Receivables, Net - Changes in Finance Receivables (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
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Jan. 31, 2025 | Jan. 31, 2024 | Jan. 31, 2025 | Jan. 31, 2024
Receivables [Abstract] |  |  |  |
Balance at beginning of period |  |  | $ 1,097,931 | $ 1,062,760
Finance receivable originations |  |  | 779,013 | 794,477
Finance receivable collections |  |  | (338,736) | (324,703)
Provision for credit losses | $ (86,652) | $ (89,582) | (281,597) | (321,300)
Losses on claims for accident protection plan |  |  | (25,013) | (24,480)
Inventory acquired in repossession and accident protection plan claims |  |  | (86,031) | (101,643)
Balance at end of period | $ 1,145,567 | $ 1,085,111 | $ 1,145,567 | $ 1,085,111

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- Definition Finance receivable collections + References No definition available. + Details
Name: | crmt_FinanceReceivableCollections
Namespace Prefix: | crmt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Represents finance receivable origination. + References No definition available. + Details
Name: | crmt_FinanceReceivableOriginations
Namespace Prefix: | crmt_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Amortized cost, after allowance for credit loss, before loan origination cost, of financing receivable. Excludes financing receivable covered under loss sharing agreement and net investment in lease. + References No definition available. + Details
Name: | crmt_FinancingReceivableAfterAllowanceForCreditLossBeforeLoanCosts
Namespace Prefix: | crmt_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Inventory acquired in repossession and payment protection plan claims + References No definition available. + Details
Name: | crmt_InventoryAcquiredInRepossessionAndPaymentProtectionPlanClaims
Namespace Prefix: | crmt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Losses on claims for payment protection plan + References No definition available. + Details
Name: | crmt_LossesOnClaimsForPaymentProtectionPlan
Namespace Prefix: | crmt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Amount of credit loss expense (reversal of expense) for financing receivable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-13 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 942 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(11)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478524/942-220-S99-1 + Details
Name: | us-gaap_ProvisionForLoanLossesExpensed
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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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