Post (POST) 10-Q 7 Feb 14 2014 Q1 Quarterly report Financial data

Document_and_Entity_Informatio

Document and Entity Information	3 Months Ended
	Dec. 31, 2013	Feb. 05, 2014
Document Information	'	'
Entity Registrant Name	'Post Holdings, Inc.	'
Entity Central Index Key	'0001530950	'
Current Fiscal Year End Date	'--09-30	'
Entity Filer Category	'Large Accelerated Filer	'
Document Type	'10-Q	'
Document Period End Date	31-Dec-13	'
Document Fiscal Year Focus	'2014	'
Document Fiscal Period Focus	'Q1	'
Amendment Flag	'false	'
Entity Common Stock, Shares Outstanding	'	32,693,019

Consolidated_Statements_of_Ope

Consolidated Statements of Operations (USD $)	3 Months Ended
In Millions, except Per Share data, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Income Statement [Abstract]	'	'
Net Sales	$297	$236.90
Cost of goods sold	182.5	131.2
Gross Profit	114.5	105.7
Selling, general and administrative expenses	83	72.1
Amortization of intangible assets	5.7	3.2
Restructuring expense	0.5	0
Other operating expenses, net	0.1	0.1
Operating (Loss) Profit	25.2	30.3
Interest Expense	29	19.2
Earnings before Income Taxes	-3.8	11.1
Income tax benefit (provision)	-1.4	3.5
Net Earnings	-2.4	7.6
Income (Loss) From Continuing Operations, Before Equity Method Investments, Net of Taxes	-2.4	'
Preferred stock dividends	-2.6	0
Net (Loss) Earnings Available to Common Stockholders	($5)	$7.60
Earnings per share, Basic (in usd per share)	($0.15)	$0.23
Earnings Per Share, Diluted (in usd per share)	($0.15)	$0.23
Weighted-Average Common Shares Outstanding, Basic (in shares)	32.7	32.6
Weighted-Average Common Shares Outstanding: Diluted (in shares)	32.7	32.7

Consolidated_Statements_of_Com

Consolidated Statements of Comprehensive Income (Loss) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Net Earnings	($2.40)	$7.60
Pension and postretirement benefit adjustments, net of tax	-0.1	0.3
Foreign currency translation adjustments	-2.2	-0.8
Total comprehensive (loss) income	-4.7	7.1
Pension and postretirement benefit tax adjustments	$0.10	($0.20)

Consolidated_Statements_of_Com1

Consolidated Statements of Comprehensive Income (Loss) Parentheticals (USD $)	3 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Statement of Comprehensive Income [Abstract]	'	'
Pension and postretirement benefit tax adjustments	$0.10	($0.20)

Consolidated_Balance_Sheets

Consolidated Balance Sheets (USD $)	Dec. 31, 2013	Sep. 30, 2013
In Millions, unless otherwise specified
Assets	'	'
Cash and cash equivalents	$884.90	$402
Restricted Cash and Cash Equivalents, Current	1.1	38.1
Receivables, net	84.9	83.2
Inventories	120.8	121.9
Deferred Tax Assets, Net of Valuation Allowance, Current	12.1	11.9
Prepaid expenses and other current assets	10.8	11
Total current assets	1,114.60	668.1
Property, net	387.7	388.5
Goodwill	1,489.60	1,489.70
Other intangible assets, net	892.7	898.4
Cash Advance for Acquisition	366.2	0
Deferred Tax Assets, Net of Valuation Allowance	2.2	2.4
Investment in partnership	0	0
Other assets	36.1	26.7
Total Assets	4,289.10	3,473.80
Liabilities and Ralcorp Equity	'	'
Accounts payable	56.8	77.1
Other current liabilities	94.3	68.9
Total current liabilities	151.1	146
Long-term Debt, Excluding Current Maturities	1,932.90	1,408.60
Deferred income taxes	302.4	304.3
Other liabilities	117	116.3
Total liabilities	2,503.40	1,975.20
Stockholders' Equity	'	'
Preferred stock	0.1	0
Common stock	0.3	0.3
Additional paid-in capital	1,811.20	1,517.20
Retained earnings	42.9	47.6
Accumulated other comprehensive (loss) income	-15.4	-13.1
Treasury Stock, Value	-53.4	-53.4
Total Stockholders' Equity	1,785.70	1,498.60
Total Liabilities and Stockholders' Equity	$4,289.10	$3,473.80

Consolidated_Statements_of_Cas

Consolidated Statements of Cash Flows (USD $)	3 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Cash Flows from Operating Activities:	'	'
Net Earnings	($2,400,000)	$7,600,000
Adjustments to reconcile of net (loss) earnings to net cash provided by operating activities:	'	'
Depreciation and amortization	21,100,000	16,200,000
Premium from issuance of long-term debt	0	15,000,000
Stock-based compensation expense	3,400,000	2,500,000
Deferred income taxes	-1,800,000	-3,800,000
Other, net	-1,900,000	200,000
Other changes in current assets and liabilities, net	'	'
Decrease (increase) in receivables	-2,000,000	-9,800,000
Increase in receivable from Ralcorp	0	-900,000
Decrease (increase) in inventories	800,000	-19,000,000
(Increase) decrease in prepaid expenses and other current assets	1,400,000	5,700,000
(Decrease) increase in accounts payable and other current liabilities	6,300,000	9,900,000
Net Cash Provided by Operating Activities	24,900,000	23,600,000
Cash Flows from Investing Activities:	'	'
Payments to Acquire Businesses, Net of Cash Acquired	0	-9,200,000
Increase Decrease in Cash Advance for Acquisition	-366,200,000	0
Additions to property and intangible assets	-16,500,000	-5,000,000
Increase (Decrease) in Restricted Cash	37,000,000	0
Net cash used by investing activities	-345,700,000	-14,200,000
Cash Flows from Financing Activities:	'	'
Proceeds from issuance of Senior Notes	-525,000,000	-250,000,000
Proceeds from Issuance of Preferred Stock and Preference Stock	290,800,000	0
Repayments of long-term debt	0	-2,200,000
Payments of Ordinary Dividends, Preferred Stock and Preference Stock	-2,300,000	0
Payments of debt issuance costs	-8,800,000	-4,600,000
Proceeds from (Payments for) Other Financing Activities	-100,000	200,000
Net Cash Provided by (Used in) Financing Activities	804,600,000	243,400,000
Effect of exchange rate changes on cash	-900,000	-100,000
Net (decrease) increase in cash and cash equivalents	482,900,000	252,700,000
Cash and cash equivalents, beginning of year	402,000,000	58,200,000
Cash and cash equivalents, end of year	$884,900,000	$310,900,000

Background

Background	3 Months Ended
	Dec. 31, 2013
Organization, Consolidation and Presentation of Financial Statements [Abstract]	'
Background	'
	NOTE 1 — BACKGROUND
	Post Holdings, Inc. (“Post” or the “Company”) is a consumer goods company operating in the center-of-the-store, active nutrition and private label food categories. Most of the Company’s products are manufactured through a flexible production platform consisting of five primary facilities, four of which are owned by Post, and sold through a variety of channels such as grocery stores, mass merchandisers, club stores and drug stores. Post operates in three reportable segments: Post Foods, Attune Foods and Active Nutrition. The Post Foods segment predominately includes the Post branded ready-to-eat cereal business. The Attune Foods segment manufactures and distributes premium natural organic cereals and snacks and is comprised of the businesses of Attune Foods, Inc., which we acquired substantially all of the assets of in December 2012, and certain assets of the Hearthside Food Solutions private label and branded businesses, which we acquired in May 2013. The Active Nutrition segment includes the business of Premier Nutrition Corporation (“PNC”), which we acquired in September 2013. The Active Nutrition segment manufactures and sells high protein shakes and bars as well as nutritional supplements. Post’s portfolio of brands includes diverse offerings such as Honey Bunches of Oats®, Pebbles™, Post Selects®, Great Grains®, Spoon Size® Shredded Wheat, Post® Raisin Bran, Grape-Nuts®, Honeycomb®, Attune®, Uncle Sam®, Erewhon®, Golden Temple™, Peace Cereal®, Sweet Home Farm®, Willamette Valley Granola Company™, Premier Protein® and Joint Juice®.
	Post Foods’ products are manufactured at four facilities located in Battle Creek, Michigan; Jonesboro, Arkansas; Modesto, California; and Niagara Falls, Ontario. Attune Foods’ products are primarily manufactured at a facility located in Eugene, Oregon, and Premier Nutrition Corporation’s products are manufactured under third-party co-manufacturing agreements. Refer to Note 2 for details regarding the announced closure of the Modesto, California facility.
	Unless otherwise stated or the context otherwise indicates, all references in this Form 10-Q to “Post,” “the Company,” “us,” “our” or “we” mean Post Holdings, Inc. and its consolidated subsidiaries.
	Basis of Presentation
	These unaudited condensed consolidated financial statements have been prepared in accordance with generally accepted accounting principles in the United States (“GAAP”), under the rules and regulations of the United States Securities and Exchange Commission (the “SEC”), and on a basis substantially consistent with the audited consolidated financial statements of the Company as of and for the fiscal year ended September 30, 2013. These unaudited condensed consolidated financial statements should be read in conjunction with such audited consolidated financial statements, which are included in the Company’s Annual Report on Form 10-K filed with the SEC on November 27, 2013.
	These unaudited condensed consolidated financial statements include all adjustments (consisting of normal recurring adjustments and accruals) that management considers necessary for a fair statement of its financial position, results of operations, comprehensive income and cash flows for the interim periods presented. Interim results are not necessarily indicative of the results for any other interim period or for the entire fiscal year.
	The financial position and operating results of foreign operations are consolidated using the local currency as the functional currency. Local currency assets and liabilities are translated at the rates of exchange on the balance sheet date, and local currency revenues and expenses are translated at average rates of exchange during the period. Resulting translation gains or losses are included in the condensed consolidated balance sheet as a component of accumulated other comprehensive loss.
	Use of Estimates
	The preparation of the financial statements in conformity with GAAP requires management to make estimates, judgments and assumptions that affect the amounts reported in the condensed consolidated financial statements and footnotes thereto. Actual results could differ from those estimates. Significant estimates inherent in the preparation of the condensed consolidated financial statements include accounting for reserves established for doubtful accounts, stock-based compensation, impairment analyses, depreciation and amortization, income taxes, litigation matters and contingencies.
	Recently Adopted Accounting Standards
	In the first quarter of fiscal 2014, Post adopted Accounting Standards Update 2013-02, “Reporting Amounts Reclassified out of Accumulated Other Comprehensive Income.” The only reclassification out of accumulated other comprehensive income for the reported periods is amortization of actuarial (benefit) loss and prior service cost for pension and postretirement benefits totaling $(0.2) and $0.5 for the periods ended December 31, 2013 and 2012, respectively. Amounts are classified as “Selling, general and administrative expenses” on the statements of operations.

Business_Combinations

Business Combinations	3 Months Ended
	Dec. 31, 2013
Business Combinations [Abstract]	'
Business Combinations	'
	NOTE 3 — BUSINESS COMBINATIONS
	On December 31, 2012, Post Foods, LLC, a subsidiary of the Company, purchased substantially all of the assets of Attune Foods, Inc. (“Attune”) for approximately $9.2 of cash. On October 1, 2013, these assets were contributed to Post Holdings, Inc. in a non-cash tax-free transaction.
	On May 28, 2013, the Company completed its acquisition of certain assets of the branded and private label cereal, granola and snacks business of Hearthside Food Solutions (“Hearthside”) for approximately $159.9 of cash. The Company combined this business with the Attune business to form the Attune Foods reporting segment (see Note 15).
	On September 3, 2013, the Company completed its acquisition of Premier Nutrition Corporation (“PNC”), which was effective September 1, 2013, for approximately $186.0 of cash. PNC is reported in Post’s Active Nutrition segment (see Note 15). During the first quarter of fiscal 2014, a final settlement of net working capital, as defined in the PNC purchase agreement, was reached resulting in an increase in total consideration of approximately $0.1 and a corresponding increase in goodwill. As this adjustment did not have a significant impact on the consolidated statement of income, balance sheets or cash flows, the financial statements have not been retrospectively adjusted.
	Each of the acquisitions was accounted for using the acquisition method of accounting, whereby their results of operations are included in the financial statements from the date of acquisition. The respective purchase prices were allocated to acquired assets and liabilities based on their estimated fair values at the date of acquisition, and any excess was allocated to goodwill. Certain estimated values for the Hearthside and PNC acquisitions, including goodwill, intangible assets and deferred taxes, are not yet finalized pending the final settlement of the purchase price and purchase price allocations and are subject to change once additional information is obtained.
	The following unaudited pro forma information presents a summary of the combined results of operations of the Company and the aggregate results of Attune, Hearthside and PNC for the periods presented as if those fiscal 2013 acquisitions had occurred on October 1, 2011, along with certain pro forma adjustments. These pro forma adjustments give effect to the amortization of certain definite-lived intangible assets, adjusted depreciation based upon fair value of assets acquired, interest expense related to the financing of the business combinations, and related income taxes. The following unaudited pro forma information has been prepared for comparative purposes only and is not necessarily indicative of the results of operations as they would have been had the acquisition occurred on the assumed date, nor is it necessarily an indication of future operating results.
		Three Months Ended December 31, 2012
	Pro forma net sales	$	284.2
	Pro forma net earnings available to common stockholders	$	4.9
	Pro forma basic earnings per share	$	0.15
	Pro forma diluted earnings per share	$	0.15

Restructuring_Notes

Restructuring (Notes)	3 Months Ended
	Dec. 31, 2013
Restructuring and Related Activities [Abstract]	'
Restructuring	'
	NOTE 2 — RESTRUCTURING
	In April 2013, the Company announced management’s decision to close its plant located in Modesto, California as part of a cost savings and capacity rationalization effort. The transfer of production capabilities and closure of the plant is expected to be completed by September 2014.
	Amounts related to the plant closure are shown in the following table. Costs are recognized in “Restructuring expense” in the statements of operations with the exception of accelerated depreciation expense which is included in “Cost of Goods Sold.” These expenses are not included in the measure of segment performance for any segment.
		Three Months Ended December 31, 2013		Cumulative Incurred to Date		Remaining Expense Expected to be Incurred
	Employee severance	$	0.5	$	2.6	$	0.9
	Pension curtailment	—		1.7		—
	Accelerated depreciation	2.7		12.3		5.8
		$	3.2	$	16.6	$	6.7
	Liabilities recorded related to restructuring activities and changes therein are as follows:
		30-Sep-13		Costs Incurred and Charged to Expense		Cash Paid			31-Dec-13
	Employee severance	$	2.1	$	0.5	$	(0.8	)	$	1.8

