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Significant Accounting Policies (Details) $ in Thousands |  | 12 Months Ended |
--- | --- | --- | ---
May 13, 2021 USD ($) store | Apr. 30, 2022 USD ($) store segment people merchandise_category state | Apr. 30, 2021 USD ($) | Apr. 30, 2020 USD ($) | Apr. 30, 2019 USD ($)
Accounting Policies [Abstract] |  |  |  |  |
Number of stores | store |  | 2,452 |  |  |
Number of states in which entity operates | state |  | 16 |  |  |
Population of communities (many less than) | people |  | 5,000 |  |  |
Concentration Risk |  |  |  |  |
Goodwill |  | $ 612,934 | $ 161,075 |  |
Shareholders' equity |  | 2,240,838 | 1,932,679 | $ 1,643,205 | $ 1,408,769
Deferred income taxes |  | 520,472 | 439,721 |  |
Contract liability |  | 41,577 | 30,719 |  |
Excess of current cost over the stated LIFO Value |  | 114,731 | 93,158 |  |
Asset impairment charges |  | 1,056 | 3,846 | $ 1,177 |
Discounted liability of asset retirement obligation |  | 28,604 | 24,411 |  |
Self insurance reserve |  | $ 53,752 | 50,526 |  |
Number of operating segments | segment |  | 1 |  |  |
Number of reportable segments | segment |  | 1 |  |  |
Number of merchandise categories | merchandise_category |  | 3 |  |  |
Buchanan Energy |  |  |  |  |
Accounting Policies [Abstract] |  |  |  |  |
Number of stores | store | 92 |  |  |  |
Concentration Risk |  |  |  |  |
Goodwill | $ 254,679 |  |  |  |
Contractual customer relationships | $ 31,100 |  |  |  |
Useful life | 15 years |  |  |  |
Gift Cards |  |  |  |  |
Concentration Risk |  |  |  |  |
Contract liability |  | $ 15,509 | 13,096 |  |
Capitalized software costs |  |  |  |  |
Concentration Risk |  |  |  |  |
Finite-lived intangible assets |  | $ 41,337 | $ 42,881 |  |
Capitalized software costs | Minimum |  |  |  |  |
Concentration Risk |  |  |  |  |
Intangible asset useful life |  | 3 years |  |  |
Capitalized software costs | Maximum |  |  |  |  |
Concentration Risk |  |  |  |  |
Intangible asset useful life |  | 13 years |  |  |
Customer Relationships |  |  |  |  |
Concentration Risk |  |  |  |  |
Finite-Lived Intangible Assets, Net |  | $ 29,027 |  |  |
Finite-Lived Intangible Assets, Accumulated Amortization |  | $ 2,073 |  |  |
Customer Relationships | Buchanan Energy |  |  |  |  |
Concentration Risk |  |  |  |  |
Useful life | 15 years |  |  |  |

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