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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