Goodwill

Goodwill	3 Months Ended
	Dec. 31, 2013
Goodwill and Intangible Assets Disclosure [Abstract]	'
Goodwill	'
	NOTE 4 — GOODWILL
	The changes in the carrying amount of goodwill by segment are noted in the following table.
		Post Foods			Attune Foods		Active Nutrition		Total
	Balance, September 30, 2013
	Goodwill (gross)	$	1,794.10		$	75.1	$	48.3	$	1,917.50
	Accumulated impairment losses	(427.8		)	—		—		(427.8		)
	Goodwill (net)	$	1,366.30		$	75.1	$	48.3	$	1,489.70
	Purchase price true-up adjustment	—			—		0.1		0.1
	Currency translation adjustment	(0.2		)	—		—		(0.2		)
	Balance, December 31, 2013
	Goodwill (gross)	$	1,793.90		$	75.1	$	48.4	$	1,917.40
	Accumulated impairment losses	(427.8		)	—		—		(427.8		)
	Goodwill (net)	$	1,366.10		$	75.1	$	48.4	$	1,489.60

Intangible_Assets_net_Intangib

Intangible Assets, net Intangible Assets, net (Notes)	3 Months Ended
	Dec. 31, 2013
Goodwill and Intangible Assets Disclosure [Abstract]	'
Intangible Assets, net	'
	NOTE 5 — INTANGIBLE ASSETS, NET
	Total intangible assets are as follows:
		31-Dec-13							30-Sep-13
		Carrying		Accumulated Amortization			Net		Carrying		Accumulated Amortization			Net
		Amount					Amount		Amount					Amount
	Subject to amortization:
	Customer relationships	$	258.6	$	(44.3	)	$	214.3	$	258.6	$	(41.0	)	$	217.6
	Trademarks/brands	161.5		(27.8		)	133.7		161.5		(25.8		)	135.7
	Other intangible assets	4.7		(0.7		)	4		4.7		(0.3		)	4.4
		$	424.8	$	(72.8	)	$	352	$	424.8	$	(67.1	)	$	357.7
	Not subject to amortization:
	Trademarks/brands	540.7		—			540.7		540.7		—			540.7
		$	965.5	$	(72.8	)	$	892.7	$	965.5	$	(67.1	)	$	898.4

Earnings_per_Share

Earnings per Share	3 Months Ended
	Dec. 31, 2013
Earnings Per Share [Abstract]	'
Earnings per Share	'
	NOTE 6 — EARNINGS PER SHARE
	Basic earnings per share is based on the average number of common shares outstanding during the period. Diluted earnings per share is based on the average number of shares used for the basic earnings per share calculation, adjusted for the dilutive effect of stock options, stock appreciation rights and restricted stock equivalents using the “treasury stock” method. The impact of potentially dilutive convertible preferred stock is calculated using the “if-converted” method.
	The following table sets forth the computation of basic and diluted earnings per share for the three months ended December 31, 2013 and 2012, respectively.
		Three Months Ended December 31,
		2013			2012
	Net (loss) earnings	$	(2.4	)	$	7.6
	Preferred stock dividends	(2.6		)	—
	Net (loss) earnings available to common stockholders	$	(5.0	)	$	7.6
	Weighted-average shares for basic earnings per share	32.7			32.6
	Effect of dilutive securities:
	Stock appreciation rights	—			0.1
	Total dilutive securities	—			0.1
	Weighted-average shares for diluted earnings per share	32.7			32.7
	Basic (loss) earnings per common share	$	(0.15	)	$	0.23
	Diluted (loss) earnings per common share	$	(0.15	)	$	0.23
	For the three months ended December 31, 2013 and 2012, weighted-average shares for diluted (loss) earnings per common share excludes 3.8 million and 2.2 million equity awards, respectively, and for the quarter ended December 31, 2013 excludes 10.7 million shares related to the potential conversion of the Company’s convertible preferred stock (see Note 11) as they were anti-dilutive.

Inventories_Notes

Inventories (Notes)	3 Months Ended
	Dec. 31, 2013
Inventory [Abstract]	'
Inventory Disclosure [Text Block]	'
	NOTE 7 — INVENTORIES
		31-Dec-13		30-Sep-13
	Raw materials and supplies	$	33.1	$	30.3
	Finished products	87.7		91.6
		$	120.8	$	121.9

Property_net_Notes

Property, net (Notes)	3 Months Ended
	Dec. 31, 2013
Property, Plant and Equipment [Line Items]	'
Property, Plant and Equipment Disclosure [Text Block]	'
	NOTE 8 — PROPERTY, NET
		31-Dec-13			30-Sep-13
	Property, at cost	$	653.7		$	640.5
	Accumulated depreciation	(266.0		)	(252.0		)
		$	387.7		$	388.5

Derivative_Financial_Instrumen

Derivative Financial Instruments and Hedging	3 Months Ended
	Dec. 31, 2013
Derivative Instruments and Hedging Activities Disclosure [Abstract]	'
Derivative financial instruments and hedging	'
	NOTE 9 — DERIVATIVE FINANCIAL INSTRUMENTS AND HEDGING
	In the ordinary course of business, the Company is exposed to commodity price risks relating to the acquisition of raw materials and supplies, interest rate risks relating to debt, and foreign currency exchange rate risks relating to its foreign subsidiary. The Company utilizes derivative financial instruments, including (but not limited to) futures contracts, option contracts, forward contracts and swaps, to manage certain of these exposures by hedging when it is practical to do so. The Company does not hold or issue financial instruments for speculative or trading purposes.
	The Company maintains options and futures contracts which have been designated as economic hedges of raw materials, fuel and energy purchases. The following tables present the balance sheet location and fair value of the Company’s derivative instruments on a gross and net basis as of December 31, 2013 and September 30, 2013.
			Fair Value of Assets as of December 31, 2013
		Balance Sheet Location	Gross Amounts of Recognized Assets			Gross Amounts Offset in the Condensed Consolidated Balance Sheet			Net Amounts of Assets Presented in the Condensed Consolidated Balance Sheet
	Commodity contracts	Prepaid expenses and other current assets	$	—		$	(0.2	)	$	(0.2	)
	Natural gas and heating oil futures	Prepaid expenses and other current assets	0.6			—			0.6
			$	0.6		$	(0.2	)	$	0.4
			Fair Value of Liabilities as of December 31, 2013
		Balance Sheet Location	Gross Amounts of Recognized Liabilities			Gross Amounts Offset in the Condensed Consolidated Balance Sheet			Net Amounts of Liabilities Presented in the Condensed Consolidated Balance Sheet
	Foreign exchange contracts	Other current liabilities	$	1.3		$	—		$	1.3
			Fair Value of Liabilities as of September 30, 2013
		Balance Sheet Location	Gross Amounts of Recognized Liabilities			Gross Amounts Offset in the Condensed Consolidated Balance Sheet			Net Amounts of Liabilities Presented in the Condensed Consolidated Balance Sheet
	Commodity contracts	Other current liabilities	$	0.1		$	—		$	0.1
	Natural gas and heating oil futures	Other current liabilities	0.1			—			0.1
			$	0.2		$	—		$	0.2
	The following table presents the loss from derivative instruments that were not designated as hedging instruments which were recorded on the Company’s Statements of Operations.
			Amount of Gain (Loss) Recognized in Earnings
			Three Months Ended December 31,
	Derivative Instrument	Location of Gain (Loss) Recognized in Earnings	2013			2012
	Commodity contracts	Cost of goods sold	$	0.2		$	(0.5	)
	Natural gas and heating oil futures	Cost of goods sold	0.7			(0.2		)
	Foreign exchange contracts	Selling, general and administrative expenses	(0.7		)	—

Fair_Value_Measurements

Fair Value Measurements	3 Months Ended
	Dec. 31, 2013
Fair Value Disclosures [Abstract]	'
Fair value measurements	'
	NOTE 10 — FAIR VALUE MEASUREMENTS
	The following table represents Post’s assets and liabilities measured at fair value on a recurring basis and the basis for that measurement according to the levels in the fair value hierarchy in ASC Topic 820:
		31-Dec-13						30-Sep-13
		Total		Level 1		Level 2		Total		Level 1		Level 2
	Assets:
	Deferred compensation investment	$	10	$	10	$	—	$	8.5	$	8.5	$	—
	Derivative assets	0.4		—		0.4		—		—		—
		$	10.4	$	10	$	0.4	$	8.5	$	8.5	$	—
	Liabilities:
	Deferred compensation liabilities	$	16.3	$	—	$	16.3	$	13.4	$	—	$	13.4
	Derivative liabilities	1.3		—		1.3		0.2		—		0.2
		$	17.6	$	—	$	17.6	$	13.6	$	—	$	13.6
	The fair value hierarchy is based on inputs to valuation techniques that are used to measure fair value that are either observable or unobservable. Observable inputs reflect assumptions market participants would use in pricing an asset or liability based on market data obtained from independent sources, while unobservable inputs reflect a reporting entity’s pricing based upon their own market assumptions. The fair value hierarchy consists of three levels:
	Level 1 — Inputs are quoted prices in active markets for identical assets or liabilities.
	Level 2 — Inputs are quoted prices of similar assets or liabilities in an active market, quoted prices for identical or similar assets or liabilities in markets that are not active, inputs other than quoted prices that are observable and market-corroborated inputs which are derived principally from or corroborated by observable market data.
	Level 3 — Inputs are derived from valuation techniques in which one or more significant inputs or value drivers are unobservable.
	The deferred compensation investment is invested primarily in mutual funds and its fair value is measured using the market approach. This investment is in the same funds and purchased in substantially the same amounts as the participants’ selected investment options (excluding Post common stock equivalents), which represent the underlying liabilities to participants in the Company’s deferred compensation plans. Deferred compensation liabilities are recorded at amounts due to participants in cash, based on the fair value of participants’ selected investment options (excluding certain Post common stock equivalents to be distributed in shares) using the market approach. The Company utilizes the income approach to measure fair value for its derivative assets, which include commodity options and futures contracts. The income approach uses pricing models that rely on market observable inputs such as yield curves and forward prices.
	Changes in the fair value of assets and liabilities measured at fair value on a recurring basis are recorded as a component of selling, general and administrative expense, except for derivative instruments which are recorded in cost of goods sold.
	The carrying amounts reported on the consolidated balance sheets for cash and cash equivalents, receivables and accounts payable approximate fair value because of the short maturities of these financial instruments. The fair value of long-term debt as of December 31, 2013 (see Note 12) is approximately $2,012.7 based on quoted market prices for the Company’s senior notes.

Preferred_Stock_Notes

Preferred Stock (Notes)	3 Months Ended
	Dec. 31, 2013
Class of Stock [Line Items]	'
Preferred Stock [Text Block]	'
	NOTE 11 — PREFERRED STOCK
	In February 2013, the Company authorized and issued approximately 2.4 million shares of its 3.75% Series B Cumulative Perpetual Convertible Preferred Stock. The Company received net proceeds of $234.0 after paying offering related fees and expenses of approximately $7.5. The preferred stock has a $0.01 par value per share and a $100.00 liquidation value per share. The preferred stock earns cumulative dividends at a rate of 3.75% per annum payable quarterly on February 15, May 15, August 15 and November 15, beginning on May 15, 2013. The preferred stock is non-voting and ranks senior to our outstanding common stock upon the Company’s dissolution or liquidation. The preferred stock has no maturity date; however, holders of the preferred stock may convert their preferred stock at an initial conversion rate of 2.1192 shares of the Company’s common stock per share of convertible preferred stock, which is equivalent to a conversion price of $47.19 per share of common stock. Additionally, on or after February 15, 2018, the Company will have the option to redeem some or all the preferred stock at a redemption price equal to 100% of the liquidation preference per share, plus accrued and unpaid dividends if the closing sale price of the Company’s common stock has been at least 130% of the conversion price then in effect for at least 20 trading days during any 30 consecutive trading day period.
	In December 2013, the Company authorized and issued approximately 3.0 million shares of its 2.5% Series C Cumulative Perpetual Convertible Preferred Stock. The Company also granted the initial purchasers of the preferred stock a 30-day option to purchase up to an additional 450,000 shares of preferred stock (see Note 17). The Company received net proceeds of $290.8 after paying offering related fees and expenses of approximately $9.2. The preferred stock has a $0.01 par value per share and a $100.00 liquidation value per share. The preferred stock earns cumulative dividends at a rate of 2.5% per annum payable quarterly on February 15, May 15, August 15 and November 15, beginning on February 15, 2014. The preferred stock is non-voting and ranks senior to our outstanding common stock upon the Company’s dissolution or liquidation. The preferred stock has no maturity date; however, holders of the preferred stock may convert their preferred stock at an initial conversion rate of 1.8477 shares of the Company’s common stock per share of convertible preferred stock, which is equivalent to a conversion price of $54.12 per share of common stock. Additionally, on or after February 15, 2019, the Company will have the option to redeem some or all the preferred stock at a redemption price equal to 100% of the liquidation preference per share, plus accrued and unpaid dividends if the closing sale price of the Company’s common stock has been at least 150% of the conversion price then in effect for at least 20 trading days during any 30 consecutive trading day period.

