Mueller Water Products (MWA) 10-K 26 Nov 14 2014 FY Annual report Financial data

Document_and_Entity_Informatio

Document and Entity Information (USD $)	12 Months Ended
	Sep. 30, 2014	Nov. 13, 2014	Mar. 31, 2014
Document Information [Line Items]	'	'	'
Document Fiscal Period Focus	'FY	'	'
Document Period End Date	30-Sep-14	'	'
Document Fiscal Year Focus	'2014	'	'
Entity Well-known Seasoned Issuer	'No	'	'
Entity Registrant Name	'Mueller Water Products, Inc.	'	'
Entity Central Index Key	'0001350593	'	'
Current Fiscal Year End Date	'--09-30	'	'
Entity Filer Category	'Large Accelerated Filer	'	'
Document Type	'10-K	'	'
Entity Voluntary Filers	'No	'	'
Entity Current Reporting Status	'Yes	'	'
Amendment Flag	'false	'	'
Entity Common Stock, Shares Outstanding	'	159,893,168	'
Entity Public Float	'	'	$1,484,364,260

Consolidated_Balance_Sheets

Consolidated Balance Sheets (USD $)	Sep. 30, 2014	Sep. 30, 2013
In Millions, unless otherwise specified
Assets:	'	'
Cash and cash equivalents	$161.10	$123.60
Receivables, net	182.1	164.5
Inventories	198	208.5
Deferred income taxes	38.6	26.7
Other current assets	44.1	46.1
Total current assets	623.9	569.4
Property, plant and equipment, net	146.3	141.9
Intangible assets	533.6	553.1
Other noncurrent assets	13.3	17.5
Total assets	1,317.10	1,281.90
Liabilities and equity:	'	'
Current portion of long-term debt	46.2	1.3
Accounts payable	116	101.2
Other current liabilities	82.2	80.6
Total current liabilities	244.4	183.1
Long-term debt	499.4	599.5
Deferred income taxes	150.4	141.5
Other noncurrent liabilities	71.3	29.6
Total liabilities	965.5	953.7
Common Stock	1.6	1.6
Additional paid-in capital	1,582.80	1,584.40
Accumulated deficit	-1,173.70	-1,229.20
Accumulated Other Comprehensive Income (Loss), Net of Tax	-60.7	-28.6
Total equity	350	328.2
Equity Attributable to Noncontrolling Interest	1.6	0
Equity	351.6	328.2
Total liabilities and equity	$1,317.10	$1,281.90

Consolidated_Balance_Sheets_Pa

Consolidated Balance Sheets (Parenthetical)	Sep. 30, 2014	Sep. 30, 2013
Statement of Financial Position [Abstract]	'	'
Series A common stock, shares authorized	600,000,000	600,000,000
Series A common stock, shares outstanding	159,760,671	158,234,300

Consolidated_Statements_Of_Ope

Consolidated Statements Of Operations (USD $)	12 Months Ended
In Millions, except Per Share data, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012
Net sales	$1,184.70	$1,120.80	$1,023.90
Cost of sales	836.8	807.6	752.8
Gross profit	347.9	313.2	271.1
Operating expenses:	'	'	'
Selling, general and administrative	220.7	214.4	204.2
Restructuring	3.1	1.5	2.8
Asset Impairment Charges	1.5	'	'
Total operating expenses	223.8	215.9	207
Operating income	124.1	97.3	64.1
Interest expense, net	49.6	51.7	59.9
Loss on early extinguishment of debt	1	1.4	1.5
Net Income Before Income Tax	73.5	44.2	2.7
Income tax expense (benefit)	18	8.8	7.9
Income (loss) from continuing operations	55.5	35.4	-5.2
Income (loss) from discontinued operations, net of tax	0	5.4	-103.2
Net Income (Loss) Attributable to Parent	$55.50	$40.80	($108.40)
Net loss per basic share:	'	'	'
Continuing operations, in dollars per share	$0.35	$0.23	($0.03)
Discontinued operations, in dollars per share	$0	$0.03	($0.66)
Net income (loss) per basic share	$0.35	$0.26	($0.69)
Net loss per diluted share:	'	'	'
Continuing operations, in dollars per share	$0.34	$0.22	($0.03)
Discontinued operations, in dollars per share	$0	$0.03	($0.66)
Net income (loss) per diluted share	$0.34	$0.25	($0.69)
Weighted average shares outstanding:	'	'	'
Basic, in shares	159.2	157.7	156.5
Diluted, in shares	162.2	160.3	156.5
Dividends declared per share, in dollars per share	$0.07	$0.07	$0.07

Consolidated_Statement_of_Comp

Consolidated Statement of Comprehensive Income Statement (USD $)	12 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012
Net Income (Loss) Attributable to Parent	$55.50	$40.80	($108.40)
Other comprehensive income (loss):	'	'	'
Minimum pension liability	45.1	-55.2	39.8
Income tax effects	17.4	6.3	0.4
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	-4.4	-2.4	2.9
Amortization of interest expense on terminated swap contracts	0	0	-5
Income tax effects	0	0	-2
Other Comprehensive Income (Loss), Net of Tax	-32.1	59.1	-33.5
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	$23.40	$99.90	($141.90)

Consolidated_Statement_Of_Stoc

Consolidated Statement Of Stockholders' Equity (USD $)	Total	Common stock	Additional paid-in capital	Accumulated deficit	Accumulated other comprehensive income (loss)	Noncontrolling Interest [Member]
In Millions, unless otherwise specified
Balance at Sep. 30, 2011	$379	$1.60	$1,593.20	($1,161.60)	($54.20)	$0
Increase (Decrease) in Stockholders' Equity [Roll Forward]	'	'	'	'	'	'
Net income (loss)	-108.4	'	'	'	'	'
Net Income (Loss) Attributable to Noncontrolling Interest	'	'	'	'	'	0
Net Income (Loss) Attributable to Parent	-108.4	0	0	-108.4	0	'
Dividends declared	11	0	-11	0	0	0
Stock-based compensation	4.9	0	4.9	0	0	0
Shares retained for employee taxes	-0.5	0	-0.5	0	0	0
Stock issued under stock compensation plans	0.7	0	0.7	0	0	0
Other Comprehensive Income (Loss), Net of Tax	-33.5	0	0	0	-33.5	0
Balance at Sep. 30, 2012	231.2	1.6	1,587.30	-1,270	-87.7	0
Increase (Decrease) in Stockholders' Equity [Roll Forward]	'	'	'	'	'	'
Net income (loss)	40.8	'	'	'	'	'
Net Income (Loss) Attributable to Noncontrolling Interest	'	'	'	'	'	0
Net Income (Loss) Attributable to Parent	40.8	0	0	40.8	0	'
Dividends declared	11	0	-11	0	0	0
Stock-based compensation	6.5	0	6.5	0	0	0
Shares retained for employee taxes	-1.5	0	-1.5	0	0	0
Stock issued under stock compensation plans	3.1	0	3.1	0	0	0
Other Comprehensive Income (Loss), Net of Tax	59.1	0	0	0	59.1	0
Balance at Sep. 30, 2013	328.2	1.6	1,584.40	-1,229.20	-28.6	0
Increase (Decrease) in Stockholders' Equity [Roll Forward]	'	'	'	'	'	'
Net income (loss)	55.4	'	'	'	'	'
Net Income (Loss) Attributable to Noncontrolling Interest	'	'	'	'	'	-0.1
Net Income (Loss) Attributable to Parent	55.5	0	0	'	0	'
Dividends declared	11.2	0	-11.2	0	0	0
Stock-based compensation	8.5	0	8.5	0	0	0
Shares retained for employee taxes	-3.1	0	'	0	0	0
Stock issued under stock compensation plans	4.2	0	4.2	0	0	0
Sale of noncontrolling interest	1.7	0	0	0	0	1.7
Other Comprehensive Income (Loss), Net of Tax	-32.1	0	0	0	-32.1	0
Balance at Sep. 30, 2014	$351.60	$1.60	$1,582.80	($1,173.70)	($60.70)	$1.60

Consolidated_Statements_Of_Cas

Consolidated Statements Of Cash Flows (USD $)	12 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012
Net Income (Loss) Attributable to Parent	$55.50	$40.80	($108.40)
Adjustments to reconcile net income (loss) to income (loss) from continuing operations:	'	'	'
Income (loss) from discontinued operations, net of tax	0	-5.4	103.2
Depreciation	27.3	27.4	29.7
Amortization	29.4	31.8	30.9
Asset Impairment Charges	1.5	'	'
Stock-based compensation expense	8.6	7.1	5.1
Deferred income taxes	15.6	7.3	7.6
Retirement plans	1.5	4.3	4.6
Loss on early extinguishment of debt	1	1.4	1.5
Interest rate swap contracts	0	0	5
Other, net	0.7	2.3	3
Changes in assets and liabilities, net of acquisitions:	'	'	'
Receivables	-16.9	0.9	-17.6
Inventories	11	-25.9	-6
Other current assets and other noncurrent assets	3.6	1.8	13.5
Accounts payable and other liabilities	10.3	20.3	4.7
Net cash provided by (used in) operating activities	147.6	114.1	76.8
Investing activities:	'	'	'
Capital expenditures	-36.9	-36.5	-31.4
Acquisitions, net of cash acquired	-10	-0.2	-1.3
Proceeds from sales of assets	4.7	0.5	0.3
Net cash provided by (used in) investing activities	-42.2	-36.2	-32.4
Financing activities:	'	'	'
Debt paid or repurchased	-55.7	-23.2	-57.2
Dividends paid	-11.2	-11	-11
Common stock issued	4.2	3.1	0.7
Shares retained for employee taxes	-3.1	-1.5	-0.5
Payment of deferred financing fees	0	-0.7	0
Sale of noncontrolling interest	1.7	0	0
Other	-1.1	-2.4	-0.1
Net cash used in financing activities	-65.2	-35.7	-68.1
Effect of currency exchange rate changes on cash	-2.7	-1.2	1.5
Net Cash Provided by (Used in) Discontinued Operations [Abstract]	'	'	'
Operating activities	0	-4.9	-43.3
Investing activities	0	4.5	87.5
Net cash provided by (used in) discontinued operations	0	-0.4	44.2
Net change in cash and cash equivalents	37.5	40.6	22
Cash and cash equivalents at beginning of period	123.6	83	61
Cash and cash equivalents at end of period	$161.10	$123.60	$83

