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SHARE-BASED PAYMENTS (Narrative) (Details) (USD $) In Millions, except Per Share data, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Feb. 22, 2015 | Feb. 23, 2014 | Feb. 22, 2015 | Feb. 23, 2014
Stock Based Compensation Activity [Line Items] |  |  |  |
Total stock-based compensation expense | $ 11.4 us-gaap_AllocatedShareBasedCompensationExpense | $ 11.7 us-gaap_AllocatedShareBasedCompensationExpense | $ 46.4 us-gaap_AllocatedShareBasedCompensationExpense | $ 45.9 us-gaap_AllocatedShareBasedCompensationExpense
Stock option granted |  |  | 3.8 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod |
Weighted average exercise price of stock options granted |  |  | $ 30.89 cag_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrices |
Weighted average value of stock options granted during the first three quarters of fiscal 2014 |  |  | $ 3.28 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue |
Performance period ending 2015 |  |  |  |
Stock Based Compensation Activity [Line Items] |  |  |  |
Percentage of the targeted number of performance shares, minimum range and will be paid in shares of common stock |  |  | 0.00%cag_PercentageOfTargetedNumberOfPerformanceSharesMinimumRangeAndWillBePaidInSharesOfCommonStock / us-gaap_PlanNameAxis = cag_PerformancePeriodEndingTwoThousandFifteenMember |
Percentage of the targeted number of performance shares, maximum range and will be paid in shares of common stock |  |  | 220.00%cag_PercentageOfTargetedNumberOfPerformanceSharesMaximumRangeAndWillBePaidInSharesOfCommonStock / us-gaap_PlanNameAxis = cag_PerformancePeriodEndingTwoThousandFifteenMember |
Percentage of target incentive required payout |  |  | 25.00%cag_PercentageOfTargetIncentiveRequiredPayout / us-gaap_PlanNameAxis = cag_PerformancePeriodEndingTwoThousandFifteenMember |
Performance period ending 2014 |  |  |  |
Stock Based Compensation Activity [Line Items] |  |  |  |
Percentage of the targeted number of performance shares, minimum range and will be paid in shares of common stock |  |  | 0.00%cag_PercentageOfTargetedNumberOfPerformanceSharesMinimumRangeAndWillBePaidInSharesOfCommonStock / us-gaap_PlanNameAxis = cag_PerformancePeriodEndingTwoThousandFourteenMember |
Percentage of the targeted number of performance shares, maximum range and will be paid in shares of common stock |  |  | 220.00%cag_PercentageOfTargetedNumberOfPerformanceSharesMaximumRangeAndWillBePaidInSharesOfCommonStock / us-gaap_PlanNameAxis = cag_PerformancePeriodEndingTwoThousandFourteenMember |
Percentage of target incentive required payout |  |  | 25.00%cag_PercentageOfTargetIncentiveRequiredPayout / us-gaap_PlanNameAxis = cag_PerformancePeriodEndingTwoThousandFourteenMember |
Restricted stock |  |  |  |
Stock Based Compensation Activity [Line Items] |  |  |  |
Stock granted, shares |  |  | 0.9 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember |
Weighted average value of stock options granted |  |  | $ 31.36 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember |
Cash-settled restricted stock units |  |  |  |
Stock Based Compensation Activity [Line Items] |  |  |  |
Stock granted, shares |  |  | 0.9 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = cag_CashSettledRestrictedStockUnitMember |
Weighted average value of stock options granted |  |  | $ 30.89 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = cag_CashSettledRestrictedStockUnitMember |
Performance shares |  |  |  |
Stock Based Compensation Activity [Line Items] |  |  |  |
Stock granted, shares |  |  | 0.4 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember |
Weighted average value of stock options granted |  |  | $ 30.89 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember |
Subsidiaries |  |  |  |
Stock Based Compensation Activity [Line Items] |  |  |  |
Total stock-based compensation expense | $ 0.3 us-gaap_AllocatedShareBasedCompensationExpense / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | $ 0.2 us-gaap_AllocatedShareBasedCompensationExpense / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | $ 0.9 us-gaap_AllocatedShareBasedCompensationExpense / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | $ 2.3 us-gaap_AllocatedShareBasedCompensationExpense / dei_LegalEntityAxis = us-gaap_SubsidiariesMember

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Net number of share options (or share units) granted during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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