Long_Term_Debt_Long_Term_Debt_

Long Term Debt Long Term Debt (Notes)	3 Months Ended
	Dec. 31, 2013
Debt Disclosure [Abstract]	'
Long-Term Debt	'
	NOTE 12 — LONG TERM DEBT
	Long-term debt as of the dates indicated consists of the following:
		31-Dec-13		September 30, 2013
	7.375% Senior Notes maturing February 2022	$	1,375.00	$	1,375.00
	6.75% Senior Notes maturing December 2021	525		—
		$	1,900.00	$	1,375.00
	Plus: Unamortized premium	32.9		33.6
	Total long-term debt	$	1,932.90	$	1,408.60
	On November 18, 2013, the Company issued $525.0 principal value of 6.75% senior notes due in December 2021. The 6.75% senior notes were issued at par and the Company received $516.2 after paying investment banking and other fees of $8.8 which will be deferred and amortized to interest expense over the term of the notes.
	The 7.375% senior notes and the 6.75% senior notes are fully and unconditionally guaranteed, jointly and severally, on a senior unsecured basis by each of our existing and future domestic subsidiaries (other than immaterial subsidiaries or receivables finance subsidiaries). Our foreign subsidiaries do not guarantee the senior notes. These guarantees are subject to release in limited circumstances (only upon the occurrence of certain customary conditions).

Pension_and_Other_Postretireme

Pension and Other Postretirement Benefits	3 Months Ended
	Dec. 31, 2013
Pension and Other Postretirement Benefit Expense [Abstract]	'
Pension and other postretirement benefits	'
	NOTE 13 — PENSION AND OTHER POSTRETIREMENT BENEFITS
	Certain of the Company’s employees are eligible to participate in the Company’s qualified and supplemental noncontributory defined benefit pension plans and other postretirement benefit plans (partially subsidized retiree health and life insurance) or separate plans for Post Foods Canada Inc. Amounts for the Canadian plans are included in these disclosures and are not disclosed separately because they do not constitute a significant portion of the combined amounts.
	The following tables provide the components of net periodic benefit cost for the plans.
		Pension Benefits
		Three Months Ended December 31,
		2013			2012
	Components of net periodic benefit cost
	Service cost	$	0.9		$	1.1
	Interest cost	0.5			0.4
	Expected return on plan assets	(0.5		)	(0.4		)
	Recognized net actuarial loss	0.2			0.2
	Recognized prior service cost	0.1			0.1
	Net periodic benefit cost	$	1.2		$	1.4
		Other Benefits
		Three Months Ended December 31,
		2013			2012
	Components of net periodic benefit cost
	Service cost	$	0.5		$	0.6
	Interest cost	1.1			1
	Recognized net actuarial loss	0.1			0.4
	Recognized prior service credit	(0.6		)	(0.3		)
	Net periodic benefit cost	$	1.1		$	1.7

Transaction_with_Former_Owner

Transaction with Former Owner	3 Months Ended
	Dec. 31, 2013
Related Party Transactions [Abstract]	'
Related Party Transactions	'
	NOTE 14 — TRANSACTIONS WITH FORMER OWNER
	Prior to Post’s legal separation from Ralcorp Holdings, Inc. (“Ralcorp”) on February 3, 2012 (the “Spin-Off”), Post operated under Ralcorp’s centralized cash management system, Post’s cash requirements were provided directly by Ralcorp, and cash generated by Post was generally remitted directly to Ralcorp. Transaction systems (e.g. payroll, employee benefits and accounts payable) used to record and account for cash disbursements were generally provided by Ralcorp. Ralcorp also provided centralized demand planning, order management, billing, credit and collection services to Post. Transaction systems (e.g. revenues, accounts receivable and cash application) used to record and account for cash receipts were generally provided by centralized Ralcorp organizations. These Ralcorp systems were generally designed to track assets/liabilities and receipts/payments on a business specific basis. After the Spin-Off, Ralcorp continues to provide certain of these services to Post under a transition services agreement (“TSA”) between the companies. TSA charges were $0.4 and $1.6, for the three months ended December 31, 2013 and 2012, respectively, and were reported in “Selling, general and administrative expenses.”
	Post produces certain products for sale to Ralcorp. For periods subsequent to the Spin-Off, these transactions were based upon pricing governed by the TSA. Net sales related to those transactions were $3.7 and $4.0 in the three months ended December 31, 2013 and 2012, respectively.
	In connection with the Spin-Off, the Company entered into a series of agreements with Ralcorp which are intended to govern the relationship between the Company and Ralcorp and to facilitate an orderly separation of the Company from Ralcorp. These agreements include a Separation and Distribution Agreement, Tax Allocation Agreement and the TSA, among others. Additionally, the Company has agreed to indemnify Ralcorp for income taxes incurred if the Company violates certain provisions of the IRS private letter ruling obtained by Ralcorp. Under certain of these agreements, the Company will incur expenses payable to Ralcorp in connection with certain administrative services provided for varying lengths of time. The Company incurred separation related costs of $0.2 and $2.8 during the three months ended December 31, 2013 and 2012, respectively. These separation related costs incurred were primarily related to third party professional service fees to effect the Spin-Off and professional service fees and duplicative costs incurred by Post to establish stand-alone processes and systems for activities performed by Ralcorp under the TSA. These costs were reported as a component of “Selling, general and administrative expenses.”

Segment_Information_Segment_In

Segment Information Segment Information	3 Months Ended
	Dec. 31, 2013
Segment Reporting [Abstract]	'
Segment Reporting Disclosure [Text Block]	'
	NOTE 15 — SEGMENTS
	Management evaluates each segment’s performance based on its segment profit, which is its operating profit before impairment of intangible assets, accelerated depreciation on plant closures, restructuring expenses, and other unallocated corporate income and expenses. For the three months ended December 31, 2013, the Company has changed its methodology for allocating certain Corporate costs to segment profit. Accordingly, segment profit for the three months ended December 31, 2012 has been adjusted to align with current year presentation. The following tables present information about the Company’s operating segments, which are also its reportable segments, including corresponding amounts for the prior year.
				Three Months Ended December 31,
				2013			2012
	Net Sales
		Post Foods		$	236.9		$	236.9
		Attune Foods		23.2			—
		Active Nutrition		37.2			—
		Eliminations		(0.3		)	—
			Total	$	297		$	236.9
	Segment Profit
		Post Foods		$	46.5		$	47
		Attune Foods		2.6			—
		Active Nutrition		4.2			—
			Total segment profit	53.3			47
	General corporate expenses and other			24.9			16.7
	Accelerated depreciation on plant closure			2.7			—
	Restructuring expenses			0.5			—
	Interest expense			29			19.2
	(Loss) earnings before income taxes			$	(3.8	)	$	11.1
	Depreciation and amortization
		Post Foods		$	13.2		$	15
		Attune Foods		1.8			—
		Active Nutrition		1.6			—
			Total segment depreciation and amortization	16.6			15
		Accelerated depreciation on plant closure		2.7			—
		Corporate		1.8			1.2
			Total	$	21.1		$	16.2
				31-Dec-13			30-Sep-13
	Assets
		Post Foods		$	2,598.50		$	2,614.90
		Attune Foods		170.3			172
		Active Nutrition		199.2			198
		Corporate		1,321.10			488.9
			Total	$	4,289.10		$	3,473.80

Guarantor_Financials

Guarantor Financials	3 Months Ended
	Dec. 31, 2013
Schedule Of Condensed Financial Statements [Abstract]	'
Guarantor Financials	'
	NOTE 16 — CONDENSED FINANCIAL STATEMENTS OF GUARANTORS
	On February 3, 2012, the Company issued the 7.375% senior notes due February 2022 in an aggregate principal amount of $775.0 to Ralcorp pursuant to a contribution agreement in connection with the internal reorganization. The aggregate principal amount of the 7.375% senior notes was increased to a total of $1,375.0 by subsequent issuances completed on October 25, 2012 and July 18, 2013. The 7.375% senior notes were issued pursuant to an indenture dated as of February 3, 2012 among the Company, Post Foods, LLC, as guarantor, and Wells Fargo Bank, National Association, as trustee. Pursuant to a first supplemental indenture dated as of May 28, 2013, Attune Foods, LLC became a guarantor under the indenture. Pursuant to a second supplemental indenture dated as of September 3, 2013, PNC and its subsidiary became guarantors under the indenture.
	On November 18, 2013, the Company issued 6.75% senior notes due December 2021 in an aggregate principal amount of $525.0 to certain qualified institutional buyers. The 6.75% senior notes were issued pursuant to an indenture dated as of November 18, 2013, among the Company, Post Foods, LLC, Attune Foods, LLC and PNC and its subsidiary, as guarantors and Wells Fargo Bank National Association, as trustee.
	The 7.375% senior notes and the 6.75% senior notes are fully and unconditionally guaranteed, jointly and severally, on a senior unsecured basis by each of our existing and future domestic subsidiaries, the “Guarantors.” Our foreign subsidiaries, the “Non-Guarantors,” do not guarantee the senior notes. These guarantees are subject to release in limited circumstances (only upon the occurrence of certain customary conditions).
	POST HOLDINGS, INC.
	CONDENSED CONSOLIDATING STATEMENTS OF OPERATIONS (Unaudited)
		Three Months Ended December 31, 2013
		Parent						Non-
		Company			Guarantors			Guarantors			Eliminations			Total
	Net Sales	$	—		$	284.8		$	18.8		$	(6.6	)	$	297
	Cost of goods sold	—			174.1			15			(6.6		)	182.5
	Gross Profit	—			110.7			3.8			—			114.5
	Selling, general and administrative expenses	4.5			74.6			3.9			—			83
	Amortization of intangible assets	—			5.7			—			—			5.7
	Restructuring expense	—			0.5			—			—			0.5
	Other operating expenses, net	—			0.1			—			—			0.1
	Operating (Loss) Profit	(4.5		)	29.8			(0.1		)	—			25.2
	Interest expense	29			—			—			—			29
	(Loss) Earnings before Income Taxes	(33.5		)	29.8			(0.1		)	—			(3.8		)
	Income tax (benefit) expense	(11.9		)	10.5			—			—			(1.4		)
	Net (Loss) Earnings before Equity in Subsidiaries	(21.6		)	19.3			(0.1		)	—			(2.4		)
	Equity earnings in subsidiary	19.2			—			—			(19.2		)	—
	Net Earnings (Loss)	$	(2.4	)	$	19.3		$	(0.1	)	$	(19.2	)	$	(2.4	)
	Total Comprehensive (Loss) Income	$	(4.7	)	$	19.2		$	(2.3	)	$	(16.9	)	$	(4.7	)
		Three Months Ended December 31, 2012
		Parent						Non-
		Company			Guarantors			Guarantors			Eliminations			Total
	Net Sales	$	—		$	223.3		$	20.9		$	(7.3	)	$	236.9
	Cost of goods sold	—			122.2			16.3			(7.3		)	131.2
	Gross Profit	—			101.1			4.6			—			105.7
	Selling, general and administrative expenses	2.5			65.4			4.2			—			72.1
	Amortization of intangible assets	—			3.2			—			—			3.2
	Other operating expenses, net	—			0.1			—			—			0.1
	Operating (Loss) Profit	(2.5		)	32.4			0.4			—			30.3
	Interest expense	19.2			—			—			—			19.2
	(Loss) Earnings before Income Taxes	(21.7		)	32.4			0.4			—			11.1
	Income tax (benefit) expense	(7.0		)	10.4			0.1			—			3.5
	Net (Loss) Earnings before Equity in Subsidiaries	(14.7		)	22			0.3			—			7.6
	Equity earnings in subsidiary	22.3			—			—			(22.3		)	—
	Net Earnings	$	7.6		$	22		$	0.3		$	(22.3	)	$	7.6
	Total Comprehensive Income (Loss)	$	7.1		$	22.2		$	(0.4	)	$	(21.8	)	$	7.1
	POST HOLDINGS, INC.
	CONDENSED CONSOLIDATING BALANCE SHEETS (Unaudited)
		31-Dec-13
		Parent						Non-
		Company			Guarantors			Guarantors			Eliminations			Total
	ASSETS
	Current Assets
	Cash and cash equivalents	$	877.9		$	0.9		$	8.6		$	(2.5	)	$	884.9
	Restricted cash	1.1			—			—			—			1.1
	Receivables, net	—			78.3			9.8			(3.2		)	84.9
	Inventories	—			116.3			4.5			—			120.8
	Deferred income taxes	12.1			—			—			—			12.1
	Prepaid expenses and other current assets	3.9			6.6			0.3			—			10.8
	Total Current Assets	895			202.1			23.2			(5.7		)	1,114.60
	Property, net	—			344.4			43.3			—			387.7
	Goodwill	—			1,483.40			6.2			—			1,489.60
	Other intangible assets, net	—			892.7			—			—			892.7
	Intercompany receivable	394.8			—			—			(394.8		)	—
	Investment in subsidiaries	2,396.30			—			—			(2,396.3		)	—
	Cash advance for acquisitions	366.2			—			—			—			366.2
	Deferred income taxes	—			—			2.2			—			2.2
	Other assets	31.5			3.9			0.7			—			36.1
Total Assets	$	4,083.80		$	2,926.50		$	75.6		$	(2,796.8	)	$	4,289.10
LIABILITIES AND STOCKHOLDERS’ EQUITY
Current Liabilities
Accounts payable	$	0.6		$	57.7		$	4.2		$	(5.7	)	$	56.8
Other current liabilities	49.7			39.6			5			—			94.3
Total Current Liabilities	50.3			97.3			9.2			(5.7		)	151.1
Long-term debt	1,932.90			—			—			—			1,932.90
Intercompany payable	—			394.5			0.3			(394.8		)	—
Deferred income taxes	302.4			—			—			—			302.4
Other liabilities	12.5			97.3			7.2			—			117
Total Liabilities	2,298.10			589.1			16.7			(400.5		)	2,503.40
Total Stockholders’ Equity	1,785.70			2,337.40			58.9			(2,396.3		)	1,785.70
Total Liabilities and Stockholders’ Equity	$	4,083.80		$	2,926.50		$	75.6		$	(2,796.8	)	$	4,289.10
	30-Sep-13
	Parent						Non-
	Company			Guarantors			Guarantors			Eliminations			Total
ASSETS
Current Assets
Cash and cash equivalents	$	391.4		$	4.1		$	8.2		$	(1.7	)	$	402
Restricted cash	38.1			—			—			—			38.1
Receivables, net	0.3			75.9			10.9			(3.9		)	83.2
Inventories	—			115.9			6			—			121.9
Deferred income taxes	11.8			—			0.1			—			11.9
Prepaid expenses and other current assets	3.2			7.4			0.4			—			11
Total Current Assets	444.8			203.3			25.6			(5.6		)	668.1
Property, net	—			342.4			46.1			—			388.5
Goodwill	—			1,483.30			6.4			—			1,489.70
Other intangible assets, net	—			898.4			—			—			898.4
Intercompany receivable	391.9			—			—			(391.9		)	—
Investment in subsidiaries	2,384.00			—			—			(2,384.0		)	—
Deferred income taxes	—			—			2.4			—			2.4
Other assets	24			2.7			—			—			26.7
Total Assets	$	3,244.70		$	2,930.10		$	80.5		$	(2,781.5	)	$	3,473.80
LIABILITIES AND STOCKHOLDERS’ EQUITY
Current Liabilities
Accounts payable	$	0.5		$	76.9		$	5.3		$	(5.6	)	$	77.1
Other current liabilities	18.5			43.8			6.6			—			68.9
Total Current Liabilities	19			120.7			11.9			(5.6		)	146
Long-term debt	1,408.60			—			—			—			1,408.60
Intercompany payable	—			391.7			0.2			(391.9		)	—
Deferred income taxes	304.3			—			—			—			304.3
Other liabilities	14.2			94.9			7.2			—			116.3
Total Liabilities	1,746.10			607.3			19.3			(397.5		)	1,975.20
Total Stockholders’ Equity	1,498.60			2,322.80			61.2			(2,384.0		)	1,498.60
Total Liabilities and Stockholders’ Equity	$	3,244.70		$	2,930.10		$	80.5		$	(2,781.5	)	$	3,473.80
POST HOLDINGS, INC.
CONDENSED CONSOLIDATING STATEMENTS OF CASH FLOWS (Unaudited)
	Three Months Ended December 31, 2013
	Parent						Non-
	Company			Guarantors			Guarantors			Eliminations			Total
Net Cash Provided by Operating Activities	$	11.7		$	26.9		$	1		$	(14.7	)	$	24.9
Cash Flows from Investing Activities
Cash advance for acquisition	(366.2		)	—			—			—			(366.2		)
Additions to property	—			(16.2		)	(0.3		)	—			(16.5		)
Restricted cash	37			—			—			—			37
Net Cash Used in Investing Activities	(329.2		)	(16.2		)	(0.3		)	—			(345.7		)
Cash Flows from Financing Activities
Proceeds from issuance of senior notes	525			—			—			—			525
Proceeds from issuance of preferred stock	290.8			—			—			—			290.8
Repayments of long-term debt	—			—			—			—			—
Payment of dividend	(2.3		)	—			—			—			(2.3		)
Payments of debt issuance costs	(8.8		)	—			—			—			(8.8		)
Other	(0.1		)	—			—			—			(0.1		)
Payments for equity distributions	—			(13.9		)	—			13.9			—
Net Cash Provided (Used) by Financing Activities	804.6			(13.9		)	—			13.9			804.6
Effect of exchange rate changes on cash and cash equivalents	(0.6		)	—			(0.3		)	—			(0.9		)
Net Increase (Decrease) in Cash and Cash Equivalents	486.5			(3.2		)	0.4			(0.8		)	482.9
Cash and Cash Equivalents, Beginning of Year	391.4			4.1			8.2			(1.7		)	402
Cash and Cash Equivalents, End of Period	$	877.9		$	0.9		$	8.6		$	(2.5	)	$	884.9
	Three Months Ended December 31, 2012
	Parent						Non-
	Company			Guarantors			Guarantors			Eliminations			Total
Net Cash Provided by Operating Activities	$	17.5		$	6.3		$	(0.2	)	$	—		$	23.6
Cash Flows from Investing Activities
Business acquisitions	—			(9.2		)	—			—			(9.2		)
Additions to property	—			(4.8		)	(0.2		)	—			(5.0		)
Payment for equity contributions	(8.1		)	—			—			8.1			—
Net Cash Provided by (Used in) Investing Activities	(8.1		)	(14.0		)	(0.2		)	8.1			(14.2		)
Cash Flows from Financing Activities
Proceeds from issuance of senior notes	250			—			—			—			250
Repayments of long-term debt	(2.2		)	—			—			—			(2.2		)
Payments of debt issuance costs	(4.6		)	—			—			—			(4.6		)
Other, net	0.2			—			—			—			0.2
Proceeds from equity contributions	—			8.1			—			(8.1		)	—
Net Cash Provided (Used) by Financing Activities	243.4			8.1			—			(8.1		)	243.4
Effect of Exchange Rate Changes on Cash	—			—			(0.1		)	—			(0.1		)
Net Increase in Cash and Cash Equivalents	252.8			0.4			(0.5		)	—			252.7
Cash and Cash Equivalents, Beginning of Year	49.7			2.2			6.3			—			58.2
Cash and Cash Equivalents, End of Period	$	302.5		$	2.6		$	5.8		$	—		$	310.9

