XML 107 R92.htm IDEA: XBRL DOCUMENT
v3.20.4

Stock-Based Compensation Plans (Schedule Of Future Share-Based Compensation Cost) (Details) $ in Millions | Dec. 31, 2020 USD ($)
--- | ---
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
2020 | $ 2.4
2021 | 1.2
2022 | 0.8
2023 | 0.5
2024 | 0.3
Thereafter | 0.2
Total | 5.4
Restricted Stock Units (RSUs) [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
2020 | 1.2
2021 | 0.3
2022 | 0.1
2023 | 0.0
2024 | 0.0
Thereafter | 0.0
Total | 1.6
Restricted Stock [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
2020 | 1.2
2021 | 0.9
2022 | 0.7
2023 | 0.5
2024 | 0.3
Thereafter | 0.2
Total | $ 3.8

X
- Definition Employee Service Share Based Compensation Estimated Allocation Of Recognized Period Costs After Five Years + References No definition available. + Details
Name: | cacc_EmployeeServiceShareBasedCompensationEstimatedAllocationOfRecognizedPeriodCostsAfterFiveYears
Namespace Prefix: | cacc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Employee Service Share Based Compensation Estimated Allocation Of Recognized Period Costs In Five Years + References No definition available. + Details
Name: | cacc_EmployeeServiceShareBasedCompensationEstimatedAllocationOfRecognizedPeriodCostsInFiveYears
Namespace Prefix: | cacc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Employee Service Share Based Compensation Estimated Allocation Of Recognized Period Costs In Four Years + References No definition available. + Details
Name: | cacc_EmployeeServiceShareBasedCompensationEstimatedAllocationOfRecognizedPeriodCostsInFourYears
Namespace Prefix: | cacc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Employee Service Share Based Compensation Estimated Allocation Of Recognized Period Costs In Three Years + References No definition available. + Details
Name: | cacc_EmployeeServiceShareBasedCompensationEstimatedAllocationOfRecognizedPeriodCostsInThreeYears
Namespace Prefix: | cacc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Employee Service Share Based Compensation Estimated Allocation Of Recognized Period Costs In Two Years + References No definition available. + Details
Name: | cacc_EmployeeServiceShareBasedCompensationEstimatedAllocationOfRecognizedPeriodCostsInTwoYears
Namespace Prefix: | cacc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Employee Service Share Based Compensation Estimated Allocation Of Recognized Period Costs Next Twelve Months + References No definition available. + Details
Name: | cacc_EmployeeServiceShareBasedCompensationEstimatedAllocationOfRecognizedPeriodCostsNextTwelveMonths
Namespace Prefix: | cacc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Employee Service Share Based Compensation Estimated Allocation Of Recognized Period Costs Total + References No definition available. + Details
Name: | cacc_EmployeeServiceShareBasedCompensationEstimatedAllocationOfRecognizedPeriodCostsTotal
Namespace Prefix: | cacc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_AwardTypeAxis=us-gaap_RestrictedStockUnitsRSUMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AwardTypeAxis=us-gaap_RestrictedStockMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |