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Document And Entity Information (USD $)
 12 Months Ended
Apr. 30, 2014
Jun. 23, 2014
Oct. 31, 2013
Document and Entity Information [Abstract]      
Entity Registrant Name Caseys General Stores Inc,    
Document Type 10-K    
Current Fiscal Year End Date --04-30    
Entity Common Stock, Shares Outstanding   37,882,157  
Entity Public Float     $ 2,600,000,000
Amendment Flag true    
Amendment Description EXPLANATORY NOTECasey's General Stores, Inc. (the "Company") is filing this Amendment No. 1 on Form 10-K/A to its Annual Report on Form 10-K for the fiscal year ended April 30, 2014, originally filed with the Securities and Exchange Commission (SEC) on June 27, 2014 (the "Original Filing"), to make the following changes: 1.To amend Item 1A. Risk Factors to add an additional risk factor regarding the potential adverse impact the material weakness could have on our timely reporting of financial results, investor confidence, and stock price.2.To amend Item 8. Financial Statements, Report of Independent Registered Public Accounting Firm, in relation to the independent registered public accounting firm's report on our internal control over financial reporting; and3.To make revisions for immaterial errors in the consolidated financial statements for the three-year period ended April 30, 2014 previously issued in the Original Filing in Item 1. Business, Item 6. Selected Financial Data, and Item 7. Management's Discussion and Analysis of Financial Condition and Results of Operations.4.To amend Item 9A. Controls and Procedures related to the effectiveness of our disclosure controls and procedures and internal control over financial reporting;In the second quarter of fiscal year 2015, through a routine Internal Revenue Service (IRS) examination, management became aware that an inadvertent accounting and reporting error occurred during the fiscal years 2012, 2013, and 2014 and the first quarter of fiscal year 2015. A control deficiency was identified with regards to the review and approval of quarterly federal excise tax returns by management with the requisite skill and knowledge, and recognition of the corresponding liability and expense. The internal controls in place during this time were not responsive to changes in circumstances. While the control deficiency did not result in a material misstatement to the Company's consolidated financial statements for any periods through and including the fiscal year ended April 30, 2014, or unaudited condensed consolidated financial statements for the first fiscal quarter of fiscal year 2015, it did represent a material weakness as of April 30, 2014, since there existed a reasonable possibility that a material misstatement of the Company's annual or interim financial statements would not be prevented or detected on a timely basis. The correction of these immaterial errors is being recognized in revisions to our consolidated financial statements for the fiscal year ended April 30, 2014 in this Amendment No. 1 and in revisions to the unaudited condensed consolidated financial statements for the fiscal quarter ended July 31, 2014, included on Form 10-Q/A dated December 9, 2014 to be filed concurrently with this Form 10K/A.Pursuant to Rule 12b-15 under the Securities Exchange act of 1934, as a result of this Amendment No. 1, the certifications pursuant to Rules 13a-14(a)/15(d)-14(a) under the Securities Exchange Act of 1934, as amended and Section 906 of the Sarbanes-Oxley Act of 2002 have been re-executed and refiled as of the date of this Amendment No. 1. As a result, the Exhibit Index in Part IV; Item 15 of the Annual Report is also being amended to reflect the inclusion of the aforementioned updates. Accordingly, we hereby amend Items 1, 1A, 6, 7, 8, 9A, and 15 in the Original Filing. Except as described in this Explanatory Note, the Original Filing is unchanged. In particular, except for the events described above, this Amendment No. 1 speaks only as of the date the Original Filing was filed, and has not been updated, amended, or supplemented to give effect to any subsequent events. Accordingly, forward-looking statements included in this Amendment No. 1 represent management's views as of the date the Original Filing was filed and should not be assumed to be accurate as of any date thereafter. This Amendment No. 1 should be read in conjunction with the Original Filing, and any of Company's other filings with the SEC subsequent to the Original Filing, together with any amendments to those filings.    
Entity Central Index Key 0000726958    
Entity Current Reporting Status Yes    
Entity Voluntary Filers No    
Entity Filer Category Large Accelerated Filer    
Entity Well-known Seasoned Issuer Yes    
Document Period End Date Apr. 30, 2014    
Document Fiscal Year Focus 2014    
Document Fiscal Period Focus FY