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Note F - Debt Facilities (Details Textual) - USD ($)		3 Months Ended		12 Months Ended
	Oct. 29, 2020	Jul. 31, 2021	Jul. 31, 2020	Apr. 30, 2021	Feb. 10, 2021	Jan. 31, 2021	Dec. 31, 2020	Sep. 30, 2019	Sep. 29, 2019
Amortization of Debt Issuance Costs and Discounts, Total		$ 120,000	$ 80,000
Payments of Financing Costs, Total		0	$ 0
Debt Issuance Costs, Gross		$ 558,000		$ 678,000
Minimum [Member]
Financing Receivable Payment Period (Month)		18 months
Minimum [Member] | Medium-term Vehicle Contracts [Member]
Financing Receivable Payment Period (Month)	36 months
Minimum [Member] | Long-term Vehicle Contracts [Member]
Financing Receivable Payment Period (Month)	42 months
Maximum [Member]
Financing Receivable Payment Period (Month)		54 months
Maximum [Member] | Medium-term Vehicle Contracts [Member]
Financing Receivable Payment Period (Month)	42 months
Maximum [Member] | Long-term Vehicle Contracts [Member]
Financing Receivable Payment Period (Month)	60 months
BMO Harris Bank [Member] | Line of Credit [Member]
Line of Credit Facility, Maximum Borrowing Capacity							$ 326,000,000
Debt Instrument, Covenant, Maximum Borrowing Base, Percentage of Financing Receivables	15.00%
Debt Instrument, Covenant, Maximum Aggregate Consideration for Businesses Acquired in One Year	$ 20,000,000.0
Debt Instrument, Covenant, Maximum Disposal of Real Estate	5,000,000.0
Debt Instrument, Covenant, Maximum Disposal Other Properties	$ 1,000,000.0
Line of Credit Facility, Total Increase in Borrowing Capacity							$ 85,000,000
Maximum Allowable Capital Expenditures By Credit Facilities Amendment					$ 25,000,000	$ 10,000,000
BMO Harris Bank [Member] | Medium-term Vehicle Contracts [Member] | Line of Credit [Member]
Debt Instrument, Covenant, Maximum Borrowing Base, Percentage of Financing Receivables	15.00%
BMO Harris Bank [Member] | Long-term Vehicle Contracts [Member] | Line of Credit [Member]
Debt Instrument, Covenant, Maximum Borrowing Base, Percentage of Financing Receivables	5.00%
Revolving Credit Facility [Member]
Line of Credit Facility, Additional Borrowing Capacity, Accordion Feature		$ 53,400,000
Revolving Credit Facility [Member] | BMO Harris Bank [Member]
Line of Credit Facility, Maximum Borrowing Capacity								$ 241,000,000	$ 215,000,000
Line of Credit Facility, Additional Borrowing Capacity, Accordion Feature								100,000,000	50,000,000
Debt Instrument, Interest Rate, Effective Percentage		2.85%		2.85%
Revolving Credit Facility [Member] | BMO Harris Bank [Member] | London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument, Basis Spread on Variable Rate		2.35%		2.35%
Colonial Revolving Credit Facility [Member] | BMO Harris Bank [Member]
Line of Credit Facility, Maximum Borrowing Capacity								231,000,000	$ 205,000,000
ACM TCM Revolving Credit Facility [Member] | BMO Harris Bank [Member]
Line of Credit Facility, Maximum Borrowing Capacity								$ 10,000,000

X

- Definition

The maximum aggregate consideration for all businesses acquired in one year allowed under the covenant of the debt instrument.

+ References

No definition available.

+ Details

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Balance Type:	credit
Period Type:	instant

X

- Definition

The maximum borrowing base allowed expressed as a percentage of financing receivables balance under the covenant of the debt instrument.

+ References

No definition available.

+ Details

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X

- Definition

The maximum amount of real estate that is allowed to be disposed of under the covenant of the debt instrument.

+ References

No definition available.

+ Details

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Namespace Prefix:	crmt_
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X

- Definition

The maximum amount of other properties that can be disposed of under the covenant of the debt instrument.

+ References

No definition available.

+ Details

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Namespace Prefix:	crmt_
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X

- Definition

Represents the payment period on installment sale contracts from the sale of used vehicles.

+ References

No definition available.

+ Details

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Namespace Prefix:	crmt_
Data Type:	xbrli:durationItemType
Balance Type:	na
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X

- Definition

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

+ References

No definition available.

+ Details

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

X

- Definition

Amount of increase under the credit facility.

+ References

No definition available.

+ Details

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Namespace Prefix:	crmt_
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Period Type:	instant

X

- Definition

Amount of capital expenditures allowable under Credit Facilities in the aggregate during any fiscal year.

+ References

No definition available.

+ Details

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Namespace Prefix:	crmt_
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X

- Definition

Amount of amortization expense attributable to debt discount (premium) and debt issuance costs.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
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-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 55
-Paragraph 69E
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=124435984&loc=d3e28555-108399

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
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+ Details

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Balance Type:	debit
Period Type:	duration

X

- Definition

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

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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X

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 6
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=123466204&loc=SL6036836-161870

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-URI http://asc.fasb.org/extlink&oid=124435984&loc=d3e28551-108399

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-Topic 835
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-URI http://asc.fasb.org/extlink&oid=124429444&loc=SL124452920-239629

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

+ Details

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Balance Type:	na
Period Type:	instant

X

- Definition

Amount, before accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=124435984&loc=d3e28555-108399

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- 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
-Publisher FASB
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-Topic 210
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-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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

X

- Definition

The cash outflow for loan and debt issuance costs.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
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-Paragraph 15
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Namespace Prefix:	us-gaap_
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X

- Details

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- Details

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- Details

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Period Type:

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- Details

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- Details

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- Details

Name:	us-gaap_VariableRateAxis=us-gaap_LondonInterbankOfferedRateLIBORMember
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- Details

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