Commitments and Contingencies - Narrative (Details) - Pending Litigation - employee		3 Months Ended
Oct. 13, 2023	Jul. 31, 2025
McColley V. Casey's General Stores, Inc.
Other Commitments [Line Items]
Number of participants		1,400
Kessler V. Casey's Marketing Company
Other Commitments [Line Items]
Number of participants	550

Number of plaintiffs that have filed claims pertaining to a loss contingency.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 450
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483076/450-20-50-4

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 450
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 9
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483076/450-20-50-9

Name:	us-gaap_LossContingencyNumberOfPlaintiffs
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration