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Finance Receivables, Net - Summary of Changes in Finance Receivables (Details) - USD ($) $ in Thousands | 3 Months Ended
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Jul. 31, 2025 | Jul. 31, 2024
Receivables [Abstract] |  |
Balance at beginning of period | $ 1,180,010 | $ 1,097,931
Finance receivable originations | 262,746 | 271,756
Finance receivable collections | (118,720) | (112,358)
Provision for credit losses | (103,036) | (95,423)
Losses on claims for accident protection plan | (8,595) | (9,321)
Inventory acquired in repossession and accident protection plan claims | (29,616) | (26,975)
Balance at end of period | $ 1,182,789 | $ 1,125,610

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- Definition Finance receivable collections + References No definition available. + Details
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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 220 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 22 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147476148/220-40-50-22 Reference 3: 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
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Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
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