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v3.19.2

Commitments and Contingencies - Narrative (Details) | 3 Months Ended
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Jul. 31, 2019
Minimum |
Lessee, Lease, Description [Line Items] |
Remaining term of contract | 1 year
Operating lease discount rate | 3.70%
Maximum |
Lessee, Lease, Description [Line Items] |
Remaining term of contract | 41 years 1 month 6 days
Operating lease discount rate | 6.00%

X
- Definition Lessee, Lease, Discount Rate + References No definition available. + Details
Name: | casy_LesseeLeaseDiscountRate
Namespace Prefix: | casy_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Lessee, Lease, Remaining Term of Contract + References No definition available. + Details
Name: | casy_LesseeLeaseRemainingTermofContract
Namespace Prefix: | casy_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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_LesseeLeaseDescriptionLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |