Deferral Of Employee Additional Cash Consideration If Compensation Exceeds Legislated Maximum Compensation, Percentage

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- Definition

Deferred Compensation Plan Gain (Loss) On Market Adjustment, Before Tax

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- Definition

Employee Service Share Based Compensation Awards Nonvested Total Compensation Cost Not Yet Recognized Period For Recognition.

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- Definition

Employer Matching Contribution Percentage, Deferred Compensation, Equity Option

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- Definition

Executive Savings Investment Plan, Matching, Vesting Percentage Per Year Of Service

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- Definition

Percentage Of Employee Cash Compensation Eligible For Deferral Under Executive Savings Investment Plan

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- Definition

Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Total Share Based Liabilities Paid During Period

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No definition available.

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- Definition

Share based compensation arrangement by share based payment award expiration

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- Definition

Number of shares cash paid will be equal to.

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No definition available.

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- Definition

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

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-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 14

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-Number 123R

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- Definition

The compensation expense recognized during the period pertaining to the deferred compensation arrangement.

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-Name Accounting Standards Codification

-Topic 710

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-Publisher AICPA

-Name Accounting Principles Board Opinion (APB)

-Number 12

-Paragraph 6, 7

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- Definition

As of the balance sheet date, the aggregate unrecognized cost of equity-based awards made to employees under equity-based compensation awards that have yet to vest.

+ References

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- Definition

The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period.

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- Definition

Description of the period of time over which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, which may be expressed in a variety of ways (for example, in years, month and year).

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- Definition

Equity-based compensation cost during the period with respect to the award, which will be recognized in income (as well as the total recognized tax benefit) or capitalized as part of the cost of an asset.

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-Name Accounting Standards Codification

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- Definition

The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

-Subparagraph b(2)(a)

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- Definition

The total fair value of equity-based awards for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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- Definition

The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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

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-Name Accounting Standards Codification

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The total accumulated difference between fair values of underlying shares on dates of exercise and exercise price on options which were exercised (or share units converted) into shares during the reporting period under the plan.

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- Definition

This item represents the conversion ratio used in the calculation of a stock split.

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-Publisher FASB

-Name Accounting Standards Codification

-Glossary Stock Split

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Stock-Based Compensation Plans (Narrative) (Details) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended																			12 Months Ended					12 Months Ended
	Sep. 30, 2012 Y	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2012 Stock Options [Member] Y	Sep. 30, 2011 Stock Options [Member]	Sep. 30, 2010 Stock Options [Member]	Sep. 30, 2012 Stock Appreciation Rights (SARs) [Member]	Sep. 30, 2011 Stock Appreciation Rights (SARs) [Member]	Sep. 30, 2010 Stock Appreciation Rights (SARs) [Member]	Sep. 30, 2012 Restricted Stock Awards [Member]	Sep. 30, 2011 Restricted Stock Awards [Member]	Sep. 30, 2010 Restricted Stock Awards [Member]	Sep. 30, 2012 Other Stock-Based Compensation Awards [Member]	Sep. 30, 2011 Other Stock-Based Compensation Awards [Member]	Sep. 30, 2010 Other Stock-Based Compensation Awards [Member]	Sep. 30, 2012 Deferred Compensation [Member]	Sep. 30, 2011 Deferred Compensation [Member]	Sep. 30, 2010 Deferred Compensation [Member]	Sep. 30, 2012 Restricted Stock Units (RSUs) [Member]	Sep. 30, 2012 Minimum [Member] Stock Options [Member]	Sep. 30, 2012 Minimum [Member] Deferred Compensation [Member]	Sep. 30, 2012 Maximum [Member] Stock Options [Member]	Sep. 30, 2012 Maximum [Member] Deferred Compensation [Member]	Sep. 30, 2012 AIPC And Post Foods Employees [Member]	Sep. 30, 2010 Officer [Member]	Sep. 21, 2011 Officer [Member]	Sep. 30, 2012 Fiscal 2013 [Member] Restricted Stock Awards [Member]	Sep. 30, 2012 Fiscal 2014 [Member] Restricted Stock Awards [Member]	Sep. 30, 2012 Fiscal 2015 [Member] Restricted Stock Awards [Member]	Sep. 30, 2012 Fiscal 2016 [Member] Restricted Stock Awards [Member]	Sep. 30, 2012 Fiscal 2017 [Member] Restricted Stock Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Conversion ratio for stock options, stock appreciation rights and other stock awards	1.18
Shares available for future awards	3,061,077
Stock-based liabilities paid	$ 12.2	$ 1.0	$ 1.6
Total compensation cost for stock-based compensation awards recognized	15.7	14.8	15.8
Expense recorded													1.3	1.7	0										(1.0)
Deferred tax benefit	6.0	5.3	6.1
Compensation cost not yet recognized	24.9
Compensation cost not yet recognized, weighted average period of recognition, years	2.9
Award vesting period, years																				three		six
Maximum term for awards granted, years				10
Total intrinsic value of stock options exercised				10.0	12.9	9.9	13.0	2.9	0.3
Fair value of restricted stock awards vested										9.4	5.1	0
Number of shares cash paid will be equal to																								54,361		57,585
Awards outstanding										318,500	340,510								175,000								41,000	141,000	13,000	13,000	110,000
Employer maximum matching percentage on equity option																33.33%
Percentage of employee cash compensation eligible for deferral under executive savings investment plan																44.00%
Additional deferral of cash consideration percentage																					2.00%		6.00%
Executive savings investment plan, matching, vesting percentage per year of service	25.00%
Deferred compensation plan, compensation expenses																0.6	0.5	0.5
Pretax gain (loss) on market adjustment																$ (2.6)	$ 2.7	$ 0.1