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Presentation of Financial Statements - Narrative (Details) people in Thousands	Oct. 31, 2023 people state store
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Number of stores | store	2,592
Number of states in which entity operates | state	16
Population of communities | people	5

X

- Definition

Population Of Communities

+ References

No definition available.

+ Details

Name:	casy_PopulationOfCommunities
Namespace Prefix:	casy_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

The number of states the entity operates in as of the balance sheet date.

+ References

No definition available.

+ Details

Name:	us-gaap_NumberOfStatesInWhichEntityOperates
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Represents the number of stores.

+ References

No definition available.

+ Details

Name:	us-gaap_NumberOfStores
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- References

No definition available.

+ Details

Name:	us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
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