Debt Instrument, Periodic Payment, Interest Rate, Effective Percentage

No definition available.

Name:	cag_DebtInstrumentPeriodicPaymentInterestRateEffectivePercentage
Namespace Prefix:	cag_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Increase (Decrease) In Interest Expense, Net

+ References

No definition available.

+ Details

Name:	cag_IncreaseDecreaseInInterestExpenseNet
Namespace Prefix:	cag_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Proceeds from termination of interest rate swap contract.

+ References

No definition available.

+ Details

Name:	cag_ProceedsFromTerminationOfInterestRateSwapContract
Namespace Prefix:	cag_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Reduction of net interest expense due to impact of interest rate swap contracts.

+ References

No definition available.

+ Details

Name:	cag_ReductionOfNetInterestExpenseDueToImpactOfInterestRateSwapContracts
Namespace Prefix:	cag_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 10

-Section 25

-Paragraph 23

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Balance Type:	debit
Period Type:	duration

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
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Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of long-term debt before deduction of unamortized discount or premium. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, with initial maturities beyond one year or the normal operating cycle, if longer.

+ 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 210.5-02.22)

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 20

-Article 5

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 16

-Article 9

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 10

-Subparagraph (a)

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-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 12

-URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13476-108611

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

+ 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 210.5-02.22(a)(1))

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-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399

+ Details

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Balance Type:	na
Period Type:	instant

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

+ Details

Name:	us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Fair value amount of debt instrument that was repurchased.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount of debt issuance costs (for example, but not limited to, legal, accounting, broker, and regulatory fees).

+ References

No definition available.

+ Details

Name:	us-gaap_DebtIssuanceCosts
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The effective portion of losses on derivative instruments designated and qualifying as hedging instruments that was recognized in other comprehensive income during the current period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4C

-Subparagraph (b)

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-Name Accounting Standards Codification

-Topic 220

-SubTopic 10

-Section 45

-Paragraph 10A

-Subparagraph (d)

-URI http://asc.fasb.org/extlink&oid=36458714&loc=SL7669646-108580

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Gross amount of debt extinguished.

+ References

No definition available.

+ Details

Name:	us-gaap_ExtinguishmentOfDebtAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 470

-SubTopic 50

-Section 40

-Paragraph 2

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-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (b)

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-Topic 470

-SubTopic 50

-Section 40

-Paragraph 4

-URI http://asc.fasb.org/extlink&oid=49170532&loc=d3e12355-112629

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The amount of cash paid for interest during the period.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 50

-Paragraph 2

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-Topic 230

-SubTopic 10

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-Paragraph 25

-Subparagraph (e)

-URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3536-108585

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.16)

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-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 20, 22

-Article 5

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Including the current and noncurrent portions, aggregate carrying amount of all types of notes payable, as of the balance sheet date, with initial maturities beyond one year or beyond the normal operating cycle, if longer.

+ References

+ Details

Name:	us-gaap_NotesPayable
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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

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-Subparagraph (b)

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-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Including the current and noncurrent portions, carrying value as of the balance sheet date of Notes with the highest claim on the assets of the issuer in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle if longer). Senior note holders are paid off in full before any payments are made to junior note holders.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.7-03.16(a))

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-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.16)

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+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Including the current and noncurrent portions, carrying value as of the balance sheet date of uncollateralized debt obligations (with maturities initially due after one year or beyond the operating cycle if longer).

+ References

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	credit
Period Type:	instant

- Details

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Name:	us-gaap_ExtinguishmentOfDebtAxis=cag_TenderPremiumMember
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LONG-TERM DEBT (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	May. 26, 2013	Nov. 28, 2010	May. 31, 2015	May. 25, 2014	May. 26, 2013
Debt Instrument [Line Items]
Repayments of long-term debt			$ 1,495.2	$ 569.2	$ 2,074.0
Gains (Losses) on Extinguishment of Debt			16.3	(3.7)
Interest paid			337.7	395.6	215.4
Senior notes			7,801.3	8,736.8
Fair value adjustment			163.8
2014 Interest Rate Swap
Debt Instrument [Line Items]
Reduction of net interest expense due to impact of interest rate swap contracts			7.1	4.1
Interest Rate Swap
Debt Instrument [Line Items]
Reduction of net interest expense due to impact of interest rate swap contracts			0.8
Derivative Instruments, Loss Recognized in Other Comprehensive Income (Loss), Effective Portion			12.6
2010 Interest Rate Swap
Debt Instrument [Line Items]
Reduction of net interest expense due to impact of interest rate swap contracts				$ 8.6	9.2
Proceeds from termination of interest rate swap contract		$ 28.2
Tender Premium
Debt Instrument [Line Items]
Gains (Losses) on Extinguishment of Debt			9.5
4.95% Percent Senior Debt Due August 2020
Debt Instrument [Line Items]
Senior notes			$ 282.7
Debt Instrument, Interest Rate, Effective Percentage			2.92%
4.95% senior debt due August 2020 (including Ralcorp senior notes)
Debt Instrument [Line Items]
Interest rate			4.95%	4.95%
Senior notes			$ 300.0	$ 300.0
2023 Maturity
Debt Instrument [Line Items]
Repayments of long-term debt			225.0
2043 Maturity
Debt Instrument [Line Items]
Repayments of long-term debt			200.0
2019 Maturity
Debt Instrument [Line Items]
Repayments of long-term debt			25.0
2018 Maturity
Debt Instrument [Line Items]
Repayments of long-term debt			25.0
2017 Maturity
Debt Instrument [Line Items]
Repayments of long-term debt			$ 25.0
LIBOR plus 1.75% term loans due January 2018
Debt Instrument [Line Items]
Interest rate			1.75%	1.75%
Senior notes			$ 0.0	$ 900.0
LIBOR plus 0.37% term loans due July 2016
Debt Instrument [Line Items]
Notes Payable			$ 550.0
Interest rate			0.37%	0.37%
Senior notes			$ 550.0	$ 0.0
5.875% Senior Debt Due April 2014
Debt Instrument [Line Items]
Repayments of long-term debt				$ 500.0
Interest rate				5.875%
4.65% senior debt due January 2043
Debt Instrument [Line Items]
Repayments of long-term debt				$ 63.0
Interest rate			4.65%	4.65%
Senior notes	$ 1,000.0		$ 737.0	$ 937.0	1,000.0
Ralcorp Notes
Debt Instrument [Line Items]
Long-term Debt, Gross			716.0
Senior notes			33.9
Reduction in net interest expenses			7.8	$ 7.1	2.2
Unsecured Debt
Debt Instrument [Line Items]
Long-term Debt, Gross	716.0		716.0		716.0
Term Facility Agreement
Debt Instrument [Line Items]
Repayments of long-term debt			900.0
Gains (Losses) on Extinguishment of Debt			$ 8.3		6.2
Long-term Line of Credit	1,500.0				1,500.0
Extinguishment of Debt, Amount					600.0
Unsecured Debt	1,500.0				$ 1,500.0
Debt Instrument, Periodic Payment, Interest Rate, Effective Percentage					2.50%
Term Facility Agreement \| Base Rate
Debt Instrument [Line Items]
Interest rate on borrowings					1.75%
1.3% senior debt due January 2016
Debt Instrument [Line Items]
Interest rate			1.30%	1.30%
Senior notes			$ 750.0	$ 750.0
1.9% senior debt due January 2018
Debt Instrument [Line Items]
Interest rate			1.90%	1.90%
Senior notes			$ 1,000.0	$ 1,000.0
3.2% senior debt due January 2023
Debt Instrument [Line Items]
Interest rate			3.20%	3.20%
Senior notes	1,225.0		$ 1,000.0	$ 1,225.0	$ 1,225.0
6.625% senior debt due August 2039 (including Ralcorp senior notes)
Debt Instrument [Line Items]
Interest rate			6.625%	6.625%
Senior notes			$ 450.0	$ 450.0
6.25% Senior Debt Due August 2039
Debt Instrument [Line Items]
Senior notes			$ 433.3
Debt Instrument, Interest Rate, Effective Percentage			4.86%
Unsecured Debt
Debt Instrument [Line Items]
Long-term Debt, Gross	3,975.0		$ 3,975.0		3,975.0
Ralcorp
Debt Instrument [Line Items]
Gains (Losses) on Extinguishment of Debt					1.3
Ralcorp \| 4.95% Ralcorp Senior Notes
Debt Instrument [Line Items]
Interest rate			4.95%
Senior notes			$ 33.9
Ralcorp \| 6.625% Senior Notes Ralcorp Due August 2019
Debt Instrument [Line Items]
Interest rate			6.625%
Senior notes			$ 17.2
Debt Instrument, Interest Rate, Effective Percentage			2.83%
Ralcorp \| Secured Debt
Debt Instrument [Line Items]
Senior notes	$ 460.7				$ 460.7
Ralcorp \| Ralcorp Notes
Debt Instrument [Line Items]
Senior notes			$ 16.7
Debt Instrument, Interest Rate, Effective Percentage			4.82%
Ralcorp \| 7.29% Senior Notes Due August 2018 Issued by Ralcorp
Debt Instrument [Line Items]
Interest rate	7.29%				7.29%
Ralcorp \| 7.39% Senior Notes Due August 2020 Issued by Ralcorp
Debt Instrument [Line Items]
Interest rate	7.39%				7.39%
Senior notes	$ 664.5				$ 664.5
Ralcorp \| 7.29% Senior Notes Due August 2018 Issued by Ralcorp, Ralcorp Discharged Notes
Debt Instrument [Line Items]
Senior notes	33.0				33.0
Debt Instrument, Repurchase Amount	44.8				44.8
Ralcorp \| Ralcorp Callable Notes
Debt Instrument [Line Items]
Senior notes				$ 460.7
Extinguishment of Debt, Amount	562.5
Ralcorp \| Unsecured Debt
Debt Instrument [Line Items]
Long-term Debt, Gross	$ 631.5				631.5
Ralcorp
Debt Instrument [Line Items]
Debt Issuance Cost					52.1
Business Combination, Acquisition Related Costs					$ 27.3