Summary_of_Significant_Account

Summary of Significant Accounting Policies All (Notes)	12 Months Ended
	Sep. 30, 2014
Accounting Policies [Abstract]	'
Significant Accounting Policies [Text Block]	'
	Summary of Significant Accounting Policies
	Revenue Recognition-Revenue is recognized when delivery of products has occurred or services have been rendered and there is persuasive evidence of a sales arrangement, selling prices are fixed or determinable and collectibility is reasonably assured. Revenue is reported net of estimated discounts, returns and rebates as “net sales.”
	In May 2014, the Financial Accounting Standards Board issued new guidance for the recognition of revenue.  This new guidance applies to us beginning with our first quarter of fiscal 2018 and early adoption is not permitted.  We are in the early stages of evaluating the impact of the adoption of this guidance on our financial statements and related disclosures and we have not yet reached any conclusions.
	Shipping and Handling-Costs to ship products to customers are included in cost of sales. Amounts billed to customers, if any, to cover shipping and handling costs are included in net sales.
	Stock-based Compensation-Compensation expense for stock-based awards granted to employees and directors is based on the fair value at the grant dates for most of our outstanding stock-based compensation awards, and is based on the fair value at each reporting date for our Phantom Plan and cash-settled performance share awards. See Note 10 for more information regarding our stock-based compensation. Stock-based compensation expense is a component of selling, general and administrative expenses.
	Cash and Cash Equivalents-All highly liquid investments with remaining maturities of 90 days or less when purchased are classified as cash equivalents. Where there is no right of offset against cash balances, outstanding checks are included in accounts payable.
	Receivables-Receivables are amounts due from customers. To reduce credit risk, credit investigations are generally performed prior to accepting orders from new customers and, when necessary, letters of credit, bonds or other instruments are required to ensure payment.
	The estimated allowance for doubtful receivables is based upon judgments and estimates of expected losses and specific identification of problem accounts. Significantly weaker than anticipated industry or economic conditions could impact customers' ability to pay such that actual losses may be greater than the amounts provided for in this allowance. The periodic evaluation of the adequacy of the allowance for doubtful receivables is based on an analysis of prior collection experience, specific customer creditworthiness and current economic trends within the industries served. In circumstances where we expect a specific customer's inability to meet its financial obligations (e.g., bankruptcy filings or substantial downgrading of credit ratings), we record a specific allowance to reduce the receivable to the amount management reasonably believes will be collected.
	The following table summarizes information concerning our allowance for doubtful receivables.
		2014			2013			2012
		(in millions)
	Balance at beginning of year	$	5.3		$	5.7		$	4.8
	Provision charged to expense	—			0.4			0.6
	Balances written off, net of recoveries	(0.1		)	(0.8		)	(0.1		)
	Other	0.1			—			0.4
	Balance at end of year	$	5.3		$	5.3		$	5.7
	Inventories-Inventories are recorded at the lower of first-in, first-out method cost or market value. We evaluate our inventory in terms of excess and obsolete exposures. This evaluation includes such factors as anticipated usage, inventory turnover, inventory levels and ultimate product sales value. Inventory cost includes an overhead component that is affected by levels of production and actual costs incurred. Management periodically evaluates the effects of production levels and costs capitalized as part of inventory.
	The following table summarizes information concerning our inventory valuation reserves.
		2014			2013			2012
		(in millions)
	Balance at beginning of year	$	10.6		$	12.5		$	12.7
	Provision charged to expense	2.8			2.4			1.8
	Inventory disposed	(4.3		)	(4.6		)	(2.2		)
	Other	(0.6		)	0.3			0.2
	Balance at end of year	$	8.5		$	10.6		$	12.5
	Other Current Assets-Other current assets include maintenance supplies and tooling costs. Costs for perishable tools and maintenance items are expensed when put into service. Costs for more durable items are amortized over their estimated useful lives, ranging from 3 to 10 years.
	Property, Plant and Equipment-Property, plant and equipment is recorded at cost, less accumulated depreciation. Depreciation is recorded using the straight-line method over the estimated useful lives of the assets. Estimated useful lives are 10 to 20 years for land improvements, 10 to 40 years for buildings and 3 to 15 years for machinery and equipment. Leasehold improvements and capitalized leases are depreciated using the straight-line method over the lesser of the useful life of the asset or the remaining lease term. Gains and losses upon disposition are reflected in operating results in the period of disposition.
	Direct internal and external costs to implement computer systems and internal-use software are capitalized. Capitalized costs are depreciated over the estimated useful life of the system or software, generally 3 to 6 years, beginning when site installation or module development is complete and ready for use.
	Liabilities are recognized at fair value for asset retirement obligations related to plant and landfill closures in the period in which they are incurred and the carrying amounts of the related long-lived assets are correspondingly increased. Over time, the liabilities are accreted to their estimated future values. At September 30, 2014 and 2013, asset retirement obligations were $3.2 million and $3.6 million, respectively.
	Accounting for the Impairment of Long-Lived Assets-We test intangible assets that have an indefinite life and goodwill for impairment annually (or more frequently if events or circumstances indicate possible impairment.) We perform our annual impairment testing at September 1. We amortize finite-lived intangible assets over their respective estimated useful lives and review for impairment if events or circumstances indicate possible impairment.
	Workers Compensation-Our exposure to workers compensation claims is generally limited to $1 million per incident. Liabilities, including those related to claims incurred but not reported, are recorded principally using annual valuations based on discounted future expected payments and using historical data combined with insurance industry data when historical data is limited. We are indemnified under an agreement with a predecessor to Tyco for all Mueller Co. and Anvil workers compensation liabilities related to incidents that occurred prior to August 16, 1999. See Note 16. We retained U.S. Pipe workers compensation liabilities related to incidents that occurred prior to April 1, 2012, but the Purchaser has agreed to reimburse us for up to $11.8 million in payments we make related to these liabilities. At September 30, 2014, the remaining reimbursements may be up to $6.5 million, which we have recorded on a discounted basis as $1.6 million in other current assets and $4.0 million in other noncurrent assets. See Note 5. On an undiscounted basis, workers compensation liabilities were $17.0 million and $20.0 million at September 30, 2014 and 2013, respectively. On a discounted basis, workers compensation liabilities were $14.7 million and $17.2 million at September 30, 2014 and 2013, respectively.
	We apply a discount rate at a risk-free interest rate, generally a U.S. Treasury bill rate, for each policy period. The rate used is one with a duration that corresponds to the weighted average expected payout period for each policy period. Once a discount rate is applied to a policy period, it remains the discount rate for that policy period until all claims are paid.
	Warranty Costs-We accrue for warranty expenses that can include customer costs of repair and/or replacement, including labor, materials, equipment, freight and reasonable overhead costs. We accrue for the estimated cost of product warranties at the time of sale if such costs are determined to be reasonably estimable at that time. Warranty cost estimates are revised throughout applicable warranty periods as better information regarding warranty costs becomes available.
	Activity in accrued warranty, reported as part of other current liabilities, is presented below.
		2014			2013			2012
		(in millions)
	Balance at beginning of year	$	2.8		$	1.6		$	2
	Warranty expense	4.1			4.2			1.4
	Warranty payments	(4.3		)	(3.0		)	(1.8		)
	Balance at end of year	$	2.6		$	2.8		$	1.6
	Deferred Financing Fees-Costs of debt financing are charged to expense over the lives of the related financing agreements, which ranged from 5 to 10 years. Remaining costs and the future period over which they would be charged to expense are reassessed when amendments to the related financing agreements or prepayments occur.
	Deferred financing fees of $6.7 million at September 30, 2014 were scheduled to amortize as follows: $2.1 million related to the ABL Agreement amortizes on a straight-line basis; $2.8 million related to the Senior Unsecured Notes amortizes using the effective-interest rate method; and $1.8 million related to the Senior Subordinated Notes amortizes using the effective-interest rate method. All such amortization would have been over the remaining term of the respective debt. See Note 7.
	Derivative Instruments and Hedging Activities-Changes in the fair value of derivative instruments accounted for as effective cash-flow hedges were recorded to accumulated other comprehensive loss. Gains and losses on derivative instruments not qualifying as effective cash-flow hedges, representing hedge ineffectiveness and hedge components excluded from the assessment of effectiveness, were recognized in earnings in the periods in which they occurred.
	Our ongoing business operations expose us to commodity price risk and interest rate risk, which we had previously managed to some extent using derivative instruments. We used natural gas swap contracts at U.S. Pipe to manage the price risk associated with purchases of natural gas used in certain of our manufacturing processes and interest rate swap contracts to manage interest rate risk associated with our variable-rate borrowings. During 2010, we terminated all of our remaining interest rate swap contracts and we reclassified expense related to these swap contracts from accumulated other comprehensive loss to interest expense in 2012. We have not initiated any new interest rate swap contracts since then. During 2012, we terminated our remaining natural gas swap contract and have not initiated any new natural gas swap contracts since then.
	We had designated our natural gas swap contracts and interest rate swap contracts as cash flow hedges of our purchases of natural gas and our interest payments, respectively. As a result, to the extent the hedges were effective, the changes in the fair value of these contracts prior to settlement were reported as a component of accumulated other comprehensive loss and reclassified into earnings in the periods during which the hedged transactions affected, or were expected to affect, earnings.
	Income Taxes-Deferred tax liabilities and deferred tax assets are recognized for the expected future tax consequences of events that have been included in the financial statements or tax returns. Such liabilities and assets are determined based on the differences between the financial statement basis and the tax basis of assets and liabilities, using tax rates in effect for the years in which the differences are expected to reverse. A valuation allowance is provided when, based upon the available evidence, it is more likely than not that some or all of the deferred tax assets will not be realized.
	We only record tax benefits for positions that management believes are more likely than not of being sustained under audit based solely on the technical merits of the associated tax position. The amount of tax benefit recognized for any position that meets the more likely than not threshold is the largest amount of the tax benefit that we believe is greater than 50% likely of being realized.
	Environmental Expenditures-We capitalize environmental expenditures that increase the life or efficiency of noncurrent assets or that reduce or prevent environmental contamination. We accrue for environmental expenses resulting from existing conditions that relate to past operations when the costs are probable and reasonably estimable. We are indemnified under an agreement with a predecessor to Tyco for certain environmental liabilities that existed at August 16, 1999. See Note 16.
	Research and Development-Research and development costs are expensed as incurred.
	Advertising-Advertising costs are expensed as incurred.
	Translation of Foreign Currency-Assets and liabilities of our businesses whose functional currency is other than the U.S. dollar are translated into U.S. dollars using currency exchange rates at the balance sheet date. Revenues and expenses are translated at average currency exchange rates during the period. Foreign currency translation gains and losses are reported as a component of accumulated other comprehensive loss. Gains and losses resulting from foreign currency transactions are included in operating results as incurred.

Identifiable_Intangible_Assets

Identifiable Intangible Assets	12 Months Ended
	Sep. 30, 2014
Goodwill and Intangible Assets Disclosure [Abstract]	'
Identifiable Intangible Assets	'
	Intangible Assets
	Intangible assets are presented below.
		September 30,
		2014			2013
		(in millions)
	Capitalized external-use software:
	Cost	$	14.3		$	12.2
	Accumulated amortization	(5.4		)	(4.3		)
	Net book value	8.9			7.9
	Business combination-related:
	Cost:
	Finite-lived intangible assets:
	Technology	80.4			80.1
	Customer relationships and other	400.2			398.1
	Indefinite-lived intangible assets:
	Trade names and trademarks	300			300
		780.6			778.2
	Accumulated amortization:
	Technology	(68.1		)	(61.5		)
	Customer relationships and other	(193.2		)	(171.5		)
		(261.3		)	(233.0		)
	Net book value	519.3			545.2
	Goodwill	5.4			—
	Total intangible assets net book value	$	533.6		$	553.1
	Direct internal and external costs to develop external-use software are capitalized. Capitalized costs are depreciated over the estimated useful life of the software, beginning when the software is complete and ready for sale. During 2014, we revised our estimate of the useful life of the software to 6 years from 3 years. At September 30, 2014, the remaining weighted-average amortization period for the external-use software was 4.8 years. Amortization expense related to such software assets was $1.1 million, $2.3 million and $1.5 million for 2014, 2013 and 2012, respectively. Amortization expense for each of the next five years is scheduled to be $1.5 million in 2015, $1.8 million in 2016, $1.8 million in 2017, $1.5 million in 2018 and $1.2 million in 2019.
	At September 30, 2014, the remaining weighted-average amortization period for the business combination-related finite-lived intangible assets was 9.1 years. Amortization expense related to theses assets was $28.3 million, $29.5 million and $29.4 million for 2014, 2013 and 2012, respectively. Amortization expense for each of the next five years is scheduled to be $27.7 million in 2015, $22.2 million in 2016, $22.2 million in 2017, $22.4 million in 2018 and $22.3 million in 2019.

Discontinued_Operations_Assets

Discontinued Operations, Assets Held for Sale and Divestitures	12 Months Ended
	Sep. 30, 2014
Discontinued Operations and Disposal Groups [Abstract]	'
Discontinued Operations, Assets Held for Sale and Divestitures	'
	Restructuring and Discontinued Operations
	In 2014, Mueller Co. changed its approach to the production of certain sizes of iron gate valves. This change resulted in an impairment of the related production equipment of $1.5 million, which is reported as restructuring expense. This charge was based on our internal projections of future cash flows associated with the production equipment.
	In 2014, Anvil sold the production equipment and certain inventory at its Bloomington, Minnesota location for an immaterial gain. Anvil also signed a supply agreement with the buyer and terminated the employment of all employees at that location, which resulted in the withdrawal from the only multi-employer pension plan in which the Company had participated. At September 30, 2014, we maintained an accrual for our withdrawal liability of $0.9 million. Also in 2014, Anvil sold certain assets at this location for a gain of $2.5 million, which is included in selling, general and administrative expenses.
	On April 1, 2012, we sold our former U.S. Pipe segment and received proceeds of $94.0 million in cash, subject to adjustments, and the agreement by the purchaser to reimburse us for expenditures to settle certain previously-existing liabilities estimated at $10.1 million at March 31, 2012. During 2013, we received $4.5 million in cash for certain purchase price adjustments and reduced our loss on sale of discontinued operations accordingly.
	The table below represents a summary of the operating results for the U.S. Pipe discontinued operations. These operating results do not reflect what they would have been had U.S. Pipe not been classified as discontinued operations.
		2013			2012
		(in millions)
	Net sales	$	—		$	197
	Cost of sales	—			197.9
	Gross loss	—			(0.9		)
	Operating expenses (income)	(0.5		)	4.2
	Operating income (loss)	0.5			(5.1		)
	Interest expense	—			0.3
	(Income) loss on sale of discontinued operations	(4.9		)	119.7
	Income tax benefit	—			(21.9		)
	Income (loss) from discontinued operations, net of tax	$	5.4		$	(103.2	)
	We have retained certain assets, liabilities and activities previously associated with our former U.S. Pipe segment, including ownership of certain real property and retention of pension and workers compensation obligations. Cash flows associated with some of these items are anticipated to continue indefinitely, but they are not clearly and closely related to the future operations of U.S. Pipe under its new owners.

Income_Taxes

Income Taxes	12 Months Ended
	Sep. 30, 2014
Income Tax Disclosure [Abstract]	'
Income Taxes	'
	Income Taxes
	The components of income (loss) before income taxes are presented below.
		2014			2013			2012
		(in millions)
	U.S.	$	71.6		$	41		$	(0.1	)
	Non-U.S.	1.9			3.2			2.8
	Income before income taxes	$	73.5		$	44.2		$	2.7
	The cumulative amount of undistributed earnings of foreign subsidiaries for which United States income taxes have not been provided was $58.1 million at September 30, 2014. It is not currently practical to estimate the amount of unrecognized United States income taxes that might be payable on the repatriation of these earnings.
	Income tax expense (benefit) from continuing operations is presented below.
		2014			2013			2012
		(in millions)
	Current:
	U.S. federal	$	0.1		$	0.6		$	0.2
	U.S. state and local	1.6			0.1			(1.0		)
	Non-U.S.	0.7			0.8			1.1
		2.4			1.5			0.3
	Deferred:
	U.S. federal	28.7			6.2			(0.6		)
	U.S. state and local	(12.8		)	1.3			9
	Non-U.S.	(0.3		)	(0.2		)	(0.8		)
		15.6			7.3			7.6
	Income tax expense	$	18		$	8.8		$	7.9
	The allocations of current income tax expense (benefit) between continuing and discontinued operations are provided below.
		2014			2013						2012
		Continuing operations			Continuing operations			Discontinued operations			Continuing operations		Discontinued operations
		(in millions)
	Expense from operations	$	30.1		$	17.5		$	2.1		$	1.4	$	(48.7	)
	Valuation allowance-related benefit	(9.6		)	(8.5		)	(2.1		)	6.5		26.7
	Other items	(2.5		)	(0.2		)	—			—		0.1
	Income tax expense	$	18		$	8.8		$	—		$	7.9	$	(21.9	)
	The reconciliation between income tax expense at the U.S. federal statutory income tax rate and reported income tax expense from continuing operations is presented below.
		2014			2013			2012
		(in millions)
	Expense at U.S. federal statutory income tax rate of 35%	$	25.7		$	15.5		$	0.9
	Adjustments to reconcile to income tax expense:
	Federal valuation allowance	(1.2		)	(7.8		)	—
	State income taxes, net of federal benefit	3.6			2			(0.8		)
	State tax rate change	(2.5		)	—			—
	State valuation allowance, net of federal benefit	(8.4		)	(1.1		)	5.9
	Tax credits	(0.1		)	(0.6		)	(0.1		)
	Nondeductible expenses, other than compensation	0.9			0.5			0.7
	Foreign income taxes	(0.2		)	0.4			(0.3		)
	Nondeductible compensation	0.8			0.2			1.4
	Other	(0.6		)	(0.3		)	0.2
	Income tax expense	$	18		$	8.8		$	7.9
	Deferred income tax balances are presented below.
		September 30,
		2014			2013
		(in millions)
	Deferred income tax assets:
	Inventory reserves	$	15.2		$	17.2
	Accrued expenses	15.3			17.2
	Pension and other postretirement benefits	20.3			2.4
	Stock-based compensation	10.7			9.1
	State net operating losses	10.3			13.4
	Federal net operating losses and credit carryovers	6.8			37.4
	Other	1.9			1.6
		80.5			98.3
	Valuation allowance	(0.7		)	(10.3		)
	Total deferred income tax assets, net of valuation allowance	79.8			88
	Deferred income tax liabilities:
	Intangible assets	190.1			199.8
	Other	1.5			3
Total deferred income tax liabilities	191.6			202.8
Net deferred income tax liabilities	$	111.8		$	114.8
We reevaluate the need for a valuation allowance against the U.S. deferred tax assets each quarter, considering results to date, projections of taxable income, tax planning strategies and reversing taxable temporary differences.
After inclusion of the tax effect of the loss on the sale of U.S. Pipe in 2012, our net reversing deferred tax credits were insufficient to fully support our deferred tax assets, which include net operating loss carryforwards, and we concluded that a valuation allowance was necessary to reduce our U.S. net reversing deferred tax assets to zero. Accordingly, we recorded income tax expense in 2012 to establish valuation allowances related to deferred tax assets. We allocated a portion of the valuation allowance charge relating to these deferred tax assets at September 30, 2011 to continuing operations, with the remaining valuation allowances charged against minimum pension liability in accumulated other comprehensive loss and to discontinued operations. In the 2014 fourth quarter, we credited to income almost all of the deferred tax valuation allowance based on our expectation of future taxable income.
The allocations of the valuation allowance charge among continuing operations, discontinued operations, and accumulated other comprehensive loss are presented below.
	2014			2013
	(in millions)
Balance at beginning of year	$	10.3		$	49.2
Decrease allocated to continuing operations	(9.6		)	(8.5		)
Decrease allocated to discontinued operations	—			(2.1		)
Decrease allocated to accumulated other comprehensive loss	—			(27.8		)
Expired items	—			(0.5		)
Balance at end of year	$	0.7		$	10.3
Notwithstanding the valuation allowance, our federal and state net operating loss carryforwards remain available to offset future taxable earnings. Our state net operating losses expire between 2015 and 2033. Our federal net operating losses expire between 2031 and 2032.
The following table summarizes information concerning our gross unrecognized tax benefits.
	2014			2013
	(in millions)
Balance at beginning of year	$	3.7		$	4.3
Increases related to prior year positions	—			0.5
Decreases due to lapse in statute of limitations	(1.0		)	(1.1		)
Balance at end of year	$	2.7		$	3.7
Substantially all unrecognized tax benefits would, if recognized, impact the effective tax rate. We recognize interest related to uncertain tax positions as interest expense and recognize any penalties incurred as a component of selling, general and administrative expenses. At September 30, 2014 and 2013, we had $0.7 million and $0.9 million, respectively, of accrued interest expense related to unrecognized tax benefits.
We expect to settle certain state income tax audits within the next 12 months and believe it is reasonably possible that these audit settlements will reduce the gross unrecognized tax benefits by $0.8 million.
The federal income tax returns for Mueller Co. and Anvil are closed for years prior to 2005 and for Mueller Water Products, Inc. for 2007 and 2008. Our 2009 return is closed except to the extent net operating losses from that year are utilized in later years. U.S. Pipe is subject to statute extension agreements that may be applicable to Walter Energy, and we remain liable for any tax related to U.S. Pipe pursuant to the terms of our sale of that segment. See Note 16. During 2012, the IRS completed its audit of our income tax returns filed for 2010, 2009, 2008 and 2007. The IRS audit resulted in zero additional tax liability.
Our state income tax returns are generally closed for years prior to 2007, except to the extent of our state net operating loss carryforwards. Our Canadian income tax returns are generally closed for years prior to 2007. We are currently under audit by several states at various levels of completion. We do not have any material unpaid assessments.

