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Pay vs Performance Disclosure - USD ($) | 12 Months Ended
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Apr. 30, 2023 | Apr. 30, 2022 | Apr. 30, 2021
Pay vs Performance Disclosure [Table] |  |  |
Pay vs Performance [Table Text Block] | PAY VERSUS PERFORMANCE DISCLOSURE Pursuant to Section 953(a) of the Dodd-Frank Act and Item 402(v) of Regulation S-K, the following table sets forth information regarding certain financial performance metrics of the Company and the “compensation actually paid” (“CAP”) to our NEOs, using a methodology that has been prescribed by the SEC. The C/HC Committee does not utilize CAP as the basis for making compensation decisions. For further information concerning our compensation philosophy and how we align executive compensation with our performance, see the CD&A.
​ | Pay Versus Performance Table | ​
​ | Fiscal Year | ​ | ​ | Summary Compensation Table For PEO(1)(3) | ​ | ​ | CAP to PEO(1)(2) | ​ | ​ | Average Summary Compensation Table for Non-PEO NEOs(1)(3) | ​ | ​ | Average CAP to Non-PEO NEOs(1)(2) | ​ | ​ | Value of Initial Fixed $100 Investment based on:(4) | ​ | ​ | GAAP Net Income | ​ | ​ | EBITDA(5) | ​
​ | Casey’s TSR | ​ | ​ | Peer Group TSR | ​
​ | 2023 | ​ | ​ | $10,523,938 | ​ | ​ | $17,915,532 | ​ | ​ | $2,910,280 | ​ | ​ | $4,846,542 | ​ | ​ | $154 | ​ | ​ | $147 | ​ | ​ | $446,691,000 | ​ | ​ | $952,464,000 | ​
​ | 2022 | ​ | ​ | $9,061,083 | ​ | ​ | $9,698,036 | ​ | ​ | $2,862,173 | ​ | ​ | $3,706,912 | ​ | ​ | $135 | ​ | ​ | $136 | ​ | ​ | $339,790,000 | ​ | ​ | $801,241,000 | ​
​ | 2021 | ​ | ​ | $8,186,093 | ​ | ​ | $13,776,583 | ​ | ​ | $2,813,117 | ​ | ​ | $3,877,559 | ​ | ​ | $148 | ​ | ​ | $121 | ​ | ​ | $312,900,000 | ​ | ​ | $719,244,000 | ​
(1) | Mr. Rebelez served as our principal executive officer (PEO) for the full fiscal year in 2023, 2022, and 2021. Reflects other NEOs for the applicable years as follows: (i) for 2021, Mr. Rebelez, Mr. Bramlage, Ms. Williams, Julia L. Jackowski (the Company’s former Chief Legal Officer), Adrian M. Butler (the Company’s former Chief Information Officer) and William J. Walljasper (the Company’s former Chief Financial Officer), (ii) for 2022, Mr. Rebelez, Mr. Bramlage, Ms. Williams, Mr. Brennan and Mr. Butler, and (iii) for 2023, Mr. Rebelez, Mr. Bramlage, Ms. Williams, Mr. Brennan and Mr. Frazell.
