Additional borrowing capacity of line of credit facility with an accordion feature.

No definition available.

Name:	crmt_LineOfCreditFacilityAdditionalBorrowingCapacityAccordionFeature
Namespace Prefix:	crmt_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Minimum percent of pool balance.

+ References

No definition available.

+ Details

Name:	crmt_MinimumPercentOfPoolBalance
Namespace Prefix:	crmt_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Percentage of weighted average fixed coupon rate of notes payable issued.

+ References

No definition available.

+ Details

Name:	crmt_WeightedAverageFixedCouponRatePercent
Namespace Prefix:	crmt_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 835
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482900/835-30-50-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
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-Name Accounting Standards Codification
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-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481139/470-20-50-1B

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-Topic 470
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Reference 4: http://www.xbrl.org/2003/role/exampleRef
-Topic 470
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Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 835
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-URI https://asc.fasb.org//1943274/2147482925/835-30-45-2

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-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482949/835-30-55-8

+ Details

Name:	us-gaap_DebtInstrumentFaceAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

+ References

+ Details

Name:	us-gaap_DebtInstrumentInterestRateEffectivePercentage
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1

+ Details

Name:	us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Details

Name:	us-gaap_LongtermDebtTypeAxis=crmt_NonRecourseNotesPayable2022IssuanceMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=crmt_NonRecourseNotesPayable2023IssuanceMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=crmt_NonRecourseNotesPayable20232IssuanceMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=crmt_NotesPayableMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=us-gaap_RevolvingCreditFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LineOfCreditFacilityAxis=crmt_BmoHarrisBankMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=us-gaap_SecuredOvernightFinancingRateSofrOvernightIndexSwapRateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Note F - Debt Facilities (Details Textual) - USD ($) $ in Millions	6 Months Ended
	Oct. 31, 2023	Apr. 30, 2023	Sep. 29, 2019
Non Recourse Notes Payable, 2022 Issuance [Member]
Debt Instrument, Face Amount	$ 400.0
Weighted Average Fixed Coupon Rate, Percent	5.14%
Non Recourse Notes Payable, 2023 Issuance [Member]
Debt Instrument, Face Amount	$ 400.2
Weighted Average Fixed Coupon Rate, Percent	8.68%
Non Recourse Notes Payable, 2023-2 Issuance [Member]
Debt Instrument, Face Amount	$ 360.3
Weighted Average Fixed Coupon Rate, Percent	8.80%
Notes Payable [Member]
Minimum Percent of Pool Balance	2.00%
Revolving Credit Facility [Member] \| BMO Harris Bank [Member]
Line of Credit Facility, Maximum Borrowing Capacity			$ 600.0
Debt Instrument, Interest Rate, Effective Percentage	8.50%	8.25%
Line of Credit Facility, Additional Borrowing Capacity, Accordion Feature	$ 86.3
Revolving Credit Facility [Member] \| BMO Harris Bank [Member] \| Minimum [Member]
Debt Instrument, Interest Rate, Effective Percentage	2.25%
Revolving Credit Facility [Member] \| BMO Harris Bank [Member] \| Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]
Debt Instrument, Basis Spread on Variable Rate	2.75%