Significant Accounting Policies (Details) $ in Thousands		12 Months Ended
	May 13, 2021 USD ($)	Apr. 30, 2024 USD ($) segment merchandise_category store people state	Apr. 30, 2023 USD ($)	Apr. 30, 2022 USD ($)
Accounting Policies [Abstract]
Number of stores | store		2,658
Number of states in which entity operates | state		17
Population of communities (many less than) | people		20,000
Concentration Risk
Excess of current cost over the stated LIFO Value		$ 151,461	$ 138,962
Amortization		14,108	12,302	$ 9,449
Goodwill		652,663	615,342
Asset impairment charges		4,057	3,500	$ 1,056
Contract liability		52,934	55,561
Discounted liability of asset retirement obligation		39,954	36,978
Self insurance reserve		57,369	61,168
Accrued environmental liability		$ 299	268
Number of operating segments | segment		1
Number of reportable segments | segment		1
Number of merchandise categories | merchandise_category		3
Buchanan Energy
Concentration Risk
Intangible assets acquired	$ 31,100
Gift Cards
Concentration Risk
Contract liability		$ 17,985	17,463
Capitalized software costs
Concentration Risk
Finite-lived intangible assets		$ 37,619	42,495
Capitalized software costs | Minimum
Concentration Risk
Intangible asset useful life		2 years
Capitalized software costs | Maximum
Concentration Risk
Intangible asset useful life		13 years
Customer Relationships
Concentration Risk
Intangible assets, net		$ 24,880	26,953
Accumulated amortization		6,220	$ 4,147
Annual amortization, year one		2,073
Annual amortization, year two		2,073
Annual amortization, year three		2,073
Annual amortization, year four		2,073
Annual amortization, year five		$ 2,073
Customer Relationships | Buchanan Energy
Concentration Risk
Useful life	15 years