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Significant Accounting Policies (Details) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Apr. 30, 2019 USD ($) people state segment store merchandise_category | Apr. 30, 2018 USD ($) | Apr. 30, 2017 USD ($) | May 01, 2018 USD ($) | Apr. 30, 2016 USD ($)
Accounting Policies [Abstract] |  |  |  |  |
Number of stores | store | 2,146 |  |  |  |
Number of states in which entity operates | state | 16 |  |  |  |
Population of communities (many less than) | people | 5,000 |  |  |  |
Concentration Risk |  |  |  |  |
Shareholders' equity | $ 1,408,769 | $ 1,271,141 | $ 1,190,620 |  | $ 1,083,463
Deferred income taxes | 385,788 | 341,946 |  |  |
Excess of current cost over the stated LIFO Value | 80,814 | 73,494 |  |  |
Goodwill | 157,223 | 140,258 |  |  |
Asset impairment charges | 1,167 | 507 | 705 |  |
Recorded asset retirement obligation (net of amortization) | 11,793 | 11,280 |  |  |
Discounted liability of asset retirement obligation | 18,058 | 17,087 |  |  |
Self insurance reserve | $ 44,334 | 39,777 |  |  |
Number of operating segments | segment | 1 |  |  |  |
Number of reportable segments | segment | 1 |  |  |  |
Number of merchandise categories | merchandise_category | 3 |  |  |  |
Fuel |  |  |  |  |
Concentration Risk |  |  |  |  |
Excise taxes collected | $ 988,000 | $ 919,000 | $ 866,000 |  |
Fuel | Retail Sales |  |  |  |  |
Concentration Risk |  |  |  |  |
Concentration risk percentage | 63.00% |  |  |  |
Grocery & other merchandise | Retail Sales |  |  |  |  |
Concentration Risk |  |  |  |  |
Concentration risk percentage | 26.00% |  |  |  |
Prepared food & fountain | Retail Sales |  |  |  |  |
Concentration Risk |  |  |  |  |
Concentration risk percentage | 11.00% |  |  |  |
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) |

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