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Significant Accounting Policies (Details) people in Thousands, $ in Thousands | 12 Months Ended
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Apr. 30, 2015 USD ($) people state segment store | Apr. 30, 2014 USD ($) merchandise_category | Apr. 30, 2013 USD ($)
Accounting Policies [Abstract] |  |  |
Number of stores | store | 1,878 |  |
Number of states in which entity operates | state | 14 |  |
Population of communities (many less than) | people | 5 |  |
Concentration Risk |  |  |
Excess of current cost over the stated LIFO Value | $ 53,428 | $ 48,777 |
Goodwill | 127,046 | 120,406 |
Asset impairment charges | 1,785 | 2,542 | $ 3,680
Recorded asset retirement obligation (net of amortization) | 9,234 | 8,391 |
Discounted liability of asset retirement obligation | 14,014 | 12,854 |
Self-insurance reserves | $ 31,389 | $ 28,429 |
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 | $ 715,000 | $ 646,000 | $ 596,000
Fuel | Retail Sales |  |  |
Concentration Risk |  |  |
Concentration risk percentage | 66.00% |  |
Grocery & Other Merchandise | Retail Sales |  |  |
Concentration Risk |  |  |
Concentration risk percentage | 24.00% |  |
Prepared Food & Fountain | Retail Sales |  |  |
Concentration Risk |  |  |
Concentration risk percentage | 10.00% |  |

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- Definition Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=51824106&loc=d3e2420-110228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585 + Details
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