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Significant Accounting Policies (Details) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Apr. 30, 2020 USD ($) people state segment merchandise_category store | Apr. 30, 2019 USD ($) | Apr. 30, 2018 USD ($) | May 01, 2018 USD ($) | Apr. 30, 2017 USD ($)
Accounting Policies [Abstract] |  |  |  |  |
Number of stores | store | 2,207 |  |  |  |
Number of states in which entity operates | state | 16 |  |  |  |
Population of communities (many less than) | people | 5,000 |  |  |  |
Concentration Risk |  |  |  |  |
Shareholders' equity | $ 1,643,205 | $ 1,408,769 | $ 1,271,141 |  | $ 1,190,620
Deferred income taxes | 435,598 | 385,788 |  |  |
Excess of current cost over the stated LIFO Value | 87,546 | 80,814 |  |  |
Goodwill | 161,075 | 157,223 |  |  |
Asset impairment charges | 1,177 | 1,167 | 507 |  |
Excise taxes collected | 1,063,000 | 988,000 | $ 919,000 |  |
Contract liability | 11,180 | 6,931 |  |  |
Recorded asset retirement obligation (net of amortization) | 13,416 | 11,793 |  |  |
Discounted liability of asset retirement obligation | 22,658 | 18,058 |  |  |
Self insurance reserve | $ 44,959 | 44,334 |  |  |
Number of operating segments | segment | 1 |  |  |  |
Number of reportable segments | segment | 1 |  |  |  |
Number of merchandise categories | merchandise_category | 3 |  |  |  |
Fuel | Retail Sales |  |  |  |  |
Concentration Risk |  |  |  |  |
Concentration risk percentage | 60.00% |  |  |  |
Grocery and other merchandise | Retail Sales |  |  |  |  |
Concentration Risk |  |  |  |  |
Concentration risk percentage | 28.00% |  |  |  |
Prepared food and fountain | Retail Sales |  |  |  |  |
Concentration Risk |  |  |  |  |
Concentration risk percentage | 12.00% |  |  |  |
Accounting Standards Update 2014-09 | GIft Cards |  |  |  |  |
Concentration Risk |  |  |  |  |
Shareholders' equity |  |  |  | $ 879 |
Deferred income taxes |  |  |  | 321 |
Accounting Standards Update 2014-09 | Box Tops |  |  |  |  |
Concentration Risk |  |  |  |  |
Shareholders' equity |  |  |  | (5,019) |
Deferred income taxes |  |  |  | $ (1,816) |
Capitalized software costs |  |  |  |  |
Concentration Risk |  |  |  |  |
Finite-lived intangible assets | $ 38,593 | $ 27,873 |  |  |
Capitalized software costs | Minimum |  |  |  |  |
Concentration Risk |  |  |  |  |
Intangible asset useful life | 3 years |  |  |  |
Capitalized software costs | Maximum |  |  |  |  |
Concentration Risk |  |  |  |  |
Intangible asset useful life | 13 years |  |  |  |

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