Borrowing_Arrangements

Borrowing Arrangements	12 Months Ended
	Sep. 30, 2014
Long-term Debt and Capital Lease Obligations [Abstract]	'
Borrowing Arrangements	'
	Borrowing Arrangements
	On November 25, 2014, we entered into a $500.0 million senior secured term loan (“Term Loan”). The proceeds from the Term Loan, along with other cash, were used to fund the tender and call of our 7.375% Senior Subordinated Notes (“Senior Subordinated Notes”) and 8.75% Senior Unsecured Notes (“Senior Unsecured Notes”), or the satisfaction and discharge of any such notes not tendered or called, in connection with the refinancing of such indebtedness. The Term Loan accrues interest at a floating rate equal to LIBOR, subject to a floor of 0.75%, plus 325 basis points. We may voluntarily repay amounts borrowed under the Term Loan at any time. The principal amount of the Term Loan is required to be repaid in quarterly installments, commencing in March 2015, of $1.25 million. The Term Loan has a term of seven years. The Term Loan is guaranteed by substantially all of our U.S. subsidiaries and secured by essentially all of our assets, though the ABL Agreement described below has a senior claim on certain collateral securing borrowings thereunder.
	The Term Loan contains customary representations and warranties and does not contain any financial maintenance covenants. The Term Loan contains customary affirmative and negative operating covenants applicable to us and our restricted subsidiaries, including, among other things, restrictions on indebtedness, disqualified and preferred stock issuances, restricted payments, dividends, asset sales, transactions with affiliates, liens, fundamental changes, negative pledges, line of business changes and amendments to organizational documents. The Term Loan also includes customary events of default, including but not limited to, the nonpayment of principal or interest, material inaccuracy of representations and warranties, violations of covenants, cross-default to material indebtedness, bankruptcy and insolvency, material adverse judgments and lien priority. Upon an event of default, the lenders may, among other things, accelerate the Term Loan and foreclose on the collateral. We believe we were compliant with these covenants at November 25, 2014 and expect to remain in compliance through September 30, 2015.
	We paid approximately $50 million in costs related to the refinancing, which resulted in a loss on early extinguishment of debt, including the write-off of all related deferred finance fees and original issue discount, of approximately $31.3 million for the quarter ending December 31, 2014. We expect to capitalize approximately $8 million of these costs, which will be amortized over the term of the Term Loan using the effective interest rate method.
	Concurrent with our entry into the Term Loan, we amended our ABL Agreement and certain security documents related thereto to provide that our obligations under the ABL Agreement, which were previously secured by a first-priority lien on all of our U.S. receivables and inventory, certain cash and other supporting obligations, shall be secured by a second-priority lien on substantially all of our remaining assets.
	The components of our long-term debt are presented below.
		September 30,
		2014			2013
		(in millions)
	ABL Agreement	$	—		$	—
	Senior Subordinated Notes	365			420
	Senior Unsecured Notes	178.3			178
	Other	2.3			2.8
		545.6			600.8
	Less current portion	(46.2		)	(1.3		)
	Long-term debt	$	499.4		$	599.5
	ABL Agreement. At September 30, 2014, our asset based lending agreement (“ABL Agreement”) consisted of a revolving credit facility for up to $225 million of revolving credit borrowings, swing line loans and letters of credit. The ABL Agreement also permits us to increase the size of the credit facility by an additional $150 million in certain circumstances subject to adequate borrowing base availability. We may borrow up to $25 million through swing line loans and may have up to $60 million of letters of credit outstanding.
	Borrowings under the ABL Agreement bear interest at a floating rate equal to LIBOR plus a margin ranging from 175 to 225 basis points, or a base rate, as defined in the ABL Agreement, plus a margin ranging from 75 to 125 basis points. At September 30, 2014 the applicable rate was LIBOR plus 175 basis points.
	The ABL Agreement terminates on December 18, 2017. We pay a commitment fee for any unused borrowing capacity under the ABL Agreement of either 37.5 basis points per annum or 25 basis points per annum, based on daily average availability during the previous calendar quarter. At September 30, 2014, our commitment fee was 37.5 basis points. Borrowings are not subject to any financial maintenance covenants unless excess availability is less than the greater of $22.5 million and 10% of the aggregate commitments under the ABL Agreement. Excess availability based on September 30, 2014 data, as reduced by outstanding letters of credit and accrued fees and expenses of $29.1 million, was $158.3 million
	Senior Unsecured Notes. The Senior Unsecured Notes would have matured on September 1, 2020 and bore interest at 8.75%, paid semi-annually. The Senior Unsecured Notes balance at September 30, 2014 was net of $1.7 million of unamortized discount. The Senior Unsecured Notes were guaranteed by essentially all of our U.S. subsidiaries, but were subordinate to borrowings under the ABL Agreement. Based on quoted market prices, the outstanding Senior Unsecured Notes had a fair value of $193.5 million at September 30, 2014.
	During 2013, we redeemed $22.5 million aggregate principal amount of the Senior Unsecured Notes at a redemption price of 103% and recorded a loss on early extinguishment of debt of $1.4 million.
	The indenture securing the Senior Unsecured Notes contained customary covenants and events of default, including covenants that limited our ability to incur debt, pay dividends and make investments. We believe we were compliant with these covenants at September 30, 2014 and expected to remain in compliance through September 30, 2015.
	Senior Subordinated Notes. The Senior Subordinated Notes would have matured on June 1, 2017 and bore interest at 7.375%, paid semi-annually. Based on quoted market prices, the outstanding Senior Subordinated Notes had a fair value of $369.6 million at September 30, 2014.
	On August 29, 2014, we redeemed $55.0 million principal amount of the Senior Subordinated Notes at a redemption price of 101.229%. We recorded a loss on early extinguishment of debt of $1.0 million, including deferred financing costs that were written off.
	The indenture securing the Senior Subordinated Notes contained customary covenants and events of default, including covenants that limited our ability to incur debt, pay dividends and make investments. We believe we were compliant with these covenants at September 30, 2014 and expected to remain in compliance through September 30, 2015.
	The scheduled maturities of outstanding borrowings outstanding at September 30, 2014 for each of the following years are $46.2 million for 2015, $0.8 million for 2016, $320.3 million for 2017, none for 2018, none for 2019 and $180.0 million after 2019. As a result of the transactions described above, current maturities of outstanding borrowings are $50.0 million in 2015, $5.8 million in 2016, $5.3 million in 2017, $5.0 million in 2018, $5.0 million in 2019 and $476.2 million after 2019.

Retirement_Plans

Retirement Plans	12 Months Ended
	Sep. 30, 2014
Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract]	'
Pension and Other Postretirement Benefits Disclosure	'
	Retirement Plans
	We have various pension plans (“Pension Plans”), which we fund in accordance with their requirements and, where applicable, in amounts sufficient to satisfy the minimum funding requirements of applicable laws. The Pension Plans provide benefits based on years of service and compensation or at stated amounts for each year of service.
	We formerly provided certain postretirement benefits other than pensions, primarily healthcare, to eligible retirees. Our postretirement benefit plans were funded as benefits were paid.
	On April 1, 2012, we changed certain provisions of our pension and postretirement benefit plans affecting U.S. Pipe participants in these plans. These changes vested all accumulated pension benefits and then froze the plan such that no additional pension benefits would accumulate. Postretirement medical benefits ceased on December 31, 2012. Related to this cessation of benefits, we recorded a benefit of $7.4 million, which is included in income from discontinued operations in 2013. During 2012, we recorded a pension curtailment expense of $0.2 million and an other postretirement benefit plan curtailment gain of $2.4 million, which was included in loss from discontinued operations for 2012.
	The measurement date for all Pension Plans and other postretirement benefit plans was September 30.
	We were not required to make, and we did not make, any contributions to our U.S. pension plan in 2014. We currently estimate we will contribute approximately $1 million to our Pension Plans in 2015.
	The components of net periodic benefit cost are presented below.
		2014				2013				2012
		(in millions)
	Service cost	$	1.7			$	2			$	1.8
	Interest cost	19.9				18.3				20.2
	Expected return on plan assets	(23.8		)		(25.1		)		(24.0		)
	Amortization of prior service cost	—				—				0.6
	Amortization of net loss	3.5				9				6
	Curtailment / special settlement loss	0.1				0.1				0.2
	Costs allocated to discontinued operations	—				—				(1.1		)
	Other	0.1				—				—
	Net periodic benefit cost	$	1.5			$	4.3			$	3.7
	Balance sheet information for Pension Plans with accumulated benefit obligations in excess of plan assets is presented below.
		September 30,
		2014				2013
		(in millions)
	Projected benefit obligations	$	459.9			$	390.4
	Accumulated benefit obligations	459.9				390.4
	Fair value of plan assets	407.6				384.8
	Balance sheet information for Pension Plans with accumulated benefit obligations less than plan assets is presented below.
		September 30,
		2014				2013
		(in millions)
	Projected benefit obligations	$	1.6			$	9.2
	Accumulated benefit obligations	1.6				9.1
	Fair value of plan assets	2.9				10.4
	Amounts recognized for our Pension Plans and other postretirement benefit plans are presented below.
		Pension Plans								Other Plans
		2014				2013				2013
		(in millions)
	Projected benefit obligations:
	Beginning of year	$	399.6			$	448.3			$	0.2
	Service cost	1.7				2				—
	Interest cost	19.9				18.3				—
	Actuarial loss (gain)	67.3				(42.5		)		—
	Benefits paid	(26.0		)		(26.0		)		(0.2		)
	Currency translation	(0.8		)		(0.5		)		—
	Decrease in obligation due to curtailment	(0.2		)		—				—
	End of year	$	461.5			$	399.6			$	—
	Accumulated benefit obligations at end of year	$	461.5			$	399.5			$	—
	Plan assets:
	Beginning of year	$	395.2			$	387.1			$	—
	Actual return on plan assets	42.1				34.4				—
	Employer contributions	0.1				0.2				0.2
	Currency translation	(0.9		)		(0.5		)		—
	Benefits paid	(26.0		)		(26.0		)		(0.2		)
	End of year	$	410.5			$	395.2			$	—
	Accrued benefit cost at end of year:
	Unfunded status	$	(51.0	)		$	(4.4	)		$	—
	Recognized on balance sheet:
	Other noncurrent assets	$	1.3			$	1.3			$	—
	Other noncurrent liabilities	(52.3		)		(5.7		)		—
		$	(51.0	)		$	(4.4	)		$	—
	Recognized in accumulated other comprehensive loss, before tax:
	Prior year service cost	$	0.1			$	0.2			$	—
	Net actuarial loss	119.7				74.5				—
		$	119.8			$	74.7			$	—
Change in actuarial loss (gain) in 2014 is due to actual rates of return on plans assets being lower than projected and the adoption of new mortality tables issued by the Society of Actuaries due to the increasing lifespan of North Americans.
Our U.S. plan comprised 98% of the Pension Plans' obligations and 97% of the Pension Plans' assets at September 30, 2014.
Pension Plan activity in accumulated other comprehensive loss, before tax, in 2014 is presented below, in millions.
Balance at beginning of year	$	74.7
Actuarial gain	48.9
Prior year service loss amortization to net periodic cost	(3.5		)
Other	(0.3		)
Balance at end of year	$	119.8
Beginning in 2015, we will amortize amounts in accumulated other comprehensive loss representing unrecognized prior year service cost and unrecognized loss related to our U.S. pension plan over the weighted average life expectancy of the plan's inactive participants instead of the weighted average remaining service period for active participants, as we have done through 2014. We do not expect the effect of this change to be material to our consolidated financial statements. The components of accumulated other comprehensive loss related to pension that we expect to amortize into net periodic benefit cost in 2015 are presented below, in millions.
Amortization of unrecognized prior year service cost	$	—
Amortization of unrecognized loss	3.2
	$	3.2
The discount rates for determining the present value of pension obligations were selected using a “bond settlement” approach, which constructs a hypothetical bond portfolio that could be purchased such that the coupon payments and maturity values could be used to satisfy the projected benefit payments.  The discount rate is the equivalent rate that results in the present value of the projected benefit payments equaling the market value of this bond portfolio. Only high quality (AA graded or higher), non-callable corporate bonds are included in this bond portfolio.  We rely on the Pension Plans' actuaries to assist in the development of the discount rate model.
Separate discount rates were selected for different plans due to differences in the timing of projected benefit payments. The discount rate model for the plan covering participants in the United States reflected yields available on investments in the United States, while plans covering participants in Canada reflected yields available on investments in Canada. The discount rate for the other postretirement benefit plans was remeasured at April 1, 2012 to 5.00%.
Management's expected returns on plan assets and assumed healthcare cost trend rates were determined with the assistance of the Pension Plans' actuaries and investment consultants. Expected returns on plan assets were developed using forward looking returns over a time horizon of 10 to 15 years for major asset classes along with projected risk and historical correlations.
A summary of key assumptions for our pension and other postretirement benefit plans is below.
	Pension Plans									Other Plans
	2014			2013			2012			2013		2012
Weighted average used to determine benefit obligations:
Discount rate	4.49	%		5.16	%		4.21	%		n/a		4.22	%
Rate of compensation increases	3.5			3.5			3.5			n/a		n/a
Weighted average used to determine net periodic cost:
Discount rate	5.16	%		4.21	%		5.66	%		n/a		5.69	%
Expected return on plan assets	6.24			6.71			6.95			n/a		n/a
Rate of compensation increases	3.5			3.5			3.5			n/a		n/a
Assumed discount rates, expected return on plan assets and salary increases affect the amounts reported for the Pension Plans. The effects of a one-percentage-point change in the trend rate for these assumptions are below.
	1 Percentage				1 Percentage
	point increase				point decrease
	(in millions)
Discount rate:
Effect on pension service and interest costs	$	(0.1	)		$	0.7
Effect on pension benefit obligations	(50.3		)		61.8
Effect on 2015 service and interest costs	(0.5		)		0.5
Expected return on plan assets:
Effect on 2015 service and interest costs	(4.0		)		4
We maintain a single trust to hold the assets of the U.S. pension plan. During 2013, the strategic asset allocation was adjusted to 40% equity investments from 60% equity investments. This trust's strategic asset allocations, tactical range at September 30, 2014 and actual asset allocations are presented below.
	Strategic asset allocation							Actual asset allocations at
								September 30,
				Tactical range				2014			2013			2012
Equity investments:
Large capitalization stocks	26	%
Small capitalization stocks	5
International stocks	9
	40			30	-	50%		40	%		40	%		59	%
Fixed income investments	60			50	-	70		59			59			39
Cash	—			0	-	5		1			1			2
	100	%						100	%		100	%		100	%
Assets of the Pension Plans are allocated to various investments to attain diversification and reasonable risk-adjusted returns while also managing the exposure to asset and liability volatility. These ranges are targets and deviations may occur from time to time due to market fluctuations. Portfolio assets are typically rebalanced to the allocation targets at least annually. The valuation methodologies used to measure the assets of the Pension Plans at fair value are:
•	Equity investments are valued at the closing price reported on the active market when reliable market quotations are readily available. When market quotations are not readily available, assets of the Pension Plans are valued by a method the trustees of the Pension Plans believe accurately reflects fair value;
•	Fixed income fund investments are valued using the closing price reported in the active market in which the investment is traded or based on yields currently available on comparable securities of issuers with similar credit ratings; and
•	Other investments are valued as determined by the trustees of the Pension Plans based on their net asset values and supported by the value of the underlying securities and by the unit prices of actual purchase and sale transactions occurring at or close to the financial statement date.
The assets of the Pension Plans by level within the fair value hierarchy are presented below.
	September 30, 2014
	Level 1				Level 2				Total
	(in millions)
Equity:
Large cap stocks:
Large cap growth funds	$	—			$	31.5			$	31.5
Large cap index funds	—				35.9				35.9
Large cap value funds	—				15.3				15.3
Small cap stocks:
Small cap growth funds	—				18.5				18.5
International stocks:
Mutual funds	45.9				—				45.9
International funds	—				15.4				15.4
Total equity	45.9				116.6				162.5
Fixed income	—				243.5				243.5
Cash and cash equivalents	4.5				—				4.5
	$	50.4			$	360.1			$	410.5
	September 30, 2013
	Level 1				Level 2				Total
	(in millions)
Equity:
Large cap stocks:
Large cap growth funds	$	—			$	31.7			$	31.7
Large cap index funds	—				26.1				26.1
Large cap value funds	—				16.3				16.3
Large cap growth mutual funds	16.1				—				16.1
Small cap stocks:
Small cap growth funds	—				23.5				23.5
International stocks:
Mutual funds	31.5				—				31.5
International funds	—				15.7				15.7
Total equity	47.6				113.3				160.9
Fixed income	—				229.8				229.8
Cash and cash equivalents	4.5				—				4.5
	$	52.1			$	343.1			$	395.2
Our estimated future pension benefit payments are presented below in millions.
2015	$	27.6
2016	26.8
2017	27
2018	27.3
2019	27.5
2020-2024	141
Defined Contribution Retirement Plans-Certain of our employees participate in defined contribution 401(k) plans or similar non-U.S plans. We make matching contributions as a function of employee contributions. Matching contributions were $5.6 million, $5.1 million and $4.7 million during 2014, 2013 and 2012, respectively.

Capital_Stock

Capital Stock	12 Months Ended
	Sep. 30, 2014
Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract]	'
Stockholders' Equity Note Disclosure	'
	Capital Stock
	Common stock share activity is presented below.
	Shares outstanding at September 30, 2011	155,793,612
	Exercise of stock options	8,552
	Exercise of employee stock purchase plan instruments	339,242
	Vesting of restricted stock units, net of shares withheld for taxes	699,242
	Shares outstanding at September 30, 2012	156,840,648
	Exercise of stock options	384,475
	Exercise of employee stock purchase plan instruments	290,173
	Vesting of restricted stock units, net of shares withheld for taxes	719,004
	Shares outstanding at September 30, 2013	158,234,300
	Exercise of employee stock purchase plan instruments	204,360
	Exercise of stock options	587,964
	Vesting of restricted stock units, net of shares withheld for taxes	734,047
	Shares outstanding at September 30, 2014	159,760,671

Stockbased_Compensation_Plans

Stock-based Compensation Plans	12 Months Ended
	Sep. 30, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]	'
Disclosure of Compensation Related Costs, Share-based Payments [Text Block]	'
	Stock-based Compensation Plans
	The effect of stock-based compensation on our statements of operations is presented below.
		2014				2013				2012
		(in millions, except per share data)
	Decrease in operating income	$	13.2			$	11.4			$	6
	Decrease in net income or increase in net loss	8.1				6.9				3.5
	Effect on earnings or loss per basic share	0.05				0.04				0.02
	Effect on earnings or loss per diluted share	0.05				0.04				0.02
	We excluded 1,103,845 and 1,387,198 instruments from the calculation of diluted earnings per share for 2014 and 2013, respectively, because the effect of including them would have been antidilutive. We recorded a net loss for 2012, therefore, all stock-based compensation instruments were excluded from the diluted loss per share calculation since their inclusion would have been antidilutive.
	At September 30, 2014, there was approximately $3.2 million of unrecognized compensation expense related to stock-based awards not yet vested. We expect to recognize this expense over a weighted average life of approximately 1.10 years.
	The Mueller Water Products, Inc. 2006 Stock Incentive Plan (“2006 Plan”) authorizes an aggregate of 20,500,000 shares of common stock that may be granted through the issuance of stock-based awards. Any awards canceled are available for reissuance. Generally, all of our employees and members of our board of directors are eligible to participate in the 2006 Plan. At September 30, 2014, 7,001,763 shares of common stock were available for future grants of awards under the 2006 Plan. This total assumes that the maximum number of shares will be earned for awards for which the final number of shares to be earned has not yet been determined.
	An award granted under the 2006 Plan vests at such times and in such installments as set by the Compensation and Human Resources Committee of the board of directors, but no award will be exercisable after the ten-year anniversary of the date on which it is granted. Management expects some instruments will be forfeited prior to vesting. Grants to members of our board of the directors are expected to vest fully. Based on historical forfeitures, we expect grants to others to be forfeited at an annual rate of 2%.
	Restricted Stock Units. Depending on the specific terms of each award, restricted stock units generally vest on the three-year anniversary of the grant date, or ratably over the life of the award, usually three years, on each anniversary date of the original grant. Restricted stock units granted since November 2007 also vest upon the Retirement (as defined in the 2006 Plan) of a participant. Compensation expense for restricted stock units is recognized between the grant date and the vesting date (or the date on which a participant becomes Retirement-eligible, if sooner) on a straight-line basis for each tranche of each award. Fair values of restricted stock units are determined using the closing price of our common stock on the respective dates of grant.
	Restricted stock unit activity under the 2006 Plan is summarized below.
		Restricted stock units			Weighted				Weighted		Aggregate
					average				average		intrinsic
					grant date fair value per unit				remaining		value
									contractual		(millions)
									term (years)
	Outstanding at September 30, 2011	2,065,766			$	6.11			1.6
	Granted	1,406,318			2.19
	Vested	(867,451	)		5.44						$	2.2
	Cancelled	(180,871	)		5.33
	Outstanding at September 30, 2012	2,423,762			4.13				1
	Granted	509,338			5.37
	Vested	(995,037	)		4.77						5.6
	Cancelled	(12,723	)		12.28
	Outstanding at September 30, 2013	1,925,340			4.3				0.9
	Granted	381,012			8.51
	Vested	(1,099,591	)		4.94						9.4
	Cancelled	—			—
	Outstanding at September 30, 2014	1,206,761			$	5.04			0.7
	Performance Shares. Performance-based restricted stock units ("PRSUs") represent a target number of units that may be paid out at the end of a multi-year award cycle consisting of annual performance periods coinciding with our fiscal years. As determined at the date of grant, PRSUs may settle in cash-value equivalent of, or directly in, shares of our common stock. Settlement will range from zero to two times the number of PRSUs granted, depending on our financial performance against predetermined targets. Performance goals are established within 90 days of the beginning of each performance period by the Compensation and Human Resources Committee of our board of directors ("Committee"). At the end of each annual performance period, the Committee certifies performance against the applicable performance targets. PRSUs do not convey voting rights or earn dividends. PRSUs vest on the last day of an award cycle, unless vested sooner due to a "Change of Control" of the Company, or the death, disability or Retirement of a participant.
	The 243,992 cash-settled PRSUs granted in 2013 will settle in December 2014. Outstanding cash-settled PRSUs had a fair value of $8.28 per share at September 30, 2014 and our liability for cash-settled PRSUs was $4.0 million at September 30, 2014. Compensation expense for cash-settled PRSU's has been recognized over the applicable performance periods based on the estimated performance factor and the closing price of our common stock at each balance sheet date.
	The stock-settled PRSUs granted in 2013 and 2014 will be settled in November 2015 and December 2016, respectively. Compensation expense for stock-settled PRSU's is recognized over the applicable performance periods based on the estimated performance factors and the closing price of our common stock on the date each performance goal is established. The stock prices used to value the awards were $5.22 for the 2013 performance period and $8.52 for the 2014 performance period. Stock-settled PRSUs activity under the 2006 Plan is summarized below.
	Award date		Performance period		Units awarded			Shares earned
	27-Nov-12		2013		135,553			271,106
			2014		135,553			271,106
			2015		135,552			—
	3-Dec-13		2014		90,841			181,682
			2015		90,841			—
			2016		90,849			—
	Stock Options. Outstanding stock options generally vest on each anniversary date of the original grant ratably over three years. Stock options granted since November 2007 also vest upon the Retirement of a participant. Compensation expense for stock options is recognized between the grant date and the vesting date (or the date on which a participant becomes Retirement-eligible, if sooner) on a straight-line basis for each tranche of each award. Stock option activity under the 2006 Plan is summarized below.
		Options			Weighted				Weighted		Aggregate
					average				average		intrinsic
					exercise				remaining		value
					price				contractual		(millions)
					per option				term (years)
	Outstanding at September 30, 2011	5,625,133			$	6.74			7.5		$	—
	Granted	677,117			2.18
	Exercised	(8,552	)		3.59						—
	Cancelled	(771,088	)		5.97
	Outstanding at September 30, 2012	5,522,610			6.3				6.8		3.5
	Granted	125,780			5.91
	Exercised	(384,475	)		4.97						1.2
	Cancelled	(139,209	)		12.52
	Outstanding at September 30, 2013	5,124,706			6.22				5.9		14.6
	Granted	86,904			8.58
	Exercised	(587,964	)		4.61						—
	Cancelled	(71,411	)		12.92
	Outstanding at September 30, 2014	4,552,235			$	6.37			5		$	13.6
	Exercisable at September 30, 2014	4,151,589			$	6.56			4.8		$	12
	Expected to vest after September 30, 2014	400,136			$	4.32			7.9		$	1.6
Stock option exercise prices are equal to the closing price of our common stock on the relevant grant date. The ranges of exercise prices for stock options outstanding at September 30, 2014 are summarized below.
Exercise price										Options		Weighted		Weighted	Exercisable options	Weighted
												average		average		average
												exercise price		remaining		exercise price
														contractual
														term (years)
	$	0		-	$	4.99				1,803,311		$	3.23	6.4	1,565,034	$	3.37
	$	5		-	$	9.99				1,801,805		5.85		5	1,639,436	5.7
	$	10		-	$	14.99				656,276		11.84		2.7	656,276	11.84
	$	15		-	$	20.99				290,843		16.71		1.8	290,843	16.71
										4,552,235		$	6.37	5	4,151,589	$	6.56
Compensation expense attributed to stock options is based on the fair value of the awards on their respective grant dates, as determined using a Black-Scholes model. The weighted average grant-date fair values of stock options granted and the weighted average assumptions used to determine these fair values are indicated below.
	2014				2013				2012
Grant-date fair value	$	5.13			$	5.91			$	1.31
Risk-free interest rate	2.44		%		1.63		%		1.74		%
Dividend yield	1.1		%		2.17		%		1.97		%
Expected life (years)	8				8				8
Expected annual volatility	0.6386				0.6696				0.7342
The risk-free interest rate is based on the U.S. Treasury zero-coupon yield in effect at the grant date with a term equal to the expected life. The expected dividend yield is based on our estimated annual dividend and stock price history at the grant date. The expected term represents the period of time the awards are expected to be outstanding.
Employee Stock Purchase Plan. The Mueller Water Products, Inc. 2006 Employee Stock Purchase Plan (“ESPP”) authorizes the sale of up to 4,000,000 shares of our common stock to employees. Generally, all full-time, active employees are eligible to participate in the ESPP, subject to certain restrictions. Employee purchases are funded through payroll deductions, and any excess payroll withholdings are returned to the employee. The price for shares purchased under the ESPP is the lower of 85% of closing price on the first day or the last day of the offering period. At September 30, 2014, 1,631,229 shares were available for issuance under the ESPP.
Phantom Plan. In 2012, the Company adopted the Mueller Water Products, Inc. Phantom Plan (“Phantom Plan”). The Phantom Plan awards were awarded to certain non-officer employees. Outstanding phantom awards vest ratably on each anniversary date of the original grant for three years. Compensation expense for Phantom Plan awards is charged against income on a straight-line basis for each tranche of each award based on the closing price of our common stock at each balance sheet date. Phantom Plan awards are payable in cash and recorded as liability awards. The outstanding Phantom Plan awards had a fair value of $8.28 per award at September 30, 2014 and our liability for such awards was $3.4 million. Phantom Plan activity for 2014 is summarized below.
	Phantom Plan units			Weighted				Weighted		Aggregate
				average				average		intrinsic
				grant date				remaining		value
				fair value				contractual		(millions)
				per unit				term (years)
Outstanding at September 30, 2011	—
Granted	358,866			$	2.03
Vested	—									$	—
Cancelled	—			—
Outstanding at September 30, 2012	358,866			2.03				1.2
Granted	382,605			5.22
Vested	(119,637	)								0.7
Cancelled	(12,852	)		2.03
Outstanding at September 30, 2013	608,982			4.03				1
Granted	304,815			8.52
Vested	(240,739	)								2.1
Cancelled	(29,770	)		5.29
Outstanding at September 30, 2014	643,288			$	6.22			0.8