Subsequent_Event_Notes

Subsequent Event (Notes)	3 Months Ended
	Dec. 31, 2013
Subsequent Events [Abstract]	'
Subsequent Events [Text Block]	'
	NOTE 17 — SUBSEQUENT EVENTS
	Acquisition of Dakota Growers Pasta Company, Inc.
	On January 1, 2014, Post completed its previously announced acquisition from Viterra Inc. of all of the stock of Agricore United Holdings Inc. (“Agricore”). Agricore is the parent company of Dakota Growers Pasta Company, Inc., a manufacturer of dry pasta for retail and institutional markets. The purchase price for the transaction was $370.0 in cash, subject to a working capital adjustment, which resulted in a payment at closing of approximately $366.2, and was funded through Post’s existing cash resources.
	Preferred Stock Dividend
	On January 9, 2014, the Company’s Board of Directors declared a quarterly dividend of $0.9375 per share, representing payment for the dividend period from the date of November 15, 2013 to February 14, 2014, on the Company’s 3.75% Series B Cumulative Perpetual Convertible Preferred Stock. The Board of Directors also declared a quarterly dividend of $0.42361 per share, representing a pro-rata payment for the partial dividend period from the issue date of December 16, 2013 to February 14, 2014, on the Company’s 2.5% Series C Cumulative Perpetual Convertible Preferred Stock. Both dividends will be paid on February 15, 2014 to preferred shareholders as of February 1, 2014.
	Preferred Stock Issuance
	On January 14, 2014, the Company closed an issuance of an additional 200,000 shares of its 2.5% Series C Cumulative Perpetual Convertible Preferred Stock pursuant to the partial exercise by the initial purchasers of their option to purchase additional shares of preferred stock. The net proceeds to the Company from the exercise of the option, after deducting the initial purchasers’ discounts and commissions, were approximately $19.4.
	Revolving Credit Facility
	On January 29, 2014, the Company entered into a $300.0 million revolving credit facility. The Company intends to use the proceeds of loans under the Credit Agreement for general corporate purposes, which may include, among other things, financing acquisitions, working capital and capital expenditures. The revolving credit facility must be repaid on or before January 29, 2019. No amount was drawn against the facility at execution.
	Acquisition of Golden Boy Foods Ltd.
	On February 1, 2014, Post completed its previously announced acquisition of Golden Boy Foods Ltd., a manufacturer of private label peanut and other nut butters, as well as dried fruits and snacking nuts. The purchase price for the transaction was CAD$320.0 in cash, subject to a working capital adjustment, which resulted in a payment at closing of approximately CAD$321.1, and was funded through Post’s existing cash resources.
	Acquisition of Dymatize Enterprises, LLC
	On February 1, 2014, Post completed its previously announced acquisition of Dymatize Enterprises, LLC, a manufacturer and marketer of premium protein powders, bars and nutritional supplements. The purchase price for the transaction was $380.0 in cash, subject to a working capital adjustment, which resulted in a payment at closing of approximately $392.5, and was funded through Post’s existing cash resources.
	Acquisition of PowerBar and Musashi
	In a release dated February 3, 2014, Post announced it has agreed to acquire the PowerBar and Musashi brands and related worldwide assets from Nestlé S.A in a transaction expected to be completed in Post’s fiscal third quarter, subject to customary closing conditions. Post has agreed to pay $150.0 for the brands, subject to working capital and other adjustments.

Business_Combinations_Tables

Business Combinations (Tables)	3 Months Ended
	Dec. 31, 2013
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]	'
Business Acquisition, Pro Forma Information [Table Text Block]	'
		Three Months Ended December 31, 2012
	Pro forma net sales	$	284.2
	Pro forma net earnings available to common stockholders	$	4.9
	Pro forma basic earnings per share	$	0.15
	Pro forma diluted earnings per share	$	0.15

Restructuring_Tables

Restructuring (Tables)	3 Months Ended
	Dec. 31, 2013
Restructuring and Related Activities [Abstract]	'
Schedule of Restructuring and Related Costs	'
		Three Months Ended December 31, 2013		Cumulative Incurred to Date		Remaining Expense Expected to be Incurred
	Employee severance	$	0.5	$	2.6	$	0.9
	Pension curtailment	—		1.7		—
	Accelerated depreciation	2.7		12.3		5.8
		$	3.2	$	16.6	$	6.7
	Liabilities recorded related to restructuring activities and changes therein are as follows:
		30-Sep-13		Costs Incurred and Charged to Expense		Cash Paid			31-Dec-13
	Employee severance	$	2.1	$	0.5	$	(0.8	)	$	1.8

Goodwill_Tables

Goodwill (Tables)	3 Months Ended
	Dec. 31, 2013
Goodwill and Intangible Assets Disclosure [Abstract]	'
Changes in carrying amount of goodwill	'
	The changes in the carrying amount of goodwill by segment are noted in the following table.
		Post Foods			Attune Foods		Active Nutrition		Total
	Balance, September 30, 2013
	Goodwill (gross)	$	1,794.10		$	75.1	$	48.3	$	1,917.50
	Accumulated impairment losses	(427.8		)	—		—		(427.8		)
	Goodwill (net)	$	1,366.30		$	75.1	$	48.3	$	1,489.70
	Purchase price true-up adjustment	—			—		0.1		0.1
	Currency translation adjustment	(0.2		)	—		—		(0.2		)
	Balance, December 31, 2013
	Goodwill (gross)	$	1,793.90		$	75.1	$	48.4	$	1,917.40
	Accumulated impairment losses	(427.8		)	—		—		(427.8		)
	Goodwill (net)	$	1,366.10		$	75.1	$	48.4	$	1,489.60

Intangible_Assets_net_Intangib1

Intangible Assets, net Intangible Assets, net (Tables)	3 Months Ended
	Dec. 31, 2013
Goodwill and Intangible Assets Disclosure [Abstract]	'
Total intangible assets	'
		31-Dec-13							30-Sep-13
		Carrying		Accumulated Amortization			Net		Carrying		Accumulated Amortization			Net
		Amount					Amount		Amount					Amount
	Subject to amortization:
	Customer relationships	$	258.6	$	(44.3	)	$	214.3	$	258.6	$	(41.0	)	$	217.6
	Trademarks/brands	161.5		(27.8		)	133.7		161.5		(25.8		)	135.7
	Other intangible assets	4.7		(0.7		)	4		4.7		(0.3		)	4.4
		$	424.8	$	(72.8	)	$	352	$	424.8	$	(67.1	)	$	357.7
	Not subject to amortization:
	Trademarks/brands	540.7		—			540.7		540.7		—			540.7
		$	965.5	$	(72.8	)	$	892.7	$	965.5	$	(67.1	)	$	898.4

Earnings_per_Share_Tables

Earnings per Share (Tables)	3 Months Ended
	Dec. 31, 2013
Earnings Per Share [Abstract]	'
Computation of basic and diluted earnings per share	'
	The following table sets forth the computation of basic and diluted earnings per share for the three months ended December 31, 2013 and 2012, respectively.
		Three Months Ended December 31,
		2013			2012
	Net (loss) earnings	$	(2.4	)	$	7.6
	Preferred stock dividends	(2.6		)	—
	Net (loss) earnings available to common stockholders	$	(5.0	)	$	7.6
	Weighted-average shares for basic earnings per share	32.7			32.6
	Effect of dilutive securities:
	Stock appreciation rights	—			0.1
	Total dilutive securities	—			0.1
	Weighted-average shares for diluted earnings per share	32.7			32.7
	Basic (loss) earnings per common share	$	(0.15	)	$	0.23
	Diluted (loss) earnings per common share	$	(0.15	)	$	0.23

Inventories_Tables

Inventories (Tables)	3 Months Ended
	Dec. 31, 2013
Inventory [Line Items]	'
Schedule of Inventory, Current [Table Text Block]	'
		31-Dec-13		30-Sep-13
	Raw materials and supplies	$	33.1	$	30.3
	Finished products	87.7		91.6
		$	120.8	$	121.9

Property_net_Tables

Property, net (Tables)	3 Months Ended
	Dec. 31, 2013
Property, Plant and Equipment [Abstract]	'
Property, Plant and Equipment [Table Text Block]	'
		31-Dec-13			30-Sep-13
	Property, at cost	$	653.7		$	640.5
	Accumulated depreciation	(266.0		)	(252.0		)
		$	387.7		$	388.5

Derivative_Financial_Instrumen1

Derivative Financial Instruments and Hedging Gain (Loss) Recognized in Earnings (Tables)	3 Months Ended
	Dec. 31, 2013
Derivatives, Fair Value [Line Items]	'
Schedule of Derivative Instruments in Statement of Financial Position	'
			Fair Value of Assets as of December 31, 2013
		Balance Sheet Location	Gross Amounts of Recognized Assets			Gross Amounts Offset in the Condensed Consolidated Balance Sheet			Net Amounts of Assets Presented in the Condensed Consolidated Balance Sheet
	Commodity contracts	Prepaid expenses and other current assets	$	—		$	(0.2	)	$	(0.2	)
	Natural gas and heating oil futures	Prepaid expenses and other current assets	0.6			—			0.6
			$	0.6		$	(0.2	)	$	0.4
			Fair Value of Liabilities as of December 31, 2013
		Balance Sheet Location	Gross Amounts of Recognized Liabilities			Gross Amounts Offset in the Condensed Consolidated Balance Sheet			Net Amounts of Liabilities Presented in the Condensed Consolidated Balance Sheet
	Foreign exchange contracts	Other current liabilities	$	1.3		$	—		$	1.3
			Fair Value of Liabilities as of September 30, 2013
		Balance Sheet Location	Gross Amounts of Recognized Liabilities			Gross Amounts Offset in the Condensed Consolidated Balance Sheet			Net Amounts of Liabilities Presented in the Condensed Consolidated Balance Sheet
	Commodity contracts	Other current liabilities	$	0.1		$	—		$	0.1
	Natural gas and heating oil futures	Other current liabilities	0.1			—			0.1
			$	0.2		$	—		$	0.2
Schedule of Derivative Instruments, Gain (Loss) in Statement of Financial Performance	'
			Amount of Gain (Loss) Recognized in Earnings
			Three Months Ended December 31,
	Derivative Instrument	Location of Gain (Loss) Recognized in Earnings	2013			2012
	Commodity contracts	Cost of goods sold	$	0.2		$	(0.5	)
	Natural gas and heating oil futures	Cost of goods sold	0.7			(0.2		)
	Foreign exchange contracts	Selling, general and administrative expenses	(0.7		)	—