(2) | The following amounts were deducted from and/or added to Summary Compensation Table (“SCT”) total compensation in accordance with the SEC-mandated adjustments to calculate CAP. The fair value of equity awards was determined using methodologies and assumptions developed in a manner substantively consistent with those used to determine the grant date fair value of such awards:
| ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |
| ​ | ​ |  | ​ | ​ | 2023 | ​ | ​ | 2022 | ​ | ​ | 2021 | ​ | ​ |
| ​ | ​ | Figures reflected in $000s | ​ | ​ | PEO | ​ | ​ | Average other NEOs | ​ | ​ | PEO | ​ | ​ | Average other NEOs | ​ | ​ | PEO | ​ | ​ | Average other NEOs | ​
| ​ | ​ | Summary Comp. Table Total | ​ | ​ | $10,524 | ​ | ​ | $2,910 | ​ | ​ | $9,061 | ​ | ​ | $2,862 | ​ | ​ | $8,186 | ​ | ​ | $2,813 | ​ | ​ |
| ​ | ​ | Grant Date Fair Value of Current Fiscal Year Awards | ​ | ​ | ($6,337) | ​ | ​ | ($1,348) | ​ | ​ | ($5,377) | ​ | ​ | ($1,240) | ​ | ​ | ($4,547) | ​ | ​ | ($1,583) | ​ | ​ |
| ​ | ​ | Fair Value Current Fiscal Year Awards at Fiscal Year End | ​ | ​ | $7,469 | ​ | ​ | $1,617 | ​ | ​ | $5,129 | ​ | ​ | $1,187 | ​ | ​ | $5,759 | ​ | ​ | $2,047 | ​ | ​ |
| ​ | ​ | Change in Fair Value of Prior Fiscal Year Awards (Outstanding) | ​ | ​ | $6,468 | ​ | ​ | $1,625 | ​ | ​ | $1,110 | ​ | ​ | $884 | ​ | ​ | $4,324 | ​ | ​ | $554 | ​ | ​ |
| ​ | ​ | Change in Fair Value of Prior Fiscal Year Awards (Vested) | ​ | ​ | ($385) | ​ | ​ | ($2) | ​ | ​ | ($316) | ​ | ​ | ($15) | ​ | ​ | $42 | ​ | ​ | $42 | ​
| ​ | ​ | Dividends Accrued in Fiscal Year | ​ | ​ | $176 | ​ | ​ | $44 | ​ | ​ | $91 | ​ | ​ | $29 | ​ | ​ | $13 | ​ | ​ | $6 | ​ | ​ |
| ​ | ​ | Compensation Actually Paid | ​ | ​ | $17,916 | ​ | ​ | $4,847 | ​ | ​ | $9,698 | ​ | ​ | $3,707 | ​ | ​ | $13,777 | ​ | ​ | $3,878 | ​ | ​ |
| ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​
(3) | Reflects the total compensation reported in the SCT for the applicable year for Mr. Rebelez as the PEO and the average of the total compensation reported in the SCT for the applicable year for each of the other NEOs listed in Footnote 1.
(4) | Reflects TSR, cumulative for the measurement periods beginning on May 1, 2020, and ending on each of April 30, 2021, 2022 and 2023, the last day of each fiscal year, respectively, calculated in accordance with Item 201(e) of Regulation S-K. “Peer Group” represents the S&P 1500 Consumer Staples Sector Index (“CAP Peer Group”).
(5) | Reflects the “company selected measure.” EBITDA is a non-GAAP measure defined as net income before net interest expense, income taxes, depreciation and amortization. See Appendix A for reconciliation to net income.
Company Selected Measure Name | EBITDA |  |
Named Executive Officers, Footnote [Text Block] |
(1) | Mr. Rebelez served as our principal executive officer (PEO) for the full fiscal year in 2023, 2022, and 2021. Reflects other NEOs for the applicable years as follows: (i) for 2021, Mr. Rebelez, Mr. Bramlage, Ms. Williams, Julia L. Jackowski (the Company’s former Chief Legal Officer), Adrian M. Butler (the Company’s former Chief Information Officer) and William J. Walljasper (the Company’s former Chief Financial Officer), (ii) for 2022, Mr. Rebelez, Mr. Bramlage, Ms. Williams, Mr. Brennan and Mr. Butler, and (iii) for 2023, Mr. Rebelez, Mr. Bramlage, Ms. Williams, Mr. Brennan and Mr. Frazell.
Peer Group Issuers, Footnote [Text Block] |
(4) | Reflects TSR, cumulative for the measurement periods beginning on May 1, 2020, and ending on each of April 30, 2021, 2022 and 2023, the last day of each fiscal year, respectively, calculated in accordance with Item 201(e) of Regulation S-K. “Peer Group” represents the S&P 1500 Consumer Staples Sector Index (“CAP Peer Group”).