Supplemental_Balance_Sheet_Inf

Supplemental Balance Sheet Information	12 Months Ended
	Sep. 30, 2014
Balance Sheet Related Disclosures [Abstract]	'
Supplemental Balance Sheet Information	'
	Supplemental Balance Sheet Information
	Selected supplemental balance sheet information is presented below.
		September 30,
		2014			2013
		(in millions)
	Inventories:
	Purchased components and raw material	$	72		$	75.4
	Work in process	34.5			38.6
	Finished goods	91.5			94.5
		$	198		$	208.5
	Other current assets:
	Maintenance and repair tooling	$	22.6		$	22.5
	Income taxes	13			14.9
	U.S. Pipe-related workers' compensation and other reimbursements	1.6			2.2
	Other	6.9			6.5
		$	44.1		$	46.1
	Property, plant and equipment:
	Land	$	9.6		$	10.6
	Buildings	78			75.5
	Machinery and equipment	332.9			305.7
	Construction in progress	18.7			19.6
		439.2			411.4
	Accumulated depreciation	(292.9		)	(269.5		)
		$	146.3		$	141.9
	Other current liabilities:
	Compensation and benefits	$	39.5		$	37.3
	Customer rebates	16.9			15.5
	Interest	10.7			12
	Taxes other than income taxes	4.7			5
	Warranty	2.6			2.8
	Income taxes	0.7			1.3
	Restructuring	0.9			—
	Environmental	0.1			0.2
	Other	6.1			6.5
		$	82.2		$	80.6

Supplemental_Statement_of_Oper

Supplemental Statement of Operations Information	12 Months Ended
	Sep. 30, 2014
Supplemental Income Statement Elements [Abstract]	'
Statement of Operations, Supplemental Disclosures [Text Block]	'
	Supplemental Statement of Operations Information
	Selected supplemental statement of operations information is presented below.
		2014			2013			2012
		(in millions)
	Included in selling, general and administrative expenses:
	Research and development	$	14.4		$	14.8		$	12.7
	Advertising	$	4.7		$	5		$	4.9
	Interest expense, net:
	7.375% Senior Subordinated Notes	$	30.6		$	31		$	31
	8.75% Senior Unsecured Notes	16			16.8			19.3
	Deferred financing fees amortization	2			2			2.3
	ABL Agreement	1.2			1.5			3.2
	Interest rate swap contracts	—			—			5
	Other interest expense	0.2			0.7			(0.6		)
		50			52			60.2
	Interest income	(0.4		)	(0.3		)	(0.3		)
		$	49.6		$	51.7		$	59.9

Supplemental_Cash_Flow_Informa

Supplemental Cash Flow Information	12 Months Ended
	Sep. 30, 2014
Supplemental Cash Flow Information [Abstract]	'
Cash Flow, Supplemental Disclosures [Text Block]	'
	Supplemental Cash Flow Information
	The impact these transactions had on our consolidated balance sheets is presented below.
		September 30,
		2014			2013			2012
		(in millions)
	Pension and other postretirement plans:
	Increase (decrease) in other noncurrent assets	$	—		$	0.3		$	(0.1	)
	Decrease (increase) in other noncurrent liabilities	(25.5		)	51.5			(36.2		)
	Decrease (increase) in other current liabilities	0.1			—			0.3
	Decrease (increase) in deferred tax liabilities	9.8			(20.1		)	(0.6		)
	Decrease (increase) in accumulated other comprehensive loss	15.6			(31.7		)	36.6
		$	—		$	—		$	—
	Cash paid (received), net:
	Interest	$	48.7		$	49.1		$	53.3
	Income taxes	$	2.6		$	0.7		$	(6.9	)

Segment_Information

Segment Information	12 Months Ended
	Sep. 30, 2014
Segment Reporting [Abstract]	'
Segment Reporting Disclosure [Text Block]	'
	Segment Information
	Our operations consist of two business segments: Mueller Co. and Anvil. These segments are organized primarily based on products sold and customers served and are consistent with how the segments are managed, how resources are allocated and how information is used by the chief operating decision maker. Mueller Co. manufactures valves for water and gas systems including butterfly, iron gate, tapping, check, knife, plug and ball valves, dry-barrel and wet-barrel fire hydrants and metering, leak detection, pipe condition assessment and other products and services for the water infrastructure industry. Anvil manufactures and sources a broad range of products including a variety of fittings, couplings, hangers and related products.
	Segment results are not reflective of their results on a stand-alone basis. Intersegment sales and transfers are made at selling prices generally intended to cover costs. The determination of segment results excludes certain corporate expenses designated as Corporate because they are not directly attributable to segment operations. Consolidated interest, loss on early extinguishment of debt and income taxes are not allocated to the segments. Corporate expenses include those costs incurred by our corporate function, such as accounting, treasury, risk management, human resources, legal, tax and other administrative functions and also costs associated with assets and liabilities retained following the sale of U.S. Pipe. Corporate assets principally consist of cash, income tax assets, assets related to the sale of our former U.S. Pipe segment and deferred financing fees. Segment assets consist primarily of receivables, inventories, property, plant and equipment and intangible assets.
	Geographical area information is presented below.
		United States		Canada		Other			Total
		(in millions)
	Net sales:
	2014	$	1,040.70	$	101	$	43		$	1,184.70
	2013	971		101.5		48.3			1,120.80
	2012	872.3		112.4		39.2			1,023.90
	Property, plant and equipment, net:
	September 30, 2014	$	138.5	$	4.3	$	3.5		$	146.3
	September 30, 2013	133.6		4.7		3.6			141.9
	Approximately 39% of our 2014 gross sales were to our 10 largest customers, and approximately 24% of our 2014 gross sales were to our two largest customers, Ferguson Enterprises, Inc. (“Ferguson Enterprises”) and HD Supply, Inc. (“HD Supply”). Sales to Ferguson Enterprises comprised approximately 13%, 12% and 12% of our total gross sales during 2014, 2013 and 2012, respectively. In 2014, Ferguson Enterprises accounted for approximately 16% and 8% of gross sales for Mueller Co and Anvil, respectively. Receivables from Ferguson Enterprises totaled $25.7 million and $22.9 million at September 30, 2014 and 2013, respectively. Sales to HD Supply comprised approximately 11%, 11% and 10% of our total gross sales during 2014, 2013, and 2012, respectively. In 2014, HD Supply accounted for approximately 15% and 4% of gross sales for Mueller Co. and Anvil, respectively. Receivables from HD Supply totaled $17.7 million and $24.4 million at September 30, 2014 and 2013, respectively.
	Summarized financial information for our segments is presented below.
		Mueller Co.		Anvil		Corporate			Total
		(in millions)
	Net sales, excluding intercompany:
	2014	$	783.3	$	401.4	$	—		$	1,184.70
	2013	729.5		391.3		—			1,120.80
	2012	652.4		371.5		—			1,023.90
	Intercompany sales:
	2014	$	6.7	$	0.1	$	—		$	6.8
	2013	7.4		0.1		—			7.5
	2012	7.3		0.1		—			7.4
	Operating income (loss):
	2014	$	122.3	$	41.3	$	(39.5	)	$	124.1
	2013	91.3		40.2		(34.2		)	97.3
	2012	57.7		37.3		(30.9		)	64.1
	Depreciation and amortization:
	2014	$	42.1	$	14.2	$	0.4		$	56.7
	2013	44.6		14.2		0.4			59.2
	2012	45.7		14.3		0.6			60.6
	Restructuring:
	2014	$	2.2	$	0.9	$	—		$	3.1
	2013	1.5		0.1		(0.1		)	1.5
	2012	2.5		0.3		—			2.8
	Capital expenditures:
	2014	$	24.9	$	11.6	$	0.4		$	36.9
	2013	24		12.3		0.2			36.5
	2012	20		11.4		—			31.4
	Total assets:
	September 30, 2014	$	835.8	$	263.9	$	217.4		$	1,317.10
	September 30, 2013	846.8		259.6		175.5			1,281.90
	Intangible assets, net:
	September 30, 2014	$	475.7	$	57.9	$	—		$	533.6
	September 30, 2013	491.6		61.5		—			553.1