Fair_Value_Measurements_Tables

Fair Value Measurements (Tables)	3 Months Ended
	Dec. 31, 2013
Fair Value Disclosures [Abstract]	'
Assets and liabilities measured at fair value	'
	The following table represents Post’s assets and liabilities measured at fair value on a recurring basis and the basis for that measurement according to the levels in the fair value hierarchy in ASC Topic 820:
		31-Dec-13						30-Sep-13
		Total		Level 1		Level 2		Total		Level 1		Level 2
	Assets:
	Deferred compensation investment	$	10	$	10	$	—	$	8.5	$	8.5	$	—
	Derivative assets	0.4		—		0.4		—		—		—
		$	10.4	$	10	$	0.4	$	8.5	$	8.5	$	—
	Liabilities:
	Deferred compensation liabilities	$	16.3	$	—	$	16.3	$	13.4	$	—	$	13.4
	Derivative liabilities	1.3		—		1.3		0.2		—		0.2
		$	17.6	$	—	$	17.6	$	13.6	$	—	$	13.6

Long_Term_Debt_Tables

Long Term Debt (Tables)	3 Months Ended
	Dec. 31, 2013
Debt Disclosure [Abstract]	'
Schedule of Long-term Debt Instruments	'
	Long-term debt as of the dates indicated consists of the following:
		31-Dec-13		September 30, 2013
	7.375% Senior Notes maturing February 2022	$	1,375.00	$	1,375.00
	6.75% Senior Notes maturing December 2021	525		—
		$	1,900.00	$	1,375.00
	Plus: Unamortized premium	32.9		33.6
	Total long-term debt	$	1,932.90	$	1,408.60

Pension_and_Other_Postretireme1

Pension and Other Postretirement Benefits (Tables)	3 Months Ended
	Dec. 31, 2013
Pension and Other Postretirement Benefit Expense [Abstract]	'
Schedule of net benefit costs and assumptions used in calculation	'
	The following tables provide the components of net periodic benefit cost for the plans.
		Pension Benefits
		Three Months Ended December 31,
		2013			2012
	Components of net periodic benefit cost
	Service cost	$	0.9		$	1.1
	Interest cost	0.5			0.4
	Expected return on plan assets	(0.5		)	(0.4		)
	Recognized net actuarial loss	0.2			0.2
	Recognized prior service cost	0.1			0.1
	Net periodic benefit cost	$	1.2		$	1.4
		Other Benefits
		Three Months Ended December 31,
		2013			2012
	Components of net periodic benefit cost
	Service cost	$	0.5		$	0.6
	Interest cost	1.1			1
	Recognized net actuarial loss	0.1			0.4
	Recognized prior service credit	(0.6		)	(0.3		)
	Net periodic benefit cost	$	1.1		$	1.7

Segment_Information_Segments_T

Segment Information Segments (Tables)	3 Months Ended
	Dec. 31, 2013
Segment Reporting [Abstract]	'
Schedule of Segment Reporting Information, by Segment [Table Text Block]	'
				Three Months Ended December 31,
				2013			2012
	Net Sales
		Post Foods		$	236.9		$	236.9
		Attune Foods		23.2			—
		Active Nutrition		37.2			—
		Eliminations		(0.3		)	—
			Total	$	297		$	236.9
	Segment Profit
		Post Foods		$	46.5		$	47
		Attune Foods		2.6			—
		Active Nutrition		4.2			—
			Total segment profit	53.3			47
	General corporate expenses and other			24.9			16.7
	Accelerated depreciation on plant closure			2.7			—
	Restructuring expenses			0.5			—
	Interest expense			29			19.2
	(Loss) earnings before income taxes			$	(3.8	)	$	11.1
	Depreciation and amortization
		Post Foods		$	13.2		$	15
		Attune Foods		1.8			—
		Active Nutrition		1.6			—
			Total segment depreciation and amortization	16.6			15
		Accelerated depreciation on plant closure		2.7			—
		Corporate		1.8			1.2
			Total	$	21.1		$	16.2
				31-Dec-13			30-Sep-13
	Assets
		Post Foods		$	2,598.50		$	2,614.90
		Attune Foods		170.3			172
		Active Nutrition		199.2			198
		Corporate		1,321.10			488.9
			Total	$	4,289.10		$	3,473.80

Guarantor_Financials_Tables

Guarantor Financials (Tables)	3 Months Ended
	Dec. 31, 2013
Guarantor Balance Sheet [Abstract]	'
Schedule of Condensed Income Statement [Table Text Block]	'
	POST HOLDINGS, INC.
	CONDENSED CONSOLIDATING STATEMENTS OF OPERATIONS (Unaudited)
		Three Months Ended December 31, 2013
		Parent						Non-
		Company			Guarantors			Guarantors			Eliminations			Total
	Net Sales	$	—		$	284.8		$	18.8		$	(6.6	)	$	297
	Cost of goods sold	—			174.1			15			(6.6		)	182.5
	Gross Profit	—			110.7			3.8			—			114.5
	Selling, general and administrative expenses	4.5			74.6			3.9			—			83
	Amortization of intangible assets	—			5.7			—			—			5.7
	Restructuring expense	—			0.5			—			—			0.5
	Other operating expenses, net	—			0.1			—			—			0.1
	Operating (Loss) Profit	(4.5		)	29.8			(0.1		)	—			25.2
	Interest expense	29			—			—			—			29
	(Loss) Earnings before Income Taxes	(33.5		)	29.8			(0.1		)	—			(3.8		)
	Income tax (benefit) expense	(11.9		)	10.5			—			—			(1.4		)
	Net (Loss) Earnings before Equity in Subsidiaries	(21.6		)	19.3			(0.1		)	—			(2.4		)
	Equity earnings in subsidiary	19.2			—			—			(19.2		)	—
	Net Earnings (Loss)	$	(2.4	)	$	19.3		$	(0.1	)	$	(19.2	)	$	(2.4	)
	Total Comprehensive (Loss) Income	$	(4.7	)	$	19.2		$	(2.3	)	$	(16.9	)	$	(4.7	)
		Three Months Ended December 31, 2012
		Parent						Non-
		Company			Guarantors			Guarantors			Eliminations			Total
	Net Sales	$	—		$	223.3		$	20.9		$	(7.3	)	$	236.9
	Cost of goods sold	—			122.2			16.3			(7.3		)	131.2
	Gross Profit	—			101.1			4.6			—			105.7
	Selling, general and administrative expenses	2.5			65.4			4.2			—			72.1
	Amortization of intangible assets	—			3.2			—			—			3.2
	Other operating expenses, net	—			0.1			—			—			0.1
	Operating (Loss) Profit	(2.5		)	32.4			0.4			—			30.3
	Interest expense	19.2			—			—			—			19.2
	(Loss) Earnings before Income Taxes	(21.7		)	32.4			0.4			—			11.1
	Income tax (benefit) expense	(7.0		)	10.4			0.1			—			3.5
	Net (Loss) Earnings before Equity in Subsidiaries	(14.7		)	22			0.3			—			7.6
	Equity earnings in subsidiary	22.3			—			—			(22.3		)	—
	Net Earnings	$	7.6		$	22		$	0.3		$	(22.3	)	$	7.6
	Total Comprehensive Income (Loss)	$	7.1		$	22.2		$	(0.4	)	$	(21.8	)	$	7.1
Schedule of Condensed Balance Sheet [Table Text Block]	'
	POST HOLDINGS, INC.
	CONDENSED CONSOLIDATING BALANCE SHEETS (Unaudited)
		31-Dec-13
		Parent						Non-
		Company			Guarantors			Guarantors			Eliminations			Total
	ASSETS
	Current Assets
	Cash and cash equivalents	$	877.9		$	0.9		$	8.6		$	(2.5	)	$	884.9
	Restricted cash	1.1			—			—			—			1.1
	Receivables, net	—			78.3			9.8			(3.2		)	84.9
	Inventories	—			116.3			4.5			—			120.8
	Deferred income taxes	12.1			—			—			—			12.1
	Prepaid expenses and other current assets	3.9			6.6			0.3			—			10.8
	Total Current Assets	895			202.1			23.2			(5.7		)	1,114.60
	Property, net	—			344.4			43.3			—			387.7
	Goodwill	—			1,483.40			6.2			—			1,489.60
	Other intangible assets, net	—			892.7			—			—			892.7
	Intercompany receivable	394.8			—			—			(394.8		)	—
	Investment in subsidiaries	2,396.30			—			—			(2,396.3		)	—
	Cash advance for acquisitions	366.2			—			—			—			366.2
	Deferred income taxes	—			—			2.2			—			2.2
	Other assets	31.5			3.9			0.7			—			36.1
	Total Assets	$	4,083.80		$	2,926.50		$	75.6		$	(2,796.8	)	$	4,289.10
	LIABILITIES AND STOCKHOLDERS’ EQUITY
	Current Liabilities
	Accounts payable	$	0.6		$	57.7		$	4.2		$	(5.7	)	$	56.8
	Other current liabilities	49.7			39.6			5			—			94.3
	Total Current Liabilities	50.3			97.3			9.2			(5.7		)	151.1
	Long-term debt	1,932.90			—			—			—			1,932.90
	Intercompany payable	—			394.5			0.3			(394.8		)	—
	Deferred income taxes	302.4			—			—			—			302.4
	Other liabilities	12.5			97.3			7.2			—			117
	Total Liabilities	2,298.10			589.1			16.7			(400.5		)	2,503.40
	Total Stockholders’ Equity	1,785.70			2,337.40			58.9			(2,396.3		)	1,785.70
	Total Liabilities and Stockholders’ Equity	$	4,083.80		$	2,926.50		$	75.6		$	(2,796.8	)	$	4,289.10
		30-Sep-13
		Parent						Non-
		Company			Guarantors			Guarantors			Eliminations			Total
	ASSETS
	Current Assets
	Cash and cash equivalents	$	391.4		$	4.1		$	8.2		$	(1.7	)	$	402
	Restricted cash	38.1			—			—			—			38.1
	Receivables, net	0.3			75.9			10.9			(3.9		)	83.2
	Inventories	—			115.9			6			—			121.9
	Deferred income taxes	11.8			—			0.1			—			11.9
	Prepaid expenses and other current assets	3.2			7.4			0.4			—			11
	Total Current Assets	444.8			203.3			25.6			(5.6		)	668.1
	Property, net	—			342.4			46.1			—			388.5
	Goodwill	—			1,483.30			6.4			—			1,489.70
	Other intangible assets, net	—			898.4			—			—			898.4
	Intercompany receivable	391.9			—			—			(391.9		)	—
	Investment in subsidiaries	2,384.00			—			—			(2,384.0		)	—
	Deferred income taxes	—			—			2.4			—			2.4
	Other assets	24			2.7			—			—			26.7
	Total Assets	$	3,244.70		$	2,930.10		$	80.5		$	(2,781.5	)	$	3,473.80
	LIABILITIES AND STOCKHOLDERS’ EQUITY
	Current Liabilities
	Accounts payable	$	0.5		$	76.9		$	5.3		$	(5.6	)	$	77.1
	Other current liabilities	18.5			43.8			6.6			—			68.9
	Total Current Liabilities	19			120.7			11.9			(5.6		)	146
	Long-term debt	1,408.60			—			—			—			1,408.60
	Intercompany payable	—			391.7			0.2			(391.9		)	—
	Deferred income taxes	304.3			—			—			—			304.3
Other liabilities	14.2			94.9			7.2			—			116.3
Total Liabilities	1,746.10			607.3			19.3			(397.5		)	1,975.20
Total Stockholders’ Equity	1,498.60			2,322.80			61.2			(2,384.0		)	1,498.60
Total Liabilities and Stockholders’ Equity	$	3,244.70		$	2,930.10		$	80.5		$	(2,781.5	)	$	3,473.80
Schedule of Condensed Cash Flow Statement [Table Text Block]	'
	POST HOLDINGS, INC.
	CONDENSED CONSOLIDATING STATEMENTS OF CASH FLOWS (Unaudited)
		Three Months Ended December 31, 2013
		Parent						Non-
		Company			Guarantors			Guarantors			Eliminations			Total
	Net Cash Provided by Operating Activities	$	11.7		$	26.9		$	1		$	(14.7	)	$	24.9
	Cash Flows from Investing Activities
	Cash advance for acquisition	(366.2		)	—			—			—			(366.2		)
	Additions to property	—			(16.2		)	(0.3		)	—			(16.5		)
	Restricted cash	37			—			—			—			37
	Net Cash Used in Investing Activities	(329.2		)	(16.2		)	(0.3		)	—			(345.7		)
	Cash Flows from Financing Activities
	Proceeds from issuance of senior notes	525			—			—			—			525
	Proceeds from issuance of preferred stock	290.8			—			—			—			290.8
	Repayments of long-term debt	—			—			—			—			—
	Payment of dividend	(2.3		)	—			—			—			(2.3		)
	Payments of debt issuance costs	(8.8		)	—			—			—			(8.8		)
	Other	(0.1		)	—			—			—			(0.1		)
	Payments for equity distributions	—			(13.9		)	—			13.9			—
	Net Cash Provided (Used) by Financing Activities	804.6			(13.9		)	—			13.9			804.6
	Effect of exchange rate changes on cash and cash equivalents	(0.6		)	—			(0.3		)	—			(0.9		)
	Net Increase (Decrease) in Cash and Cash Equivalents	486.5			(3.2		)	0.4			(0.8		)	482.9
	Cash and Cash Equivalents, Beginning of Year	391.4			4.1			8.2			(1.7		)	402
	Cash and Cash Equivalents, End of Period	$	877.9		$	0.9		$	8.6		$	(2.5	)	$	884.9
		Three Months Ended December 31, 2012
		Parent						Non-
		Company			Guarantors			Guarantors			Eliminations			Total
	Net Cash Provided by Operating Activities	$	17.5		$	6.3		$	(0.2	)	$	—		$	23.6
	Cash Flows from Investing Activities
	Business acquisitions	—			(9.2		)	—			—			(9.2		)
	Additions to property	—			(4.8		)	(0.2		)	—			(5.0		)
	Payment for equity contributions	(8.1		)	—			—			8.1			—
	Net Cash Provided by (Used in) Investing Activities	(8.1		)	(14.0		)	(0.2		)	8.1			(14.2		)
	Cash Flows from Financing Activities
	Proceeds from issuance of senior notes	250			—			—			—			250
	Repayments of long-term debt	(2.2		)	—			—			—			(2.2		)
	Payments of debt issuance costs	(4.6		)	—			—			—			(4.6		)
	Other, net	0.2			—			—			—			0.2
	Proceeds from equity contributions	—			8.1			—			(8.1		)	—
	Net Cash Provided (Used) by Financing Activities	243.4			8.1			—			(8.1		)	243.4
	Effect of Exchange Rate Changes on Cash	—			—			(0.1		)	—			(0.1		)
	Net Increase in Cash and Cash Equivalents	252.8			0.4			(0.5		)	—			252.7
	Cash and Cash Equivalents, Beginning of Year	49.7			2.2			6.3			—			58.2
	Cash and Cash Equivalents, End of Period	$	302.5		$	2.6		$	5.8		$	—		$	310.9

