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v3.24.1.u1

Property and Equipment (Narrative) (Details) $ in Millions | Mar. 31, 2024 USD ($)
--- | ---
Property, Plant and Equipment [Abstract] |
BuildingsLandPPENet | $ 27.5

X
- Definition BuildingsLandPPENet + References No definition available. + Details
Name: | cacc_BuildingsLandPPENet
Namespace Prefix: | cacc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- References No definition available. + Details
Name: | us-gaap_PropertyPlantAndEquipmentAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration