Represents the contract term of contracts included by Credit Facilities Amendment.

No definition available.

Name:	crmt_ContractTermOfContractsIncludedByCreditFacilitiesAmendment
Namespace Prefix:	crmt_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

No authoritative reference available.

+ References

No definition available.

+ Details

Name:	crmt_DividendRestrictionsMaximumAggregateAmountOfStockRepurchases
Namespace Prefix:	crmt_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

No authoritative reference available.

+ References

No definition available.

+ Details

Name:	crmt_DividendRestrictionsPercentageOfSumOfBorrowingBases
Namespace Prefix:	crmt_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the additional borrowing capacity of a line of credit facility.

+ References

No definition available.

+ Details

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

- Definition

Represents decrease in pricing tiers percentage.

+ References

No definition available.

+ Details

Name:	crmt_LineOfCreditFacilityDecreaseInPricingTiersPercent
Namespace Prefix:	crmt_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the distribution limitations, minimum percentage of aggregate funds available.

+ References

No definition available.

+ Details

Name:	crmt_LineOfCreditFacilityDistributionLimitationsMinimumPercentageOfAggregateFundsAvailable
Namespace Prefix:	crmt_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the distribution limitations, percentage of consolidated net income.

+ References

No definition available.

+ Details

Name:	crmt_LineOfCreditFacilityDistributionLimitationsPercentageOfConsolidatedNetIncome
Namespace Prefix:	crmt_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the distribution limitations, percentage of sum of borrowing bases.

+ References

No definition available.

+ Details

Name:	crmt_LineOfCreditFacilityDistributionLimitationsPercentageOfSumOfBorrowingBases
Namespace Prefix:	crmt_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents increase in pricing tiers percentage.

+ References

No definition available.

+ Details

Name:	crmt_LineOfCreditFacilityIncreaseInPricingTiersPercent
Namespace Prefix:	crmt_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

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

+ References

No definition available.

+ Details

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

- Details

Name:	crmt_NoteFDebtFacilitiesDetailsLineItems
Namespace Prefix:	crmt_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of noncash expense included in interest expense to allocate debt discount and premium, and the costs to issue debt and obtain financing over the related debt instruments. Alternate captions include noncash interest expense.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585

+ Details

Name:	us-gaap_AmortizationOfFinancingCostsAndDiscounts
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- 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:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Date the credit facility terminates, in CCYY-MM-DD format.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.19(b),22(b))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 22

-Article 5

+ Details

Name:	us-gaap_LineOfCreditFacilityExpirationDate1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

The effective interest rate at the end of the reporting period.

+ References

+ Details

Name:	us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd
Namespace Prefix:	us-gaap_
Data Type:	num: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

+ Details

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

- Definition

Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

+ References

+ Details

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

- Details

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

- Details

Name:	us-gaap_LongtermDebtTypeAxis=crmt_CreditFacilitiesAmendmentNumber2Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=crmt_CreditFacilitiesAmendmentNumber3Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=crmt_CreditFacilitiesAmendmentNumber4Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=crmt_CreditFacilitiesAmendmentNumber5Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Note F - Debt Facilities (Details) (USD $)	12 Months Ended			0 Months Ended
Note F - Debt Facilities (Details) (USD $)	Apr. 30, 2015	Apr. 30, 2014	Apr. 30, 2013	Feb. 04, 2013	Jun. 24, 2013	Oct. 08, 2014	Feb. 13, 2014	Sep. 30, 2012	Mar. 09, 2012
Note F - Debt Facilities (Details) [Line Items]
Line of Credit Facility, Distribution Limitations, Percentage of Sum of Borrowing Bases	30.00%
Line of Credit Facility, Distribution Limitations, Percentage of Consolidated Net income	75.00%
Line of Credit Facility, Distribution Limitations, Minimum Percentage of Aggregate Funds Available	12.50%
Amortization of Financing Costs and Discounts	$ 188,000	$ 209,000	$ 209,000
Credit Facilities, Amendment No. 2 [Member] \| Revolving Credit Facility [Member] \| Minimum [Member]
Note F - Debt Facilities (Details) [Line Items]
Contract Term of Contracts Included by Credit Facilities Amendment				36 months
Credit Facilities, Amendment No. 2 [Member] \| Revolving Credit Facility [Member] \| Maximum [Member]
Note F - Debt Facilities (Details) [Line Items]
Contract Term of Contracts Included by Credit Facilities Amendment				42 months
Credit Facilities, Amendment No. 3 [Member] \| Revolving Credit Facility [Member]
Note F - Debt Facilities (Details) [Line Items]
Line of Credit Facility, Expiration Date					Jun. 24, 2016
Line of Credit Facility, Additional Borrowing Capacity					55,000,000
Decrease in Pricing Tiers, Percent					0.25%
Credit Facilities, Amendment No. 4 [Member] \| Revolving Credit Facility [Member]
Note F - Debt Facilities (Details) [Line Items]
Maximum Allowable Capital Expenditures By Credit Facilities Amendment							10,000,000
Credit Facilities, Amendment No. 5 [Member] \| Revolving Credit Facility [Member]
Note F - Debt Facilities (Details) [Line Items]
Line of Credit Facility, Expiration Date						Oct. 08, 2017
Increase in Pricing Tiers, Percent						0.125%
Dividend Restrictions, Maximum Aggregate Amount of Stock Repurchases						40,000,000
Dividend Restrictions, Percentage of Sum of Borrowing Bases						30.00%
Revolving Credit Facility [Member] \| London Interbank Offered Rate (LIBOR) [Member]
Note F - Debt Facilities (Details) [Line Items]
Debt Instrument, Basis Spread on Variable Rate	2.375%
Revolving Credit Facility [Member]
Note F - Debt Facilities (Details) [Line Items]
Line of Credit Facility, Interest Rate at Period End	2.56%	2.40%
Line of Credit Facility, Maximum Borrowing Capacity	145,000,000							145,000,000	125,000,000
Line of Credit Facility, Expiration Date	Oct. 08, 2017
Dividend Restrictions, Maximum Aggregate Amount of Stock Repurchases	40,000,000
Line of Credit Facility, Distribution Limitations, Percentage of Sum of Borrowing Bases	30.00%
Line of Credit Facility, Distribution Limitations, Percentage of Consolidated Net income	75.00%
Line of Credit Facility, Distribution Limitations, Minimum Percentage of Aggregate Funds Available						12.50%
Line of Credit Facility, Remaining Borrowing Capacity	$ 38,900,000