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Significant Accounting Policies (Details) $ in Thousands | 12 Months Ended
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Apr. 30, 2016 USD ($) people state segment merchandise_category store | Apr. 30, 2015 USD ($) | Apr. 30, 2014 USD ($)
Accounting Policies [Abstract] |  |  |
Number of stores | store | 1,931 |  |
Number of states in which entity operates | state | 14 |  |
Population of communities (many less than) | people | 5,000 |  |
Concentration Risk |  |  |
Excess of current cost over the stated LIFO Value | $ 58,432 | $ 53,428 |
Goodwill | 128,566 | 127,046 |
Asset impairment charges | 1,625 | 1,785 | $ 2,542
Recorded asset retirement obligation (net of amortization) | 9,788 | 9,234 |
Discounted liability of asset retirement obligation | 14,975 | 14,014 |
Self-insurance reserves | $ 35,535 | 31,389 |
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 | $ 818,000 | $ 715,000 | $ 646,000
Fuel | Retail Sales |  |  |
Concentration Risk |  |  |
Concentration risk percentage | 59.00% |  |
Grocery & other merchandise | Retail Sales |  |  |
Concentration Risk |  |  |
Concentration risk percentage | 29.00% |  |
Prepared food & fountain | Retail Sales |  |  |
Concentration Risk |  |  |
Concentration risk percentage | 12.00% |  |

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