Goodwill (Changes In Carrying Amount Of Goodwill) (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended	12 Months Ended
Sep. 30, 2011	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2009
Goodwill [Line Items]
Goodwill (gross)	$ 3,034.4	$ 3,034.4	$ 3,025.2	$ 2,445.6
Accumulated impairment losses	(444.3)	(444.3)	(79.5)	(59.0)
Goodwill (net)	2,590.1	2,590.1	2,945.7	2,386.6
Goodwill acquired			577.4
Goodwill, Impairment Loss		(364.8)	(20.5)
Goodwill, Purchase price allocation adjust		11.5	(0.6)
Goodwill, Income tax adjustments		(0.4)
Currency translation adjustment		(1.9)	2.8
Percentage weight of income approach for estimated fair value calculation	75.00%
Percentage weight of market approach for estimated fair value calculation	25.00%
Non-cash charge to reduce carrying value of goodwill		(364.8)	(20.5)
Non-cash charge per share	$ 6.53
Branded Cereal Products [Member]
Goodwill [Line Items]
Goodwill (gross)	1,794.0	1,794.0	1,794.1	1,794.5
Accumulated impairment losses	(364.8)	(364.8)
Goodwill (net)	1,429.2	1,429.2	1,794.1	1,794.5
Goodwill, Impairment Loss	364.8	(364.8)
Goodwill, Purchase price allocation adjust			(0.6)
Currency translation adjustment		(0.1)	0.2
Non-cash charge to reduce carrying value of goodwill	364.8	(364.8)
Other Cereal Products [Member]
Goodwill [Line Items]
Goodwill (gross)	47.2	47.2	47.2	47.2
Goodwill (net)	47.2	47.2	47.2	47.2
Snacks, Sauces & Spreads [Member]
Goodwill [Line Items]
Goodwill (gross)	292.8	292.8	293.5	252.0
Accumulated impairment losses	(79.5)	(79.5)	(79.5)	(59.0)
Goodwill (net)	213.3	213.3	214.0	193.0
Goodwill acquired			40.6
Goodwill, Impairment Loss			(20.5)
Currency translation adjustment		(0.7)	0.9
Non-cash charge to reduce carrying value of goodwill			(20.5)
Frozen Bakery Products [Member]
Goodwill [Line Items]
Goodwill (gross)	366.3	366.3	367.7	351.9
Goodwill (net)	366.3	366.3	367.7	351.9
Goodwill acquired			14.1
Goodwill, Purchase price allocation adjust		0.1
Goodwill, Income tax adjustments		(0.4)
Currency translation adjustment		(1.1)	1.7
Pasta [Member]
Goodwill [Line Items]
Goodwill (gross)	534.1	534.1	522.7
Goodwill (net)	534.1	534.1	522.7
Goodwill acquired			522.7
Goodwill, Purchase price allocation adjust		11.4
Linette Chocolate [Member] \| Snacks, Sauces & Spreads [Member]
Goodwill [Line Items]
Goodwill (net)			0
Goodwill, Impairment Loss			20.5
Goodwill impairment loss after tax			12.9
Goodwill impairment loss per diluted share			$ 0.23
Non-cash charge to reduce carrying value of goodwill			$ 20.5

Estimated Fair Value Calculation Weight Of Income Approach Percentage

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Goodwill impairment loss after tax

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Goodwill, income tax adjustments

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Carrying amount as of the balance sheet date, which is the cumulative amount paid and (if applicable) the fair value of any noncontrolling interest in the acquiree, adjusted for any amortization recognized prior to the adoption of any changes in generally accepted accounting principles (as applicable) and for any impairment charges, in excess of the fair value of net assets acquired in one or more business combination transactions.

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The aggregate amount of goodwill acquired in the period and allocated to the reportable segment. The value is stated at fair value based on the purchase price allocation.

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Purchase price allocation adjustment for allocation not yet complete at the prior year end.

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The accumulated impairment losses related to goodwill as of the balance sheet date.

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Loss recognized during the period that results from the write-down of goodwill after comparing the implied fair value of reporting unit goodwill with the carrying amount of that goodwill. Goodwill is assessed at least annually for impairment.

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The increase (decrease) to the recorded value of goodwill for foreign currency translation adjustments.

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