Segment Reporting - Segment Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Apr. 30, 2025	Apr. 30, 2024	Apr. 30, 2023
Segment Reporting Information [Line Items]
Total revenue	$ 15,940,899	$ 14,862,913	$ 15,094,475
Cost of goods sold (excluding depreciation and amortization, shown separately below)	12,188,496	11,515,002	12,022,069
Operating expenses	2,552,356	2,288,513	2,119,942
Depreciation and amortization	403,647	349,797	313,131
Interest, net	83,951	53,441	51,815
Income before income taxes	712,449	656,160	587,518
Federal and state income taxes	165,929	154,188	140,827
Net income	546,520	501,972	446,691
Reportable Segment
Segment Reporting Information [Line Items]
Total revenue	15,940,899	14,862,913	15,094,475
Cost of goods sold (excluding depreciation and amortization, shown separately below)	12,188,496	11,515,002	12,022,069
Same-store employee expense	975,186	940,560	861,840
Same-store other expense	480,378	454,480	393,067
Same-store credit card fees expense	212,399	211,681	201,579
Non same-store operating expense	305,604	170,420	204,938
Other	578,789	511,372	458,518
Operating expenses	2,552,356	2,288,513	2,119,942
Depreciation and amortization	403,647	349,797	313,131
Interest, net	83,951	53,441	51,815
Income before income taxes	712,449	656,160	587,518
Federal and state income taxes	165,929	154,188	140,827
Net income	546,520	501,972	446,691
Reportable Segment | Prepared food & dispensed beverage
Segment Reporting Information [Line Items]
Cost of goods sold (excluding depreciation and amortization, shown separately below)	674,322	603,305	574,155
Reportable Segment | Grocery & general merchandise
Segment Reporting Information [Line Items]
Cost of goods sold (excluding depreciation and amortization, shown separately below)	2,691,879	2,456,867	2,289,326
Reportable Segment | Fuel
Segment Reporting Information [Line Items]
Cost of goods sold (excluding depreciation and amortization, shown separately below)	8,539,339	8,285,400	8,952,397
Reportable Segment | Other
Segment Reporting Information [Line Items]
Cost of goods sold (excluding depreciation and amortization, shown separately below)	$ 282,956	$ 169,430	$ 206,191