Basis of Presentation (Policies)	3 Months Ended
Basis of Presentation (Policies)	Jul. 31, 2019	Jul. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	The accompanying condensed consolidated financial statements have been prepared by the Company pursuant to the rules and regulations of the Securities and Exchange Commission. Certain information and footnote disclosures normally included in financial statements prepared in accordance with U.S. generally accepted accounting principles (GAAP) have been condensed or omitted pursuant to such rules and regulations.
New Accounting Pronouncements		The Company is a lessee in situations where we lease property and equipment, most commonly land or building, from a lessor. The Company is a lessor in situations where the Company owns land or building and leases a portion or all of the property or equipment to a tenant. In both situations, leases are reported in accordance with ASC Topic 842-Leases. We adopted this guidance as of May 1, 2019 using the modified retrospective approach and elected the cumulative-effect adjustment practical expedient. As a result of the transition method selected, the Company did not restate previously reported comparable periods. As a lessee, the Company recognizes a right-of-use asset representing its right to use the underlying asset for the lease term and a lease liability for the obligation to make lease payments. Both the right-of-use asset and lease liability are initially measured at the present value of the lease payments, with subsequent measurement dependent on the classification of the lease as either a finance or an operating lease. For leases with a term of twelve months or less, we have elected to not recognize lease assets and lease liabilities and will recognize lease expense on a straight-line basis over the lease term. As a lessee, the Company has both operating and financing leases with the right-of-use assets recorded within property and equipment, and the lease liability recorded within long term debt and capital lease obligations. As a lessor, the Company has direct financing leases and records the assets within property and equipment and recognizes the lease payments through other income. All lease activity is considered immaterial to the consolidated financial statements.
Reclassifications	Certain amounts in prior year have been reclassified to conform to current year presentation.
Revenue Recognition	The Company recognizes retail sales of fuel, grocery and other merchandise, prepared food and fountain and other revenue at the time of the sale to the customer. Revenue from sales of pizza that include a redeemable box top coupon are deferred until redemption for the portion of the sale that represents the estimated future redemption of the box top coupon. Gift card revenue is recognized based on the estimated gift card breakage rate over the pro-rata usage of the card. Renewable Identification Numbers (RINs) are treated as a reduction in cost of goods sold in the period the Company commits to a price and agrees to sell the RIN. Vendor rebates are treated as a reduction in cost of goods sold and are recognized pro rata over the period covered by the applicable rebate agreement. Vendor rebates in the form of billbacks are treated as a reduction in cost of goods sold and are recognized at the time the product is sold. Warehousing costs are recorded within operating expenses on the income statement. Sales taxes collected from customers and remitted to the government are recorded on a net basis in the consolidated financial statements.