Commitments_and_Contingencies

Commitments and Contingencies	12 Months Ended
	Sep. 30, 2014
Commitments and Contingencies Disclosure [Abstract]	'
Commitments And Contingencies	'
	Commitments and Contingencies
	We are involved in various legal proceedings that have arisen in the normal course of operations, including the proceedings summarized below. The effect of the outcome of these matters on our financial statements cannot be predicted with certainty as any such effect depends on the amount and timing of the resolution of such matters. Other than the litigation described below, we do not believe that any of our outstanding litigation would have a material adverse effect on our business or prospects.
	Environmental. We are subject to a wide variety of laws and regulations concerning the protection of the environment, both with respect to the operations at many of our properties and with respect to remediating environmental conditions that may exist at our own or other properties. We strive to comply with federal, state and local environmental laws and regulations. We accrue for environmental expenses resulting from existing conditions that relate to past operations when the costs are probable and reasonably estimable.
	In the acquisition agreement pursuant to which a predecessor to Tyco sold our Mueller Co. and Anvil businesses to the prior owners of these businesses in August 1999, Tyco agreed to indemnify us and our affiliates, among other things, for all “Excluded Liabilities.” Excluded Liabilities include, among other things, substantially all liabilities relating to the time prior to August 1999, including environmental liabilities. The indemnity survives indefinitely. Tyco's indemnity does not cover liabilities to the extent caused by us or the operation of our businesses after August 1999, nor does it cover liabilities arising with respect to businesses or sites acquired after August 1999. Since 2007, Tyco has engaged in multiple corporate restructurings, split-offs and divestitures. While none of these transactions directly affects the indemnification obligations of the Tyco indemnitors under the 1999 acquisition agreement, the result of such transactions is that the assets of, and control over, such Tyco indemnitors has changed. Should any of these Tyco indemnitors become financially unable or fail to comply with the terms of the indemnity, we may be responsible for such obligations or liabilities.
	In September 1987, we implemented an Administrative Consent Order (“ACO”) for our Burlington, New Jersey property, which was required under the New Jersey Environmental Cleanup Responsibility Act (now known as the Industrial Site Recovery Act). The ACO required soil and ground-water cleanup, and we completed, and received final approval on, the soil cleanup required by the ACO. We retained this property related to the sale of our former U.S. Pipe segment. We expect ground-water issues as well as issues associated with the demolition of former manufacturing facilities at this site will continue and remediation by us could be required. Long-term ground-water monitoring may also be required, but we do not know how long such monitoring would be required and do not believe monitoring or further remediation costs, if any, will have a material adverse effect on any of our financial statements.
	On July 13, 2010, Rohcan Investments Limited, the former owner of property leased by Mueller Canada Ltd. and located in Milton, Ontario, filed suit against Mueller Canada Ltd. and its directors seeking C$10.0 million in damages arising from the defendants' alleged environmental contamination of the property and breach of lease. Mueller Canada Ltd. leased the property from 1988 through 2008. We are pursuing indemnification from a former owner for certain potential liabilities that are alleged in this lawsuit, and we have accrued for other liabilities not covered by indemnification.  On December 7, 2011, the Court denied the plaintiff's motion for summary judgment.
	Walter Energy-related Income Taxes. Each member of a consolidated group for federal income tax purposes is severally liable for the federal income tax liability of each other member of the consolidated group for any year in which it is a member of the group at any time during such year. Each member of the Walter Energy consolidated group, which included us through December 14, 2006, is also jointly and severally liable for pension and benefit funding and termination liabilities of other group members, as well as certain benefit plan taxes. Accordingly, we could be liable under such provisions in the event any such liability is incurred, and not discharged, by any other member of the Walter Energy consolidated group for any period during which we were included in the Walter Energy consolidated group.
	A dispute exists with regard to federal income taxes for 1980 through 1994 allegedly owed by the Walter Energy consolidated group. According to Walter Energy's last available public filing on the matter, Walter Energy's management estimated that the amount of tax claimed by the IRS was approximately $34.0 million for issues currently in dispute in bankruptcy court for matters unrelated to us. This amount is subject to interest and penalties. Of the $34.0 million in claimed tax, $21.0 million represents issues in which the IRS is not challenging the deductibility of the particular expense but only whether such expense is deductible in a particular year. Walter Energy's management believes that Walter Energy's financial exposure should be limited to interest and possible penalties and the amount of any tax claimed will be offset by favorable adjustments in other years.
	In addition, the IRS previously issued a Notice of Proposed Deficiency assessing additional tax of $82.2 million for the fiscal years ended May 31, 2000 through December 31, 2005. Walter Energy filed a formal protest with the IRS, but had not reached a final resolution with the Appeals Division at September 30, 2014. The unresolved issues relate primarily to Walter Energy's method of recognizing revenue on the sale of homes and related interest on the installment notes receivable. The items at issue relate primarily to the timing of revenue recognition and consequently, should the IRS prevail on its positions, Walter Energy's financial exposure should be limited to interest and penalties. As a matter of law, we are jointly and severally liable for any final tax determination for any year in which any of our subsidiaries were members of the Walter Energy consolidated group, which means that we would be liable in the event Walter Energy is unable to pay any amounts owed. Walter Energy has disclosed that it believes its filing positions have substantial merit and that it intends to defend vigorously any claims asserted.
	Walter Energy effectively controlled all of our tax decisions for periods during which we were a member of the Walter Energy consolidated group for federal income tax purposes and certain combined, consolidated or unitary state and local income tax groups. Under the terms of the income tax allocation agreement between us and Walter Energy dated May 26, 2006, we generally compute our tax liability on a stand-alone basis, but Walter Energy has sole authority to respond to and conduct all tax proceedings (including tax audits) relating to our federal income and combined state returns, to file all such returns on our behalf and to determine the amount of our liability to (or entitlement to payment from) Walter Energy for such previous periods. This arrangement may result in conflicts between Walter Energy and us.
	Our separation from Walter Energy on December 14, 2006 was intended to qualify as a tax-free spin-off under Section 355 of the Internal Revenue Code. In addition, the tax allocation agreement provides that if the spin-off is determined not to be tax-free pursuant to Section 355, we generally will be responsible for any taxes incurred by Walter Energy or its shareholders if such taxes result from certain of our actions or omissions and for a percentage of any such taxes that are not a result of our actions or omissions or Walter Energy's actions or omissions or taxes based upon our market value relative to Walter Energy's market value. Additionally, to the extent that Walter Energy was unable to pay taxes, if any, attributable to the spin-off and for which it is responsible under the tax allocation agreement, we could be liable for those taxes as a result of being a member of the Walter Energy consolidated group for the year in which the spin-off occurred.
	In accordance with the income tax allocation agreement, Walter Energy used certain tax assets of one of our predecessors in its calendar 2006 tax return for which payment to us is required. The income tax allocation agreement only requires Walter Energy to make the payment upon realization of the tax benefit by receiving a refund or otherwise offsetting taxes due. Walter Energy currently owes us $11.6 million, which includes recent tax audit and amended tax return adjustments, that is payable pending completion of an IRS audit of Walter Energy's 2006 tax year and the related refund of tax from that year. This receivable is included in other current assets at September 30, 2014.
	Indemnifications. We are a party to contracts in which it is common for us to agree to indemnify third parties for certain liabilities that arise out of or relate to the subject matter of the contract. In some cases, this indemnity extends to related liabilities arising from the negligence of the indemnified parties, but usually excludes any liabilities caused by gross negligence or willful misconduct. We cannot estimate the potential amount of future payments under these indemnities until events arise that would trigger a liability under the indemnities.
	Additionally, in connection with the sale of assets and the divestiture of businesses, such as the divestiture of our U.S. Pipe segment, we may agree to indemnify buyers and related parties for certain losses or liabilities incurred by these parties with respect to: (i) the representations and warranties made by us to these parties in connection with the sale and (ii) liabilities related to the pre-closing operations of the assets or business sold. Indemnities related to pre-closing operations generally include certain environmental and tax liabilities and other liabilities not assumed by these parties in the transaction.
	Indemnities related to the pre-closing operations of sold assets or businesses normally do not represent additional liabilities to us, but simply serve to protect these parties from potential liability associated with our obligations existing at the time of the sale. As with any liability, we have accrued for those pre-closing obligations that are considered probable and reasonably estimable. Should circumstances change, increasing the likelihood of payments related to a specific indemnity, we will accrue a liability when future payment is probable and the amount is reasonably estimable.
	Other Matters. Anvil is in a dispute with Victaulic Company (“Victaulic”) regarding two patents held by Victaulic, U.S. Patent 7,086,131 (the “131 Patent”) and U.S. Patent 7,712,796 (the “796 Patent” and collectively with the 131 Patent, the “U.S. Patents”), which Anvil believes are invalid. The U.S. Patents potentially relate to a coupling product currently manufactured and marketed by Anvil. Anvil filed multiple reexamination requests with the U.S. Patent and Trademark Office (the “PTO”) regarding the U.S. Patents, and the PTO granted the requests. Although the PTO examiner initially invalidated most of the claims of the 796 Patent, the PTO examiner affirmed the validity of the 796 Patent in September 2014. In October 2014, the PTO examiner rejected the original claim of the 131 Patent, but indicated the allowance of newly added claims that appear substantially similar to those included in the 796 Patent. The final PTO decisions with respect to the U.S. Patents will likely be appealed by Anvil and/or Victaulic. Relatedly, Anvil and Victaulic are engaged in lawsuits in the U.S. District Court for the Northern District of Georgia and in the Federal Court of Toronto, Ontario, Canada. The Georgia District Court litigation has been stayed pending the final outcome of the ongoing reexaminations of the U.S. Patents by the PTO. Although Anvil intends to continue to vigorously contest the validity of the U.S. Patents, as well as Victaulic’s related patents in Canada, and to defend itself against any counterclaims made by Victaulic, the probability of a favorable or unfavorable outcome with respect to these proceedings is unknown. Any number of potential outcomes is possible due to the multiple claims associated with the proceedings, each of which is in different stages and subject to appeal. Further, there are a number of highly complex factual and technical issues involved, and it is uncertain whether a favorable or unfavorable result with respect to a particular ruling or proceeding will impact the other matters in controversy. Accordingly, we have not recorded any accrual with respect to these proceedings and a range of liability is not reasonably estimable.
	We are party to a number of other lawsuits arising in the ordinary course of business, including product liability cases for products manufactured by us or third parties. We provide for costs relating to these matters when a loss is probable and the amount is reasonably estimable. Administrative costs related to these matters are expensed as incurred. The effect of the outcome of these matters on our future financial statements cannot be predicted with certainty as any such effect depends on the amount and timing of the resolution of such matters. While the results of litigation cannot be predicted with certainty, we believe that the final outcome of such other litigation is not likely to have a materially adverse effect on our business or prospects.
	Operating Leases. We maintain operating leases primarily for equipment and facilities. Rent expense was $9.3 million, $8.4 million and $8.4 million for 2014, 2013 and 2012, respectively. Future minimum payments under non-cancellable operating leases are $7.1 million, $5.8 million, $4.5 million, $2.8 million and $2.0 million during 2015, 2016, 2017, 2018 and 2019, respectively. Total minimum payments due beyond 2019 are $2.5 million.

Subsequent_Events

Subsequent Events	12 Months Ended
	Sep. 30, 2014
Subsequent Events [Abstract]	'
Subsequent Events	'
	Subsequent Events
	On November 25, 2014, we refinanced our long-term debt through a series of transactions. We retired our Senior Subordinated Notes and Senior Unsecured Notes and entered into a new Term Loan, as described in more detail in Note 7.
	On October 22, 2014, our board of directors declared a dividend of $0.0175 per share on our common stock, payable on or about November 20, 2014 to stockholders of record at the close of business on November 10, 2014.

Quarterly_Consolidated_Financi

Quarterly Consolidated Financial Information (Unaudited)	12 Months Ended
	Sep. 30, 2014
Quarterly Financial Information Disclosure [Abstract]	'
Quarterly Financial Information [Text Block]	'
	Quarterly Consolidated Financial Information (Unaudited)
		Quarter
		Fourth			Third			Second			First
		(in millions, except per share amounts)
	2014:00:00
	Net sales	$	320.7		$	318.5		$	288.1		$	257.4
	Gross profit	$	101.3		$	97.3		$	82.2		$	67.1
	Operating income	$	43		$	41.8		$	25.3		$	14
	Net income	$	26.2		$	18.5		$	9.7		$	1.1
	Net income per basic share(1)	$	0.16		$	0.12		$	0.06		$	0.01
	Net income per diluted share(1)	$	0.16		$	0.11		$	0.06		$	0.01
	2013:00:00
	Net sales	$	293.2		$	299.4		$	283.1		$	245.1
	Gross profit	$	88.8		$	90		$	77.3		$	57.1
	Operating income	$	33.2		$	32.9		$	24.3		$	6.9
	Income (loss) from continuing operations	$	16.8		$	16		$	7.6		$	(5.0	)
	Income (loss) from discontinued operations	(3.3		)	(1.9		)	(1.4		)	12
	Net income	$	13.5		$	14.1		$	6.2		$	7
	Net income per basic share(1):
	Continuing operations	$	0.11		$	0.1		$	0.05		$	(0.03	)
	Discontinued operations	(0.02		)	(0.01		)	(0.01		)	0.07
	Net income	$	0.09		$	0.09		$	0.04		$	0.04
	Net income (loss) per diluted share(1):
	Continuing operations	$	0.1		$	0.1		$	0.05		$	(0.03	)
	Discontinued operations	(0.02		)	(0.01		)	(0.01		)	0.07
	Net income	$	0.08		$	0.09		$	0.04		$	0.04
	(1)	The sum of the quarterly amounts may not equal the full year amount due to rounding.

