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Significant Accounting Policies (Schedule Of Inventory Values) (Details) (USD $) In Thousands, unless otherwise specified | Apr. 30, 2013 | Apr. 30, 2012
--- | --- | ---
Significant Accounting Policies [Line Items] |  |
Inventory | $ 189,514 | $ 170,794
Gasoline [Member] |  |
Significant Accounting Policies [Line Items] |  |
Inventory | 87,262 | 83,063
Merchandise [Member] |  |
Significant Accounting Policies [Line Items] |  |
Inventory | $ 102,252 | $ 87,731

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- Details
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Namespace Prefix: | casy_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Gross amount, as of the balance sheet date, of merchandise, goods, commodities, or supplies held for future sale or to be used in manufacturing, servicing or production process. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.6(a)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant