Basis of Presentation (Policies)	6 Months Ended
Basis of Presentation (Policies)	Oct. 31, 2019	Oct. 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. The preparation of financial statements in conformity with U.S. generally accepted accounting principles requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates.
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. Please refer to Note 6 for additional information regarding the Company’s adoption of ASC 842 and the outstanding leases.
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. Revenue related to the box top coupons is expected to be recognized less than one year from the original sale to the customer. As of October 31, 2019 and April 30, 2019, the Company recognized a contract liability of $8,329 and $6,931, respectively, related to the outstanding box top coupons, which is included in accrued expenses on the condensed consolidated balance sheets. Gift card related revenue is recognized as the gift cards are used by the customer. Gift card breakage 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 condensed consolidated financial statements.
Lessor Leases	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 lessor related activity is considered immaterial to the condensed consolidated financial statements. The leases initially recorded under ASC 842 were recognized, at the time of adoption, at an amount equal to the present value of the lease payments using the incremental borrowing rate of debt based upon the remaining term of the lease. New leases are recognized at the present value of the lease payments using the implicit rate when it is readily determinable. In the case the implicit rate is not readily determinable, the Company uses the incremental borrowing rate of debt based on the term of the lease. Several leases have variable payment components of the lease such as payments for property taxes and insurance. For these leases, the Company has not included those variable payments in the calculation of the lease liability as the payments are not in-substance fixed and do not depend on an index or rate. These variable payments will be expensed as incurred. The Company also has options to renew or extend the current lease arrangement on many of our leases. In these situations, if it was reasonably certain the lease would be extended, we have included those extensions within the remaining lease payments at the time of measurement.
Lessee Leases	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. 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. The Company records the operating lease liability in 'Accrued expenses' and other long-term liabilities and records the finance lease liability within current maturities of long-term debt and long term debt and finance lease obligations on the condensed consolidated balance sheets. We have elected to adopt the package of practical expedients, as well as the land easement practical expedient. 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 lessor related activity is considered immaterial to the condensed consolidated financial statements. The leases initially recorded under ASC 842 were recognized, at the time of adoption, at an amount equal to the present value of the lease payments using the incremental borrowing rate of debt based upon the remaining term of the lease. New leases are recognized at the present value of the lease payments using the implicit rate when it is readily determinable. In the case the implicit rate is not readily determinable, the Company uses the incremental borrowing rate of debt based on the term of the lease. Several leases have variable payment components of the lease such as payments for property taxes and insurance. For these leases, the Company has not included those variable payments in the calculation of the lease liability as the payments are not in-substance fixed and do not depend on an index or rate. These variable payments will be expensed as incurred. The Company also has options to renew or extend the current lease arrangement on many of our leases. In these situations, if it was reasonably certain the lease would be extended, we have included those extensions within the remaining lease payments at the time of measurement.