Long-term Debt and Finance Lease Obligations, Lines of Credit and Fair Value Disclosure	9 Months Ended
	Jan. 31, 2022
Long-Term Debt and Fair Value Disclosure [Abstract]
Long-term Debt and Finance Lease Obligations, Lines of Credit and Fair Value Disclosure	Long-Term Debt and Finance Lease Obligations, Lines of Credit and Fair Value Disclosure The fair value of the Company’s long-term debt (including current maturities) is estimated based on the current rates offered to the Company for debt of the same or similar issuances. The fair value of the Company’s long-term debt was approximately $1,773,000 and $1,391,000 at January 31, 2022 and April 30, 2021, respectively. The fair value calculated excludes finance lease obligations of $72,176 and $14,085 outstanding at January 31, 2022 and April 30, 2021, respectively, which are grouped with long-term debt on the condensed consolidated balance sheets. Term Loan Facilities In order to fund the acquisition of Buchanan Energy (see Note 6) the Company drew a senior unsecured term loan in the aggregate principal amount of $300 million during the first quarter of fiscal 2022. During the third quarter, the Company amended its existing credit agreement to (a) provide for a new senior unsecured term loan in the aggregate principal amount of $150 million (collectively with the $300 million term loan, the "Term Loan Facilities") and (b) decrease the minimum index for LIBOR-based loans, which includes both the Term Loan Facilities and the Revolver Facility, discussed below. The proceeds of the $150 million term loan were, in-part, utilized to fund the acquisition of 40 stores from Pilot Corporation (see Note 6). Amounts borrowed under the Term Loan Facilities bear interest at variable rates based upon, at the Company’s option, either: (i) the Adjusted LIBO Rate, plus a margin ranging from 1.55% to 2.60%; or (ii) the ABR Rate, plus a margin ranging from 0.20% to 1.60%. The Company currently has elected the Adjusted LIBO Rate, and there is an option to elect either rate in subsequent interest periods. The Term Loan Facilities also carry a facility fee of 0.20% to 0.40% per annum. The applicable margins and facility fee are dependent upon the Company's Consolidated Leverage Ratio, as defined in the credit agreement establishing the Term Loan Facilities as calculated quarterly. The outstanding principal balance is required to be repaid in equal quarterly installments in an amount equal to 1.25% of the original principal amount, on the last day of each March, June, September and December, with the balance of the Term Loan Facilities due on January 6, 2026. The Company had an outstanding principal balance of $438,750 on the Term Loan Facilities at January 31, 2022. Of that outstanding balance, $67,500 has been recognized as current maturities of long-term debt on the condensed consolidated balance sheets at January 31, 2022; $22,500 related to our obligations under the credit agreement and $45,000 related to the Company’s intentions to prepay a portion of the balance within the next 12 months. Revolving Facility The Company has a committed unsecured revolving credit facility in the aggregate principal amount of $450,000 (the "Revolving Facility"). The maturity date for the revolving facility is January 11, 2024. Amounts borrowed under the Revolving Facility bear interest at variable rates based upon, at the Company’s option, either: (a) the LIBO Rate adjusted for statutory reserve requirements (but no less than 0.50%), plus a margin ranging from 1.05% to 1.85%; or (b) an alternate base rate, which is the higher of (i) the prime rate announced by the Administrative Agent, (ii) the federal funds rate plus 1/2 of 1.00%, and (iii) the one-month LIBO Rate plus 1.00%, plus a margin ranging from 0.05% to 0.85%. The Revolving Facility also carries a facility fee of 0.20% to 0.40% per annum. The applicable margins and facility fee are dependent upon the Company’s Consolidated Leverage Ratio, as noted above. The Company had $0 outstanding under the Revolving Facility at January 31, 2022 and April 30, 2021. Bank Line The Company has an additional unsecured bank line of credit (the "Bank Line") with availability up to $25,000. The Bank Line bears interest at a variable rate subject to change from time to time based on changes in an independent index referred to in the Bank Line as the Federal Funds Offered Rate (the “Index”). There was $0 outstanding under the Bank Line at January 31, 2022 and April 30, 2021. The Bank Line is due upon demand

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.