PEO Total Compensation Amount | $ 10,523,938 | $ 9,061,083 | $ 8,186,093
PEO Actually Paid Compensation Amount | $ 17,915,532 | 9,698,036 | 13,776,583
Adjustment To PEO Compensation, Footnote [Text Block] |
(2) | The following amounts were deducted from and/or added to Summary Compensation Table (“SCT”) total compensation in accordance with the SEC-mandated adjustments to calculate CAP. The fair value of equity awards was determined using methodologies and assumptions developed in a manner substantively consistent with those used to determine the grant date fair value of such awards:
| ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |
| ​ | ​ |  | ​ | ​ | 2023 | ​ | ​ | 2022 | ​ | ​ | 2021 | ​ | ​ |
| ​ | ​ | Figures reflected in $000s | ​ | ​ | PEO | ​ | ​ | Average other NEOs | ​ | ​ | PEO | ​ | ​ | Average other NEOs | ​ | ​ | PEO | ​ | ​ | Average other NEOs | ​
| ​ | ​ | Summary Comp. Table Total | ​ | ​ | $10,524 | ​ | ​ | $2,910 | ​ | ​ | $9,061 | ​ | ​ | $2,862 | ​ | ​ | $8,186 | ​ | ​ | $2,813 | ​ | ​ |
| ​ | ​ | Grant Date Fair Value of Current Fiscal Year Awards | ​ | ​ | ($6,337) | ​ | ​ | ($1,348) | ​ | ​ | ($5,377) | ​ | ​ | ($1,240) | ​ | ​ | ($4,547) | ​ | ​ | ($1,583) | ​ | ​ |
| ​ | ​ | Fair Value Current Fiscal Year Awards at Fiscal Year End | ​ | ​ | $7,469 | ​ | ​ | $1,617 | ​ | ​ | $5,129 | ​ | ​ | $1,187 | ​ | ​ | $5,759 | ​ | ​ | $2,047 | ​ | ​ |
| ​ | ​ | Change in Fair Value of Prior Fiscal Year Awards (Outstanding) | ​ | ​ | $6,468 | ​ | ​ | $1,625 | ​ | ​ | $1,110 | ​ | ​ | $884 | ​ | ​ | $4,324 | ​ | ​ | $554 | ​ | ​ |
| ​ | ​ | Change in Fair Value of Prior Fiscal Year Awards (Vested) | ​ | ​ | ($385) | ​ | ​ | ($2) | ​ | ​ | ($316) | ​ | ​ | ($15) | ​ | ​ | $42 | ​ | ​ | $42 | ​
| ​ | ​ | Dividends Accrued in Fiscal Year | ​ | ​ | $176 | ​ | ​ | $44 | ​ | ​ | $91 | ​ | ​ | $29 | ​ | ​ | $13 | ​ | ​ | $6 | ​ | ​ |
| ​ | ​ | Compensation Actually Paid | ​ | ​ | $17,916 | ​ | ​ | $4,847 | ​ | ​ | $9,698 | ​ | ​ | $3,707 | ​ | ​ | $13,777 | ​ | ​ | $3,878 | ​ | ​ |
| ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​
Non-PEO NEO Average Total Compensation Amount | $ 2,910,280 | 2,862,173 | 2,813,117
Non-PEO NEO Average Compensation Actually Paid Amount | $ 4,846,542 | 3,706,912 | 3,877,559
Adjustment to Non-PEO NEO Compensation Footnote [Text Block] |
(2) | The following amounts were deducted from and/or added to Summary Compensation Table (“SCT”) total compensation in accordance with the SEC-mandated adjustments to calculate CAP. The fair value of equity awards was determined using methodologies and assumptions developed in a manner substantively consistent with those used to determine the grant date fair value of such awards:
| ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |
| ​ | ​ |  | ​ | ​ | 2023 | ​ | ​ | 2022 | ​ | ​ | 2021 | ​ | ​ |
| ​ | ​ | Figures reflected in $000s | ​ | ​ | PEO | ​ | ​ | Average other NEOs | ​ | ​ | PEO | ​ | ​ | Average other NEOs | ​ | ​ | PEO | ​ | ​ | Average other NEOs | ​
| ​ | ​ | Summary Comp. Table Total | ​ | ​ | $10,524 | ​ | ​ | $2,910 | ​ | ​ | $9,061 | ​ | ​ | $2,862 | ​ | ​ | $8,186 | ​ | ​ | $2,813 | ​ | ​ |
| ​ | ​ | Grant Date Fair Value of Current Fiscal Year Awards | ​ | ​ | ($6,337) | ​ | ​ | ($1,348) | ​ | ​ | ($5,377) | ​ | ​ | ($1,240) | ​ | ​ | ($4,547) | ​ | ​ | ($1,583) | ​ | ​ |
| ​ | ​ | Fair Value Current Fiscal Year Awards at Fiscal Year End | ​ | ​ | $7,469 | ​ | ​ | $1,617 | ​ | ​ | $5,129 | ​ | ​ | $1,187 | ​ | ​ | $5,759 | ​ | ​ | $2,047 | ​ | ​ |
| ​ | ​ | Change in Fair Value of Prior Fiscal Year Awards (Outstanding) | ​ | ​ | $6,468 | ​ | ​ | $1,625 | ​ | ​ | $1,110 | ​ | ​ | $884 | ​ | ​ | $4,324 | ​ | ​ | $554 | ​ | ​ |
| ​ | ​ | Change in Fair Value of Prior Fiscal Year Awards (Vested) | ​ | ​ | ($385) | ​ | ​ | ($2) | ​ | ​ | ($316) | ​ | ​ | ($15) | ​ | ​ | $42 | ​ | ​ | $42 | ​
| ​ | ​ | Dividends Accrued in Fiscal Year | ​ | ​ | $176 | ​ | ​ | $44 | ​ | ​ | $91 | ​ | ​ | $29 | ​ | ​ | $13 | ​ | ​ | $6 | ​ | ​ |
| ​ | ​ | Compensation Actually Paid | ​ | ​ | $17,916 | ​ | ​ | $4,847 | ​ | ​ | $9,698 | ​ | ​ | $3,707 | ​ | ​ | $13,777 | ​ | ​ | $3,878 | ​ | ​ |
| ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​
Compensation Actually Paid vs. Total Shareholder Return [Text Block] | The chart below illustrates the relationship between the PEO and average Non-PEO CAP amounts and the Company’s and CAP Peer Group’s TSR during fiscal years 2021-2023. |  |
Compensation Actually Paid vs. Net Income [Text Block] | The charts below illustrate the relationship between the PEO and average Non-PEO CAP amounts and the Company’s net income and EBITDA during fiscal years 2021-2023. |  |
Compensation Actually Paid vs. Company Selected Measure [Text Block] | The charts below illustrate the relationship between the PEO and average Non-PEO CAP amounts and the Company’s net income and EBITDA during fiscal years 2021-2023. |  |
Total Shareholder Return Vs Peer Group [Text Block] | The chart below illustrates the relationship between the PEO and average Non-PEO CAP amounts and the Company’s and CAP Peer Group’s TSR during fiscal years 2021-2023. |  |
Tabular List [Table Text Block] | Performance Measures Used to Link Company Performance and CAP The following table lists the performance measures that, in our assessment, represent the most important performance measures we used to link compensation actually paid to our NEOs to Company performance for the 2023 fiscal year. See the CD&A beginning on page 28 for further details.
