XML 59 R51.htm IDEA: XBRL DOCUMENT
v2.4.0.6

Contingencies (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended | 66 Months Ended |
--- | --- | --- | ---
Apr. 30, 2012 | Apr. 30, 2012 | Apr. 30, 2011
Contingencies [Abstract] |  |  |
Accrued liability | $ 380 | $ 380 | $ 231
Number of lawsuits - "hot fuel" cases | 4 | 45 |
Number of jurisdictions |  | 27 |
Number of states |  | 25 |
Annual stop loss limit | 1,000 |  |
Letters of credit outstanding | 15,000 | 15,000 | 12,000
Investments in escrow for insurance | 223 |  |
Accrued expenses for estimated claims relating to self insurance | $ 23,701 | $ 23,701 | $ 22,129

X
- Definition Accrued Expenses For Estimated Claims Relating To Self Insurance + References No definition available. + Details
Name: | casy_AccruedExpensesForEstimatedClaimsRelatingToSelfInsurance
Namespace Prefix: | casy_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Annual Stop Loss Limit + References No definition available. + Details
Name: | casy_AnnualStopLossLimit
Namespace Prefix: | casy_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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

X
- Definition Investments In Escrow For Insurance + References No definition available. + Details
Name: | casy_InvestmentsInEscrowForInsurance
Namespace Prefix: | casy_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Number of Jurisdictions + References No definition available. + Details
Name: | casy_NumberOfJurisdictions
Namespace Prefix: | casy_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number Of Lawsuits + References No definition available. + Details
Name: | casy_NumberOfLawsuits
Namespace Prefix: | casy_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number Of States + References No definition available. + Details
Name: | casy_NumberOfStates
Namespace Prefix: | casy_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
Name: | us-gaap_LettersOfCreditOutstandingAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Carrying value as of the balance sheet date of obligations incurred through that date and payable arising from transactions not otherwise specified in the taxonomy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 15 -Subparagraph 5 -Article 9 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.15(5)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.15(a)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 15 -Subparagraph a -Article 7 + Details
Name: | us-gaap_OtherAccruedLiabilitiesCurrentAndNoncurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant