Subsequent Event	12 Months Ended
Sep. 30, 2011
Subsequent Event [Abstract]
Subsequent Event	NOTE 23 – SUBSEQUENT AND PENDING EVENTS On October 3, 2011, Ralcorp completed the acquisition of the North American private brand refrigerated dough business of Sara Lee Corp. The refrigerated dough business is a leading manufacturer and distributor of a full range of private brand refrigerated dough products in the U.S. To fund the $545 transaction, Ralcorp entered into a short-term financing arrangement that is expected to be repaid with a portion of the proceeds generated by financing to be incurred in connection with the separation of its Post cereals business (discussed in the following paragraph). The refrigerated dough business, which will operate as part of the Frozen Bakery Products segment, employs approximately 700 people and has manufacturing and distribution facilities in Carrollton, Texas and Forest Park, Georgia. Because the initial accounting for this business combination is incomplete, the Company cannot currently provide all of the disclosures required for a business combination. The identification and valuation of acquired intangible assets, the appraisal of acquired property, and other significant accounting analyses have not been completed. Therefore, the Company cannot currently determine and disclose the amounts recognized as of the acquisition date for each major class of assets acquired and liabilities assumed. Similarly, the Company cannot currently determine and disclose revenue and earnings of Ralcorp as though this business combination had occurred as of the beginning of each of the periods presented (supplemental pro forma information). Among other pro forma adjustments, the calculation of this supplemental pro forma information requires adjustments for amortization of intangible assets, which will be based upon the fair value and estimated useful lives of acquired intangible assets. While goodwill associated with the acquisition is expected to be attributable to the assembled workforce of the acquired business and the significant synergies and opportunities expected from the combination of the acquired business with existing Ralcorp businesses (especially the businesses in the Frozen Bakery Products segment), the amount of that goodwill has not yet been determined. Similarly, while goodwill is expected to be deductible for tax purposes, the amount of that goodwill for tax purposes has not yet been determined. On July 14, 2011, Ralcorp announced that its board of directors agreed in principle to separate Ralcorp and Post (the Branded Cereal Products segment) in a tax-free spin-off to Ralcorp shareholders. At or prior to this transaction, Post is expected to issue debt, with a portion of the proceeds going to Ralcorp. This transaction remains subject to receipt of an Internal Revenue Service ruling, final approval by Ralcorp's board of directors and other customary conditions, but is expected to be completed in the first half of fiscal 2012.

NOTE 23 – SUBSEQUENT AND PENDING EVENTS

On October 3, 2011, Ralcorp completed the acquisition of the North American private brand refrigerated dough business of Sara Lee Corp. The refrigerated dough business is a leading manufacturer and distributor of a full range of private brand refrigerated dough products in the U.S. To fund the $545 transaction, Ralcorp entered into a short-term financing arrangement that is expected to be repaid with a portion of the proceeds generated by financing to be incurred in connection with the separation of its Post cereals business (discussed in the following paragraph). The refrigerated dough business, which will operate as part of the Frozen Bakery Products segment, employs approximately 700 people and has manufacturing and distribution facilities in Carrollton, Texas and Forest Park, Georgia. Because the initial accounting for this business combination is incomplete, the Company cannot currently provide all of the disclosures required for a business combination. The identification and valuation of acquired intangible assets, the appraisal of acquired property, and other significant accounting analyses have not been completed. Therefore, the Company cannot currently determine and disclose the amounts recognized as of the acquisition date for each major class of assets acquired and liabilities assumed. Similarly, the Company cannot currently determine and disclose revenue and earnings of Ralcorp as though this business combination had occurred as of the beginning of each of the periods presented (supplemental pro forma information). Among other pro forma adjustments, the calculation of this supplemental pro forma information requires adjustments for amortization of intangible assets, which will be based upon the fair value and estimated useful lives of acquired intangible assets. While goodwill associated with the acquisition is expected to be attributable to the assembled workforce of the acquired business and the significant synergies and opportunities expected from the combination of the acquired business with existing Ralcorp businesses (especially the businesses in the Frozen Bakery Products segment), the amount of that goodwill has not yet been determined. Similarly, while goodwill is expected to be deductible for tax purposes, the amount of that goodwill for tax purposes has not yet been determined.

On July 14, 2011, Ralcorp announced that its board of directors agreed in principle to separate Ralcorp and Post (the Branded Cereal Products segment) in a tax-free spin-off to Ralcorp shareholders. At or prior to this transaction, Post is expected to issue debt, with a portion of the proceeds going to Ralcorp. This transaction remains subject to receipt of an Internal Revenue Service ruling, final approval by Ralcorp's board of directors and other customary conditions, but is expected to be completed in the first half of fiscal 2012.