​ | Tabular List of Performance Measures | ​
​ | EBITDA | ​ | ​ | Same-Store Sales Growth % (Inside Sales) | ​ | ​ | Gross Profit Dollars (Fuel) | ​ | ​ | ROIC | ​ | ​ | Relative TSR | ​
Total Shareholder Return Amount | $ 154 | 135 | 148
Peer Group Total Shareholder Return Amount | 147 | 136 | 121
Net Income (Loss) | $ 446,691,000 | $ 339,790,000 | $ 312,900,000
Company Selected Measure Amount | 952,464,000 | 801,241,000 | 719,244,000
PEO Name | Mr. Rebelez | Mr. Rebelez | Mr. Rebelez
Measure [Axis]: 1 |  |  |
Pay vs Performance Disclosure [Table] |  |  |
Measure Name | EBITDA |  |
Non-GAAP Measure Description [Text Block] |
(5) | Reflects the “company selected measure.” EBITDA is a non-GAAP measure defined as net income before net interest expense, income taxes, depreciation and amortization. See Appendix A for reconciliation to net income.
Measure [Axis]: 2 |  |  |
Pay vs Performance Disclosure [Table] |  |  |
Measure Name | Same-Store Sales Growth % (Inside Sales) |  |
Measure [Axis]: 3 |  |  |
Pay vs Performance Disclosure [Table] |  |  |
Measure Name | Gross Profit Dollars (Fuel) |  |
Measure [Axis]: 4 |  |  |
Pay vs Performance Disclosure [Table] |  |  |
Measure Name | ROIC |  |
Measure [Axis]: 5 |  |  |
Pay vs Performance Disclosure [Table] |  |  |
Measure Name | Relative TSR |  |
PEO [Member] | Grant Date Fair Value of Current Fiscal Year Awards [Member] |  |  |
Pay vs Performance Disclosure [Table] |  |  |
Adjustment to Compensation Amount | $ (6,337,000) | $ (5,377,000) | $ (4,547,000)
PEO [Member] | Fair Value Current Fiscal Year Awards at Fiscal Year End [Member] |  |  |
Pay vs Performance Disclosure [Table] |  |  |
Adjustment to Compensation Amount | 7,469,000 | 5,129,000 | 5,759,000
PEO [Member] | Change in Fair Value of Prior Fiscal Year Awards (Outstanding) [Member] |  |  |
Pay vs Performance Disclosure [Table] |  |  |
Adjustment to Compensation Amount | 6,468,000 | 1,110,000 | 4,324,000
PEO [Member] | Change in Fair Value of Prior Fiscal Year Awards (Vested) [Member] |  |  |
Pay vs Performance Disclosure [Table] |  |  |
Adjustment to Compensation Amount | (385,000) | (316,000) | 42,000
PEO [Member] | Dividends Accrued in Fiscal Year [Member] |  |  |
Pay vs Performance Disclosure [Table] |  |  |
Adjustment to Compensation Amount | 176,000 | 91,000 | 13,000
Non-PEO NEO [Member] | Grant Date Fair Value of Current Fiscal Year Awards [Member] |  |  |
Pay vs Performance Disclosure [Table] |  |  |
Adjustment to Compensation Amount | (1,348,000) | (1,240,000) | (1,583,000)
Non-PEO NEO [Member] | Fair Value Current Fiscal Year Awards at Fiscal Year End [Member] |  |  |
Pay vs Performance Disclosure [Table] |  |  |
Adjustment to Compensation Amount | 1,617,000 | 1,187,000 | 2,047,000
Non-PEO NEO [Member] | Change in Fair Value of Prior Fiscal Year Awards (Outstanding) [Member] |  |  |
Pay vs Performance Disclosure [Table] |  |  |
Adjustment to Compensation Amount | 1,625,000 | 884,000 | 554,000
Non-PEO NEO [Member] | Change in Fair Value of Prior Fiscal Year Awards (Vested) [Member] |  |  |
Pay vs Performance Disclosure [Table] |  |  |
Adjustment to Compensation Amount | (2,000) | (15,000) | 42,000
Non-PEO NEO [Member] | Dividends Accrued in Fiscal Year [Member] |  |  |
Pay vs Performance Disclosure [Table] |  |  |
Adjustment to Compensation Amount | $ 44,000 | $ 29,000 | $ 6,000

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