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Presentation of Financial Statements - Narrative (Details) people in Thousands | Jan. 31, 2022 store state people
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Organization, Consolidation and Presentation of Financial Statements [Abstract] |
Number of stores | store | 2,431
Number of states in which entity operates | state | 17
Population of communities | people | 5

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- 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

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- 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

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- 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

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