Background_Recently_Adopted_Ac

Background Recently Adopted Accounting Standards (Details) (USD $)	3 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Background [Abstract]	'	'
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, before Tax	($0.20)	$0.50

Restructuring_Details

Restructuring (Details) (USD $)	3 Months Ended				3 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013	Sep. 30, 2013	Dec. 31, 2013	Dec. 31, 2013	Dec. 31, 2013
			Employee Severance [Member]	Employee Severance [Member]	Pension curtailment [Member]	Accelerated depreciation [Member]	Total Income Statement Impact [Member]
Restructuring Cost and Reserve [Line Items]	'	'	'	'	'	'	'
Restructuring Reserve	'	'	$1,800,000	$2,100,000	'	'	'
Restructuring expense	500,000	0	500,000	'	0	2,700,000	3,200,000
Restructuring and Related Cost, Cost Incurred to Date	'	'	2,600,000	'	1,700,000	12,300,000	16,600,000
Restructuring charges, expected cost remaining	'	'	900,000	'	0	5,800,000	6,700,000
Payments for Restructuring	'	'	($800,000)	'	'	'	'

Business_Combinations_Details

Business Combinations (Details) (USD $)	3 Months Ended		0 Months Ended		1 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2013	Dec. 31, 2012	29-May-13	Sep. 30, 2013
		Attune Foods segment [Member]	Attune Foods, Inc. [Member]	Assets of Hearthside Food Solutions [Member]	Premier Nutrition Corporation [Member]
Business Acquisition [Line Items]	'	'	'	'	'
Business Combination, Consideration Transferred	'	'	$9.20	$159.90	$186
Goodwill, Purchase Accounting Adjustments	$0.10	$0	'	'	'

Business_Combinations_Business

Business Combinations Business combinations pro forma financial information (Details) (USD $)	3 Months Ended
In Millions, except Per Share data, unless otherwise specified	Dec. 31, 2012
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]	'
Business Acquisition, Pro Forma Revenue	$284.20
Business Acquisition, Pro Forma Net Income (Loss)	$4.90
Business Acquisition, Pro Forma Earnings Per Share, Basic	$0.15
Business Acquisition, Pro Forma Earnings Per Share, Diluted	$0.15

Goodwill_Details

Goodwill (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Sep. 30, 2013
Goodwill [Roll Forward]	'	'
Goodwill, Gross	$1,917.40	$1,917.50
Goodwill, Impaired, Accumulated Impairment Loss	-427.8	-427.8
Goodwill	1,489.60	1,489.70
Goodwill, Purchase Accounting Adjustments	0.1	'
Currency translation adjustment	0.2	'
Attune Foods segment [Member]	'	'
Goodwill [Roll Forward]	'	'
Goodwill, Gross	75.1	75.1
Goodwill, Impaired, Accumulated Impairment Loss	0	0
Goodwill	75.1	75.1
Goodwill, Purchase Accounting Adjustments	0	'
Currency translation adjustment	0	'
Active Nutrition segment [Member] [Member]	'	'
Goodwill [Roll Forward]	'	'
Goodwill, Gross	48.4	48.3
Goodwill, Impaired, Accumulated Impairment Loss	0	0
Goodwill	48.4	48.3
Goodwill, Purchase Accounting Adjustments	0.1	'
Currency translation adjustment	0	'
Post Foods segment [Member]	'	'
Goodwill [Roll Forward]	'	'
Goodwill, Gross	1,793.90	1,794.10
Goodwill, Impaired, Accumulated Impairment Loss	-427.8	-427.8
Goodwill	1,366.10	1,366.30
Goodwill, Purchase Accounting Adjustments	0	'
Currency translation adjustment	$0.20	'

Intangible_Assets_net_Intangib2

Intangible Assets, net Intangible Assets, net (Details) (USD $)	Dec. 31, 2013	Sep. 30, 2012
In Millions, unless otherwise specified
Finite-Lived Intangible Assets [Abstract]	'	'
Finite-Lived Intangible Assets, Gross	$424.80	$424.80
Finite-Lived Intangible Assets, Accumulated Amortization	-72.8	-67.1
Finite-Lived Intangible Assets, Net	352	357.7
Intangible Assets, Net (Excluding Goodwill) [Abstract]	'	'
Carrying amount, total	965.5	965.5
Other intangible assets, net	892.7	898.4
Trademarks/brands	'	'
Indefinite-Lived Intangible Assets (Excluding Goodwill) [Abstract]	'	'
Carrying amount	540.7	540.7
Other Intangible Assets [Member]	'	'
Finite-Lived Intangible Assets [Abstract]	'	'
Finite-Lived Intangible Assets, Gross	4.7	4.7
Finite-Lived Intangible Assets, Accumulated Amortization	-0.7	-0.3
Finite-Lived Intangible Assets, Net	4	4.4
Customer relationships	'	'
Finite-Lived Intangible Assets [Abstract]	'	'
Finite-Lived Intangible Assets, Gross	258.6	258.6
Finite-Lived Intangible Assets, Accumulated Amortization	-44.3	-41
Finite-Lived Intangible Assets, Net	214.3	217.6
Trademarks/brands	'	'
Finite-Lived Intangible Assets [Abstract]	'	'
Finite-Lived Intangible Assets, Gross	161.5	161.5
Finite-Lived Intangible Assets, Accumulated Amortization	-27.8	-25.8
Finite-Lived Intangible Assets, Net	$133.70	$135.70

Earnings_per_Share_Details

Earnings per Share (Details) (USD $)	3 Months Ended
In Millions, except Per Share data, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]	'	'
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	3.8	2.2
Income (Loss) From Continuing Operations, Before Equity Method Investments, Net of Taxes	($2.40)	'
Net (loss) earnings	-2.4	7.6
Preferred stock dividends	2.6	0
Net (Loss) Earnings Available to Common Stockholders	($5)	$7.60
Weighted-average shares for basic earnings per share	32.7	32.6
Stock appreciation rights	0	0.1
Weighted-average shares for diluted earnings per share	32.7	32.7
Basic earnings per share (in usd per share)	($0.15)	$0.23
Diluted earnings per share (in usd per share)	($0.15)	$0.23
Stock Appreciation Rights (SARs) [Member]	'	'
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]	'	'
Stock appreciation rights	0	0.1
Preferred Stock [Member]	'	'
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]	'	'
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	10.7	'

Earnings_per_Share_Antidilutiv

Earnings per Share Antidilutive shares excluded from earnings per share (Details)	3 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]	'	'
Anti-Dilutive shares of Preferred stock excluded from Diluted Earnings per Share calculation	5.1	'
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	3.8	2.2
Preferred Stock [Member]	'	'
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]	'	'
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	10.7	'

Inventories_Details

Inventories (Details) (USD $)	Dec. 31, 2013	Sep. 30, 2013
In Millions, unless otherwise specified
Inventory [Abstract]	'	'
Inventory, Raw Materials, Net of Reserves	$33.10	$30.30
Inventory, Finished Goods, Net of Reserves	87.7	91.6
Inventories	$120.80	$121.90

Property_net_Details

Property, net (Details) (USD $)	Dec. 31, 2013	Sep. 30, 2013
In Millions, unless otherwise specified
Property, Plant and Equipment [Abstract]	'	'
Property, Plant and Equipment, Gross	$653.70	$640.50
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment	266	252
Property, net	$387.70	$388.50

Derivative_Financial_Instrumen2

Derivative Financial Instruments and Hedging (Details) (USD $)	Dec. 31, 2013	Sep. 30, 2013
In Millions, unless otherwise specified
Other Current Assets [Member]	'	'
Derivatives, Fair Value	'	'
Derivative Liability, Current	($0.20)	'
Other Assets [Member]	'	'
Derivatives, Fair Value	'	'
Derivative Asset, Fair Value, Gross Asset	'	0
Derivative Liability, Current	'	0.2
Assets [Member]	'	'
Derivatives, Fair Value	'	'
Derivative Assets (Liabilities), at Fair Value, Net	1.3	0.2
Assets [Member]	'	'
Derivatives, Fair Value	'	'
Derivative Assets (Liabilities), at Fair Value, Net	0.4	'
Commodity Contract [Member] | Other Current Assets [Member]	'	'
Derivatives, Fair Value	'	'
Derivative Asset, Fair Value, Gross Asset	0	'
Derivative Liability, Current	-0.2	'
Derivative Assets (Liabilities), at Fair Value, Net	-0.2	'
Commodity Contract [Member] | Other Assets [Member]	'	'
Derivatives, Fair Value	'	'
Derivative Asset, Fair Value, Gross Asset	'	0
Derivative Liability, Current	'	0.1
Derivative Assets (Liabilities), at Fair Value, Net	'	0.1
Foreign Exchange Contract [Member] | Other Assets [Member]	'	'
Derivatives, Fair Value	'	'
Derivative Asset, Fair Value, Gross Asset	0	'
Derivative Liability, Current	1.3	'
Natural Gas Futures [Member] | Other Current Assets [Member]	'	'
Derivatives, Fair Value	'	'
Derivative Asset, Fair Value, Gross Asset	0.6	'
Derivative Liability, Current	0	'
Derivative Assets (Liabilities), at Fair Value, Net	0.6	'
Natural Gas Futures [Member] | Other Assets [Member]	'	'
Derivatives, Fair Value	'	'
Derivative Asset, Fair Value, Gross Asset	'	0
Derivative Liability, Current	'	0.1
Derivative Assets (Liabilities), at Fair Value, Net	'	$0.10

Derivative_Financial_Instrumen3

Derivative Financial Instruments and Hedging Gain(Loss) recognized in earnings from derivative instruments (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Commodity Contract [Member] | Cost of Sales [Member]	'	'
Derivative Instruments, Gain (Loss) [Line Items]	'	'
Derivative Instruments, Gain (Loss) Recognized in Income, Net	$0.20	($0.50)
Natural Gas Futures [Member] | Cost of Sales [Member]	'	'
Derivative Instruments, Gain (Loss) [Line Items]	'	'
Derivative Instruments, Gain (Loss) Recognized in Income, Net	0.7	-0.2
Foreign Exchange Contract [Member] | Selling, General and Administrative Expenses [Member]	'	'
Derivative Instruments, Gain (Loss) [Line Items]	'	'
Derivative Instruments, Gain (Loss) Recognized in Income, Net	($0.70)	$0

Fair_Value_Measurements_Detail

Fair Value Measurements (Details) (USD $)	Dec. 31, 2013	Sep. 30, 2013
In Millions, unless otherwise specified
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis	'	'
Fair value of long-term debt	$2,012.70	'
Total	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis	'	'
Deferred Compensation Plan Assets	10	8.5
Derivative instruments	0.4	0
Assets, Fair Value Disclosure	10.4	8.5
Deferred compensation liabilities	16.3	13.4
Derivative Liability, Current	1.3	0.2
Financial and Nonfinancial Liabilities, Fair Value Disclosure	17.6	13.6
Level 1	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis	'	'
Deferred Compensation Plan Assets	10	8.5
Derivative instruments	0	0
Assets, Fair Value Disclosure	10	8.5
Deferred compensation liabilities	0	0
Derivative Liability, Current	0	0
Financial and Nonfinancial Liabilities, Fair Value Disclosure	0	0
Level 2	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis	'	'
Deferred Compensation Plan Assets	0	0
Derivative instruments	0.4	0
Assets, Fair Value Disclosure	0.4	0
Deferred compensation liabilities	16.3	13.4
Derivative Liability, Current	1.3	0.2
Financial and Nonfinancial Liabilities, Fair Value Disclosure	$17.60	$13.60

Preferred_Stock_Details

Preferred Stock (Details) (USD $)	0 Months Ended	3 Months Ended		12 Months Ended	3 Months Ended
	Jan. 14, 2014	Dec. 31, 2013	Dec. 31, 2012	Sep. 30, 2013	Dec. 31, 2013
				Series B Preferred Stock [Member]	Series C Preferred Stock [Member]
Class of Stock [Line Items]	'	'	'	'	'
Preferred Stock, Shares Issued	200,000	'	'	2.4	3
Preferred Stock, Dividend Rate, Percentage	'	'	'	3.75%	2.50%
Preferred Stock Purchase Option	'	'	'	'	450,000
Proceeds from Issuance of Preferred Stock and Preference Stock	$19,400,000	$290,800,000	$0	$234	$290.80
Payments of Stock Issuance Costs	'	'	'	$7.50	$9.20
Preferred Stock, Par or Stated Value Per Share	'	'	'	$0.01	$0.01
Preferred Stock, Liquidation Preference Per Share	'	'	'	$100	$100
Convertible Preferred Stock, Shares Issued upon Conversion	'	'	'	2.1192	1.8477
Conversion price of convertible preferred stock	'	'	'	$47.19	$54.12
Preferred Stock, Redemption Price, Percentage of Liquidation Preference	'	'	'	100.00%	100.00%
Stock Redemption Triggering Event, Common Stock as Percentage of Conversion Price In Effect	'	'	'	130.00%	150.00%
Stock Redemption Triggering Event, Number of Trading during Thirty Day Consecutive Period, Conversion Price Percentage Met	'	'	'	'20 days	'20 days

Long_Term_Debt_Details

Long Term Debt (Details) (USD $)	3 Months Ended							3 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Dec. 31, 2013	Sep. 30, 2013	Dec. 31, 2013	Sep. 30, 2013	Mar. 31, 2012	Dec. 31, 2013	Sep. 30, 2013
			Parent Company	Parent Company	7.375% Senior Notes [Member]	7.375% Senior Notes [Member]	7.375% Senior Notes [Member]	6.75% Senior Notes [Member] [Member]	6.75% Senior Notes [Member] [Member]
Debt Instrument	'	'	'	'	'	'	'	'	'
Debt Instrument, Face Amount	'	'	'	'	'	'	'	$525,000,000	'
Senior Notes	'	'	'	'	1,375,000,000	1,375,000,000	775,000,000	525,000,000	0
Long-term Debt	1,900,000,000	1,375,000,000	'	'	'	'	'	'	'
Total long-term debt	1,932,900,000	1,408,600,000	1,932,900,000	1,408,600,000	'	'	'	'	'
Debt Instrument, Increase, Additional Borrowings	'	'	'	'	'	'	'	516,200,000	'
Debt Issuance Cost	8,800,000	'	'	'	'	'	'	'	'
Debt Instrument, Interest Rate, Stated Percentage	'	'	'	'	7.38%	'	'	6.75%	'
Debt Instrument, Unamortized Premium	$32,900,000	$33,600,000	'	'	'	'	'	'	'

Pension_and_Other_Postretireme2

Pension and Other Postretirement Benefits - Components of Net Periodic Benefit Cost (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Pension Benefits	'	'
Components of net periodic benefit cost [Abstract]	'	'
Service cost	$0.90	$1.10
Interest cost	0.5	0.4
Expected return on plan assets	-0.5	-0.4
Recognized net actuarial loss	0.2	0.2
Recognized prior service cost	0.1	0.1
Net periodic benefit cost	1.2	1.4
Other Benefits	'	'
Components of net periodic benefit cost [Abstract]	'	'
Service cost	0.5	0.6
Interest cost	1.1	1
Recognized net actuarial loss	0.1	0.4
Recognized prior service cost	-0.6	-0.3
Net periodic benefit cost	$1.10	$1.70

Transaction_with_Former_Owner_

Transaction with Former Owner Transaction with Former Owner (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Ralcorp [Member]	'	'
Related Party Transactions	'	'
Related party costs reported in selling, general and administrative expenses	$0.40	$1.60
Net sales, related party transactions	3.7	4
Net Investment [Member]	'	'
Related Party Transactions	'	'
Separation related adjustments	$0.20	$2.80

Segment_Information_Segments_D

Segment Information Segments (Details) (USD $)	3 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Sep. 30, 2013
Segment Reporting Information [Line Items]	'	'	'
Assets	$4,289,100,000	'	$3,473,800,000
Net Sales	297,000,000	236,900,000	'
Other Expenses	24,900,000	16,700,000	'
Restructuring Reserve, Accelerated Depreciation	2,700,000	0	'
Restructuring expense	500,000	0	'
Interest Expense	29,000,000	19,200,000	'
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest	-3,800,000	11,100,000	'
Depreciation and amortization	21,100,000	16,200,000	'
Post Foods segment [Member]	'	'	'
Segment Reporting Information [Line Items]	'	'	'
Assets	2,598,500,000	'	2,614,900,000
Segment Reporting Information, Revenue for Reportable Segment	236,900,000	236,900,000	'
Segment Profit	46,500,000	47,000,000	'
Depreciation and amortization	13,200,000	15,000,000	'
Attune Foods segment [Member]	'	'	'
Segment Reporting Information [Line Items]	'	'	'
Assets	170,300,000	'	172,000,000
Segment Reporting Information, Revenue for Reportable Segment	23,200,000	0	'
Segment Profit	2,600,000	0	'
Depreciation and amortization	1,800,000	0	'
Active Nutrition segment [Member] [Member]	'	'	'
Segment Reporting Information [Line Items]	'	'	'
Assets	199,200,000	'	198,000,000
Segment Reporting Information, Revenue for Reportable Segment	37,200,000	0	'
Segment Profit	4,200,000	0	'
Depreciation and amortization	1,600,000	0	'
Total Segment [Member]	'	'	'
Segment Reporting Information [Line Items]	'	'	'
Segment Profit	53,300,000	47,000,000	'
Depreciation and amortization	16,600,000	15,000,000	'
Intersegment Eliminations [Member]	'	'	'
Segment Reporting Information [Line Items]	'	'	'
Net Sales	-300,000	0	'
Corporate Segment [Member]	'	'	'
Segment Reporting Information [Line Items]	'	'	'
Assets	1,321,100,000	'	488,900,000
Restructuring Reserve, Accelerated Depreciation	2,700,000	'	'
Depreciation and amortization	$1,800,000	$1,200,000	'

Guarantor_Financials_Combined_

Guarantor Financials - Combined Statements of Operations (Condensed) (Details) (USD $)	3 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Consolidated Statements Of Operations (Condensed) [Abstract]	'	'
Net Sales	$297,000,000	$236,900,000
Cost of goods sold	182,500,000	131,200,000
Gross Profit	114,500,000	105,700,000
Selling, general and administrative expenses	83,000,000	72,100,000
Amortization of intangible assets	5,700,000	3,200,000
Restructuring expense	500,000	0
Other operating expenses, net	100,000	100,000
Operating (Loss) Profit	25,200,000	30,300,000
Interest Expense	29,000,000	19,200,000
Earnings before Income Taxes	-3,800,000	11,100,000
Income tax benefit	-1,400,000	3,500,000
Net (Loss) Earnings before Equity in Subsidiaries	-2,400,000	'
Equity in earnings of partnership	0	0
Net Earnings	-2,400,000	7,600,000
Total Comprehensive Loss	-4,700,000	7,100,000
Parent Company	'	'
Consolidated Statements Of Operations (Condensed) [Abstract]	'	'
Net Sales	0	0
Cost of goods sold	0	0
Gross Profit	0	0
Selling, general and administrative expenses	4,500,000	2,500,000
Amortization of intangible assets	0	0
Restructuring expense	0	'
Other operating expenses, net	0	0
Operating (Loss) Profit	-4,500,000	-2,500,000
Interest Expense	29,000,000	19,200,000
Earnings before Income Taxes	-33,500,000	-21,700,000
Income tax benefit	-11,900,000	-7,000,000
Net (Loss) Earnings before Equity in Subsidiaries	-21,600,000	-14,700,000
Equity in earnings of partnership	19,200,000	22,300,000
Net Earnings	-2,400,000	7,600,000
Total Comprehensive Loss	-4,700,000	7,100,000
Guarantors	'	'
Consolidated Statements Of Operations (Condensed) [Abstract]	'	'
Net Sales	284,800,000	223,300,000
Cost of goods sold	174,100,000	122,200,000
Gross Profit	110,700,000	101,100,000
Selling, general and administrative expenses	74,600,000	65,400,000
Amortization of intangible assets	5,700,000	3,200,000
Restructuring expense	500,000	'
Other operating expenses, net	100,000	100,000
Operating (Loss) Profit	29,800,000	32,400,000
Interest Expense	0	0
Earnings before Income Taxes	29,800,000	32,400,000
Income tax benefit	10,500,000	10,400,000
Net (Loss) Earnings before Equity in Subsidiaries	19,300,000	22,000,000
Equity in earnings of partnership	0	0
Net Earnings	19,300,000	22,000,000
Total Comprehensive Loss	19,200,000	22,200,000
Non-Guarantors	'	'
Consolidated Statements Of Operations (Condensed) [Abstract]	'	'
Net Sales	18,800,000	20,900,000
Cost of goods sold	15,000,000	16,300,000
Gross Profit	3,800,000	4,600,000
Selling, general and administrative expenses	3,900,000	4,200,000
Amortization of intangible assets	0	0
Restructuring expense	0	'
Other operating expenses, net	0	0
Operating (Loss) Profit	-100,000	400,000
Interest Expense	0	0
Earnings before Income Taxes	-100,000	400,000
Income tax benefit	0	100,000
Net (Loss) Earnings before Equity in Subsidiaries	-100,000	300,000
Equity in earnings of partnership	0	0
Net Earnings	-100,000	300,000
Total Comprehensive Loss	-2,300,000	-400,000
Eliminations	'	'
Consolidated Statements Of Operations (Condensed) [Abstract]	'	'
Net Sales	-6,600,000	-7,300,000
Cost of goods sold	-6,600,000	-7,300,000
Gross Profit	0	0
Selling, general and administrative expenses	0	0
Amortization of intangible assets	0	0
Restructuring expense	0	'
Other operating expenses, net	0	0
Operating (Loss) Profit	0	0
Interest Expense	0	0
Earnings before Income Taxes	0	0
Income tax benefit	0	0
Net (Loss) Earnings before Equity in Subsidiaries	0	0
Equity in earnings of partnership	-19,200,000	-22,300,000
Net Earnings	-19,200,000	-22,300,000
Total Comprehensive Loss	($16,900,000)	($21,800,000)

Guarantor_Financials_Consolida

Guarantor Financials - Consolidated Balance Sheets (Condensed) (Details) (USD $)	Dec. 31, 2013	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2012
In Millions, unless otherwise specified
Assets, Current [Abstract]	'	'	'	'
Cash and cash equivalents	$884.90	$402	$310.90	$58.20
Restricted Cash and Cash Equivalents, Current	1.1	38.1	'	'
Receivables, net	84.9	83.2	'	'
Inventories	120.8	121.9	'	'
Deferred Tax Assets, Net of Valuation Allowance, Current	12.1	11.9	'	'
Prepaid expenses and other current assets	10.8	11	'	'
Total current assets	1,114.60	668.1	'	'
Assets, Noncurrent [Abstract]	'	'	'	'
Property, net	387.7	388.5	'	'
Goodwill	1,489.60	1,489.70	'	'
Other intangible assets, net	892.7	898.4	'	'
Intercompany receivable	0	0	'	'
Investment in subsidiaries	0	0	'	'
Cash Advance for Acquisition	366.2	0	'	'
Deferred Tax Assets, Net of Valuation Allowance	2.2	2.4	'	'
Other assets	36.1	26.7	'	'
Total Assets	4,289.10	3,473.80	'	'
Liabilities, Current [Abstract]	'	'	'	'
Accounts payable	56.8	77.1	'	'
Other current liabilities	94.3	68.9	'	'
Total current liabilities	151.1	146	'	'
Liabilities, Noncurrent [Abstract]	'	'	'	'
Long-term Debt, Excluding Current Maturities	1,932.90	1,408.60	'	'
Intercompany payable	0	0	'	'
Deferred income taxes	302.4	304.3	'	'
Other liabilities	117	116.3	'	'
Total liabilities	2,503.40	1,975.20	'	'
Total Stockholders' Equity	1,785.70	1,498.60	'	'
Total Liabilities and Stockholders' Equity	4,289.10	3,473.80	'	'
Parent Company	'	'	'	'
Assets, Current [Abstract]	'	'	'	'
Cash and cash equivalents	877.9	391.4	302.5	49.7
Restricted Cash and Cash Equivalents, Current	1.1	38.1	'	'
Receivables, net	0	0.3	'	'
Inventories	0	0	'	'
Deferred Tax Assets, Net of Valuation Allowance, Current	12.1	11.8	'	'
Prepaid expenses and other current assets	3.9	3.2	'	'
Total current assets	895	444.8	'	'
Assets, Noncurrent [Abstract]	'	'	'	'
Property, net	0	0	'	'
Goodwill	0	0	'	'
Other intangible assets, net	0	0	'	'
Intercompany receivable	394.8	391.9	'	'
Investment in subsidiaries	2,396.30	2,384	'	'
Cash Advance for Acquisition	366.2	'	'	'
Deferred Tax Assets, Net of Valuation Allowance	0	0	'	'
Other assets	31.5	24	'	'
Total Assets	4,083.80	3,244.70	'	'
Liabilities, Current [Abstract]	'	'	'	'
Accounts payable	0.6	0.5	'	'
Other current liabilities	49.7	18.5	'	'
Total current liabilities	50.3	19	'	'
Liabilities, Noncurrent [Abstract]	'	'	'	'
Long-term Debt, Excluding Current Maturities	1,932.90	1,408.60	'	'
Intercompany payable	0	0	'	'
Deferred income taxes	302.4	304.3	'	'
Other liabilities	12.5	14.2	'	'
Total liabilities	2,298.10	1,746.10	'	'
Total Stockholders' Equity	1,785.70	1,498.60	'	'
Total Liabilities and Stockholders' Equity	4,083.80	3,244.70	'	'
Guarantors	'	'	'	'
Assets, Current [Abstract]	'	'	'	'
Cash and cash equivalents	0.9	4.1	2.6	2.2
Restricted Cash and Cash Equivalents, Current	0	0	'	'
Receivables, net	78.3	75.9	'	'
Inventories	116.3	115.9	'	'
Deferred Tax Assets, Net of Valuation Allowance, Current	0	0	'	'
Prepaid expenses and other current assets	6.6	7.4	'	'
Total current assets	202.1	203.3	'	'
Assets, Noncurrent [Abstract]	'	'	'	'
Property, net	344.4	342.4	'	'
Goodwill	1,483.40	1,483.30	'	'
Other intangible assets, net	892.7	898.4	'	'
Intercompany receivable	0	0	'	'
Investment in subsidiaries	0	0	'	'
Cash Advance for Acquisition	0	'	'	'
Deferred Tax Assets, Net of Valuation Allowance	0	0	'	'
Other assets	3.9	2.7	'	'
Total Assets	2,926.50	2,930.10	'	'
Liabilities, Current [Abstract]	'	'	'	'
Accounts payable	57.7	76.9	'	'
Other current liabilities	39.6	43.8	'	'
Total current liabilities	97.3	120.7	'	'
Liabilities, Noncurrent [Abstract]	'	'	'	'
Long-term Debt, Excluding Current Maturities	0	0	'	'
Intercompany payable	394.5	391.7	'	'
Deferred income taxes	0	0	'	'
Other liabilities	97.3	94.9	'	'
Total liabilities	589.1	607.3	'	'
Total Stockholders' Equity	2,337.40	2,322.80	'	'
Total Liabilities and Stockholders' Equity	2,926.50	2,930.10	'	'
Non-Guarantors	'	'	'	'
Assets, Current [Abstract]	'	'	'	'
Cash and cash equivalents	8.6	8.2	5.8	6.3
Restricted Cash and Cash Equivalents, Current	0	0	'	'
Receivables, net	9.8	10.9	'	'
Inventories	4.5	6	'	'
Deferred Tax Assets, Net of Valuation Allowance, Current	0	0.1	'	'
Prepaid expenses and other current assets	0.3	0.4	'	'
Total current assets	23.2	25.6	'	'
Assets, Noncurrent [Abstract]	'	'	'	'
Property, net	43.3	46.1	'	'
Goodwill	6.2	6.4	'	'
Other intangible assets, net	0	0	'	'
Intercompany receivable	0	0	'	'
Investment in subsidiaries	0	0	'	'
Cash Advance for Acquisition	0	'	'	'
Deferred Tax Assets, Net of Valuation Allowance	2.2	2.4	'	'
Other assets	0.7	0	'	'
Total Assets	75.6	80.5	'	'
Liabilities, Current [Abstract]	'	'	'	'
Accounts payable	4.2	5.3	'	'
Other current liabilities	5	6.6	'	'
Total current liabilities	9.2	11.9	'	'
Liabilities, Noncurrent [Abstract]	'	'	'	'
Long-term Debt, Excluding Current Maturities	0	0	'	'
Intercompany payable	0.3	0.2	'	'
Deferred income taxes	0	0	'	'
Other liabilities	7.2	7.2	'	'
Total liabilities	16.7	19.3	'	'
Total Stockholders' Equity	58.9	61.2	'	'
Total Liabilities and Stockholders' Equity	75.6	80.5	'	'
Eliminations	'	'	'	'
Assets, Current [Abstract]	'	'	'	'
Cash and cash equivalents	-2.5	-1.7	0	0
Restricted Cash and Cash Equivalents, Current	0	0	'	'
Receivables, net	-3.2	-3.9	'	'
Inventories	0	0	'	'
Deferred Tax Assets, Net of Valuation Allowance, Current	0	0	'	'
Prepaid expenses and other current assets	0	0	'	'
Total current assets	-5.7	-5.6	'	'
Assets, Noncurrent [Abstract]	'	'	'	'
Property, net	0	0	'	'
Goodwill	0	0	'	'
Other intangible assets, net	0	0	'	'
Intercompany receivable	-394.8	-391.9	'	'
Investment in subsidiaries	-2,396.30	-2,384	'	'
Cash Advance for Acquisition	0	'	'	'
Deferred Tax Assets, Net of Valuation Allowance	0	0	'	'
Other assets	0	0	'	'
Total Assets	-2,796.80	-2,781.50	'	'
Liabilities, Current [Abstract]	'	'	'	'
Accounts payable	-5.7	-5.6	'	'
Other current liabilities	0	0	'	'
Total current liabilities	-5.7	-5.6	'	'
Liabilities, Noncurrent [Abstract]	'	'	'	'
Long-term Debt, Excluding Current Maturities	0	0	'	'
Intercompany payable	-394.8	-391.9	'	'
Deferred income taxes	0	0	'	'
Other liabilities	0	0	'	'
Total liabilities	-400.5	-397.5	'	'
Total Stockholders' Equity	-2,396.30	-2,384	'	'
Total Liabilities and Stockholders' Equity	($2,796.80)	($2,781.50)	'	'

Guarantor_Financials_Consolida1

Guarantor Financials - Consolidated Statements of Cash Flows (Details) (USD $)	3 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Cash Flows from Operating Activities:	'	'
Net Cash Provided by (Used in) Operating Activities	$24,900,000	$23,600,000
Cash Flows from Investing Activities:	'	'
Additions to property and intangible assets	-16,500,000	-5,000,000
Increase (Decrease) in Restricted Cash	37,000,000	0
Payments to Acquire Interest in Subsidiaries and Affiliates	'	0
Payments to Acquire Businesses, Net of Cash Acquired	0	-9,200,000
Increase Decrease in Cash Advance for Acquisition	-366,200,000	0
Net cash used by investing activities	-345,700,000	-14,200,000
Cash Flows from Financing Activities:	'	'
Proceeds from Equity Contributions	0	'
Proceeds from issuance of Senior Notes	525,000,000	250,000,000
Proceeds from Issuance of Preferred Stock and Preference Stock	290,800,000	0
Repayments of long-term debt	0	-2,200,000
Payments of Ordinary Dividends, Preferred Stock and Preference Stock	-2,300,000	0
Payments of Debt Issuance Costs	-8,800,000	-4,600,000
Proceeds from (Payments for) Other Financing Activities	-100,000	200,000
Proceeds from Equity Contributions to Subsidiary	'	0
Net Cash Provided by (Used in) Financing Activities	804,600,000	243,400,000
Effect of exchange rate changes on cash	-900,000	-100,000
Net Decrease in Cash and Cash Equivalents	482,900,000	252,700,000
Cash and cash equivalents, beginning of year	402,000,000	58,200,000
Cash and cash equivalents, end of year	884,900,000	310,900,000
Parent Company	'	'
Cash Flows from Operating Activities:	'	'
Net Cash Provided by (Used in) Operating Activities	11,700,000	17,500,000
Cash Flows from Investing Activities:	'	'
Additions to property and intangible assets	0	0
Increase (Decrease) in Restricted Cash	37,000,000	'
Payments to Acquire Interest in Subsidiaries and Affiliates	'	-8,100,000
Payments to Acquire Businesses, Net of Cash Acquired	'	0
Increase Decrease in Cash Advance for Acquisition	-366,200,000	'
Net cash used by investing activities	-329,200,000	-8,100,000
Cash Flows from Financing Activities:	'	'
Proceeds from Equity Contributions	0	'
Proceeds from issuance of Senior Notes	525,000,000	250,000,000
Proceeds from Issuance of Preferred Stock and Preference Stock	290,800,000	'
Repayments of long-term debt	0	-2,200,000
Payments of Ordinary Dividends, Preferred Stock and Preference Stock	-2,300,000	'
Payments of Debt Issuance Costs	-8,800,000	-4,600,000
Proceeds from (Payments for) Other Financing Activities	-100,000	200,000
Proceeds from Equity Contributions to Subsidiary	'	0
Net Cash Provided by (Used in) Financing Activities	804,600,000	243,400,000
Effect of exchange rate changes on cash	-600,000	0
Net Decrease in Cash and Cash Equivalents	486,500,000	252,800,000
Cash and cash equivalents, beginning of year	391,400,000	49,700,000
Cash and cash equivalents, end of year	877,900,000	302,500,000
Guarantors	'	'
Cash Flows from Operating Activities:	'	'
Net Cash Provided by (Used in) Operating Activities	26,900,000	6,300,000
Cash Flows from Investing Activities:	'	'
Additions to property and intangible assets	-16,200,000	-4,800,000
Increase (Decrease) in Restricted Cash	0	'
Payments to Acquire Interest in Subsidiaries and Affiliates	'	0
Payments to Acquire Businesses, Net of Cash Acquired	'	-9,200,000
Increase Decrease in Cash Advance for Acquisition	0	'
Net cash used by investing activities	-16,200,000	-14,000,000
Cash Flows from Financing Activities:	'	'
Proceeds from Equity Contributions	-13,900,000	'
Proceeds from issuance of Senior Notes	0	0
Proceeds from Issuance of Preferred Stock and Preference Stock	0	'
Repayments of long-term debt	0	0
Payments of Ordinary Dividends, Preferred Stock and Preference Stock	0	'
Payments of Debt Issuance Costs	0	0
Proceeds from (Payments for) Other Financing Activities	0	0
Proceeds from Equity Contributions to Subsidiary	'	8,100,000
Net Cash Provided by (Used in) Financing Activities	-13,900,000	8,100,000
Effect of exchange rate changes on cash	0	0
Net Decrease in Cash and Cash Equivalents	-3,200,000	400,000
Cash and cash equivalents, beginning of year	4,100,000	2,200,000
Cash and cash equivalents, end of year	900,000	2,600,000
Non-Guarantors	'	'
Cash Flows from Operating Activities:	'	'
Net Cash Provided by (Used in) Operating Activities	1,000,000	-200,000
Cash Flows from Investing Activities:	'	'
Additions to property and intangible assets	-300,000	-200,000
Increase (Decrease) in Restricted Cash	0	'
Payments to Acquire Interest in Subsidiaries and Affiliates	'	0
Payments to Acquire Businesses, Net of Cash Acquired	'	0
Increase Decrease in Cash Advance for Acquisition	0	'
Net cash used by investing activities	-300,000	-200,000
Cash Flows from Financing Activities:	'	'
Proceeds from Equity Contributions	0	'
Proceeds from issuance of Senior Notes	0	0
Proceeds from Issuance of Preferred Stock and Preference Stock	0	'
Repayments of long-term debt	0	0
Payments of Ordinary Dividends, Preferred Stock and Preference Stock	0	'
Payments of Debt Issuance Costs	0	0
Proceeds from (Payments for) Other Financing Activities	0	0
Proceeds from Equity Contributions to Subsidiary	'	0
Net Cash Provided by (Used in) Financing Activities	0	0
Effect of exchange rate changes on cash	-300,000	-100,000
Net Decrease in Cash and Cash Equivalents	400,000	-500,000
Cash and cash equivalents, beginning of year	8,200,000	6,300,000
Cash and cash equivalents, end of year	8,600,000	5,800,000
Eliminations	'	'
Cash Flows from Operating Activities:	'	'
Net Cash Provided by (Used in) Operating Activities	-14,700,000	0
Cash Flows from Investing Activities:	'	'
Additions to property and intangible assets	0	0
Increase (Decrease) in Restricted Cash	0	'
Payments to Acquire Interest in Subsidiaries and Affiliates	'	8,100,000
Payments to Acquire Businesses, Net of Cash Acquired	'	0
Increase Decrease in Cash Advance for Acquisition	0	'
Net cash used by investing activities	0	8,100,000
Cash Flows from Financing Activities:	'	'
Proceeds from Equity Contributions	13,900,000	'
Proceeds from issuance of Senior Notes	0	0
Proceeds from Issuance of Preferred Stock and Preference Stock	0	'
Repayments of long-term debt	0	0
Payments of Ordinary Dividends, Preferred Stock and Preference Stock	0	'
Payments of Debt Issuance Costs	0	0
Proceeds from (Payments for) Other Financing Activities	0	0
Proceeds from Equity Contributions to Subsidiary	'	-8,100,000
Net Cash Provided by (Used in) Financing Activities	13,900,000	-8,100,000
Effect of exchange rate changes on cash	0	0
Net Decrease in Cash and Cash Equivalents	-800,000	0
Cash and cash equivalents, beginning of year	-1,700,000	0
Cash and cash equivalents, end of year	($2,500,000)	$0

Guarantor_Financials_Narrative

Guarantor Financials Narrative (Details) (USD $)	Dec. 31, 2013	Sep. 30, 2013	Mar. 31, 2012
In Millions, unless otherwise specified
7.375% Senior Notes [Member]	'	'	'
Guarantor Obligations [Line Items]	'	'	'
Senior Notes	$1,375	$1,375	$775
6.75% Senior Notes [Member] [Member]	'	'	'
Guarantor Obligations [Line Items]	'	'	'
Senior Notes	525	0	'
Debt Instrument, Face Amount	$525	'	'

Subsequent_Event_Details

Subsequent Event (Details) (USD $)

0 Months Ended

3 Months Ended

0 Months Ended

12 Months Ended

0 Months Ended

3 Months Ended

0 Months Ended

Jan. 14, 2014

Dec. 31, 2013

Dec. 31, 2012

Jan. 29, 2014

Jan. 02, 2014

Feb. 02, 2014

Feb. 02, 2014

Feb. 02, 2014

Sep. 30, 2013

Jan. 10, 2014

Dec. 31, 2013

Jan. 14, 2014

Jan. 10, 2014

Subsequent Event [Member]

Dakota Growers [Member]

Golden Boy [Member]

Dymatize [Member]

PowerBar and Musashi [Member]

Series B Preferred Stock [Member]

Series B Preferred Stock [Member]

Series C Preferred Stock [Member]

Series C Preferred Stock [Member]

Series C Preferred Stock [Member]

Subsequent Event [Member]

Subsequent Event [Member]

Subsequent Event [Member]

Subsequent Event [Member]

Subsequent Event [Member]

Subsequent Event [Member]

Subsequent Event [Member]

Subsequent Event [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

Acquisition Purchase Price, Gross

'

'

'

'

$370,000,000

$320,000,000

$380,000,000

$150,000,000

'

'

'

'

'

Business Combination, Consideration Transferred

'

'

'

'

366,200,000

321,100,000

392,500,000

'

'

'

'

'

'

Preferred Stock, Dividend Rate, Per-Dollar-Amount

'

'

'

'

'

'

'

'

'

$0.94

'

'

$0.42

Preferred Stock, Shares Issued

200,000

'

'

'

'

'

'

'

2.4

'

3

'

'

Preferred Stock, Dividend Rate, Percentage

'

'

'

'

'

'

'

'

3.75%

3.75%

2.50%

2.50%

2.50%

Proceeds from Issuance of Preferred Stock and Preference Stock

19,400,000

290,800,000

0

'

'

'

'

'

234

'

290.8

'

'

Line of Credit Facility, Maximum Borrowing Capacity

'

'

'

$300,000,000

'

'

'

'

'

'

'

'

'