Consolidating_Guarantor_and_No

Consolidating Guarantor and Non-Guarantor Financial Information	12 Months Ended
	Sep. 30, 2014
Consolidating Guarantor And Non-Guarantor Financial Information [Abstract]	'
Consolidating Guarantor and Non-Guarantor Financial Information [Text Block]	'
	The following information is included as a result of the guarantee by certain of our 100% owned U.S. subsidiaries (“Guarantor Companies”) of the Senior Unsecured Notes and the Senior Subordinated Notes. None of our other subsidiaries or our industrial valve joint venture guarantee the Senior Unsecured Notes and the Senior Subordinated Notes. Each of the guarantees is joint and several and full and unconditional. Guarantor Companies are listed below.
	Name	State of
		incorporation
		or organization
	Anvil International, LLC	Delaware
	Echologics, LLC	Delaware
	Henry Pratt Company, LLC	Delaware
	Henry Pratt International, LLC	Delaware
	Hydro Gate, LLC	Delaware
	J.B. Smith Mfg. Co., LLC	Delaware
	James Jones Company, LLC	Delaware
	Milliken Valve, LLC	Delaware
	Mueller Co. LLC	Delaware
	Mueller Group, LLC	Delaware
	Mueller Group Co-Issuer, Inc.	Delaware
	Mueller International, L.L.C.	Delaware
	Mueller Property Holdings, LLC	Delaware
	Mueller Co. International Holdings, LLC	Delaware
	Mueller Service California, Inc.	Delaware
	Mueller Service Co., LLC	Delaware
	Mueller Systems, LLC	Delaware
	OSP, LLC	Delaware
	U.S. Pipe Valve & Hydrant, LLC	Delaware

Summary_of_Significant_Account1

Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Sep. 30, 2014
Accounting Policies [Abstract]	'
Inventory Supplies, Policy	'
	-Other current assets include maintenance supplies and tooling costs. Costs for perishable tools and maintenance items are expensed when put into service. Costs for more durable items are amortized over their estimated useful lives, ranging from 3 to 10 years.
Revenue Recognition	'
	Revenue Recognition-Revenue is recognized when delivery of products has occurred or services have been rendered and there is persuasive evidence of a sales arrangement, selling prices are fixed or determinable and collectibility is reasonably assured. Revenue is reported net of estimated discounts, returns and rebates as “net sales.”
Shipping and Handling	'
	Shipping and Handling-Costs to ship products to customers are included in cost of sales. Amounts billed to customers, if any, to cover shipping and handling costs are included in net sales.
Share-based Compensation	'
	Stock-based Compensation-Compensation expense for stock-based awards granted to employees and directors is based on the fair value at the grant dates for most of our outstanding stock-based compensation awards, and is based on the fair value at each reporting date for our Phantom Plan and cash-settled performance share awards. See Note 10 for more information regarding our stock-based compensation. Stock-based compensation expense is a component of selling, general and administrative expenses.
Cash and Cash Equivalents	'
	Cash and Cash Equivalents-All highly liquid investments with remaining maturities of 90 days or less when purchased are classified as cash equivalents. Where there is no right of offset against cash balances, outstanding checks are included in accounts payable.
Receivables	'
	Receivables-Receivables are amounts due from customers. To reduce credit risk, credit investigations are generally performed prior to accepting orders from new customers and, when necessary, letters of credit, bonds or other instruments are required to ensure payment.
	The estimated allowance for doubtful receivables is based upon judgments and estimates of expected losses and specific identification of problem accounts. Significantly weaker than anticipated industry or economic conditions could impact customers' ability to pay such that actual losses may be greater than the amounts provided for in this allowance. The periodic evaluation of the adequacy of the allowance for doubtful receivables is based on an analysis of prior collection experience, specific customer creditworthiness and current economic trends within the industries served. In circumstances where we expect a specific customer's inability to meet its financial obligations (e.g., bankruptcy filings or substantial downgrading of credit ratings), we record a specific allowance to reduce the receivable to the amount management reasonably believes will be collected.
Inventories	'
	Inventories-Inventories are recorded at the lower of first-in, first-out method cost or market value. We evaluate our inventory in terms of excess and obsolete exposures. This evaluation includes such factors as anticipated usage, inventory turnover, inventory levels and ultimate product sales value. Inventory cost includes an overhead component that is affected by levels of production and actual costs incurred. Management periodically evaluates the effects of production levels and costs capitalized as part of inventory.
Property, Plant and Equipment	'
	Property, Plant and Equipment-Property, plant and equipment is recorded at cost, less accumulated depreciation. Depreciation is recorded using the straight-line method over the estimated useful lives of the assets. Estimated useful lives are 10 to 20 years for land improvements, 10 to 40 years for buildings and 3 to 15 years for machinery and equipment. Leasehold improvements and capitalized leases are depreciated using the straight-line method over the lesser of the useful life of the asset or the remaining lease term. Gains and losses upon disposition are reflected in operating results in the period of disposition.
	Direct internal and external costs to implement computer systems and internal-use software are capitalized. Capitalized costs are depreciated over the estimated useful life of the system or software, generally 3 to 6 years, beginning when site installation or module development is complete and ready for use.
	Liabilities are recognized at fair value for asset retirement obligations related to plant and landfill closures in the period in which they are incurred and the carrying amounts of the related long-lived assets are correspondingly increased. Over time, the liabilities are accreted to their estimated future values. At September 30, 2014 and 2013, asset retirement obligations were $3.2 million and $3.6 million, respectively.
Accounting for the Impairment of Long-Lived Assets	'
	Accounting for the Impairment of Long-Lived Assets-We test intangible assets that have an indefinite life and goodwill for impairment annually (or more frequently if events or circumstances indicate possible impairment.) We perform our annual impairment testing at September 1. We amortize finite-lived intangible assets over their respective estimated useful lives and review for impairment if events or circumstances indicate possible impairment.
Workers Compensation	'
	Workers Compensation-Our exposure to workers compensation claims is generally limited to $1 million per incident. Liabilities, including those related to claims incurred but not reported, are recorded principally using annual valuations based on discounted future expected payments and using historical data combined with insurance industry data when historical data is limited. We are indemnified under an agreement with a predecessor to Tyco for all Mueller Co. and Anvil workers compensation liabilities related to incidents that occurred prior to August 16, 1999. See Note 16. We retained U.S. Pipe workers compensation liabilities related to incidents that occurred prior to April 1, 2012, but the Purchaser has agreed to reimburse us for up to $11.8 million in payments we make related to these liabilities. At September 30, 2014, the remaining reimbursements may be up to $6.5 million, which we have recorded on a discounted basis as $1.6 million in other current assets and $4.0 million in other noncurrent assets. See Note 5. On an undiscounted basis, workers compensation liabilities were $17.0 million and $20.0 million at September 30, 2014 and 2013, respectively. On a discounted basis, workers compensation liabilities were $14.7 million and $17.2 million at September 30, 2014 and 2013, respectively.
	We apply a discount rate at a risk-free interest rate, generally a U.S. Treasury bill rate, for each policy period. The rate used is one with a duration that corresponds to the weighted average expected payout period for each policy period. Once a discount rate is applied to a policy period, it remains the discount rate for that policy period until al
Warranty Costs	'
	Warranty Costs-We accrue for warranty expenses that can include customer costs of repair and/or replacement, including labor, materials, equipment, freight and reasonable overhead costs. We accrue for the estimated cost of product warranties at the time of sale if such costs are determined to be reasonably estimable at that time. Warranty cost estimates are revised throughout applicable warranty periods as better information regarding warranty costs becomes available.
Deferred Financing Fees	'
	Deferred Financing Fees-Costs of debt financing are charged to expense over the lives of the related financing agreements, which ranged from 5 to 10 years. Remaining costs and the future period over which they would be charged to expense are reassessed when amendments to the related financing agreements or prepayments occur.
	Deferred financing fees of $6.7 million at September 30, 2014 were scheduled to amortize as follows: $2.1 million related to the ABL Agreement amortizes on a straight-line basis; $2.8 million related to the Senior Unsecured Notes amortizes using the effective-interest rate method; and $1.8 million related to the Senior Subordinated Notes amortizes using the effective-interest rate method. All such amortization would have been over the remaining term of the respective debt.
Derivative Instruments and Hedging Activities	'
	Derivative Instruments and Hedging Activities-Changes in the fair value of derivative instruments accounted for as effective cash-flow hedges were recorded to accumulated other comprehensive loss. Gains and losses on derivative instruments not qualifying as effective cash-flow hedges, representing hedge ineffectiveness and hedge components excluded from the assessment of effectiveness, were recognized in earnings in the periods in which they occurred.
	Our ongoing business operations expose us to commodity price risk and interest rate risk, which we had previously managed to some extent using derivative instruments. We used natural gas swap contracts at U.S. Pipe to manage the price risk associated with purchases of natural gas used in certain of our manufacturing processes and interest rate swap contracts to manage interest rate risk associated with our variable-rate borrowings. During 2010, we terminated all of our remaining interest rate swap contracts and we reclassified expense related to these swap contracts from accumulated other comprehensive loss to interest expense in 2012. We have not initiated any new interest rate swap contracts since then. During 2012, we terminated our remaining natural gas swap contract and have not initiated any new natural gas swap contracts since then.
	We had designated our natural gas swap contracts and interest rate swap contracts as cash flow hedges of our purchases of natural gas and our interest payments, respectively. As a result, to the extent the hedges were effective, the changes in the fair value of these contracts prior to settlement were reported as a component of accumulated other comprehensive loss and reclassified into earnings in the periods during which the hedged transactions affected, or were expected to affect, earnings.
Income Taxes	'
	Income Taxes-Deferred tax liabilities and deferred tax assets are recognized for the expected future tax consequences of events that have been included in the financial statements or tax returns. Such liabilities and assets are determined based on the differences between the financial statement basis and the tax basis of assets and liabilities, using tax rates in effect for the years in which the differences are expected to reverse. A valuation allowance is provided when, based upon the available evidence, it is more likely than not that some or all of the deferred tax assets will not be realized.
	We only record tax benefits for positions that management believes are more likely than not of being sustained under audit based solely on the technical merits of the associated tax position. The amount of tax benefit recognized for any position that meets the more likely than not threshold is the largest amount of the tax benefit that we believe is greater than 50% likely of being realized.
Environmental Expenditures	'
	Environmental Expenditures-We capitalize environmental expenditures that increase the life or efficiency of noncurrent assets or that reduce or prevent environmental contamination. We accrue for environmental expenses resulting from existing conditions that relate to past operations when the costs are probable and reasonably estimable. We are indemnified under an agreement with a predecessor to Tyco for certain environmental liabilities that existed at August 16, 1999. See Note 16.
Research and Development	'
	Research and Development-Research and development costs are expensed as incurred.
Advertising	'
	Advertising-Advertising costs are expensed as incurred.
Translation of Foreign Currency	'
	Translation of Foreign Currency-Assets and liabilities of our businesses whose functional currency is other than the U.S. dollar are translated into U.S. dollars using currency exchange rates at the balance sheet date. Revenues and expenses are translated at average currency exchange rates during the period. Foreign currency translation gains and losses are reported as a component of accumulated other comprehensive loss. Gains and losses resulting from foreign currency transactions are included in operating results as incurred.

Summary_of_Significant_Account2

Summary of Significant Accounting Policies (Tables)	12 Months Ended
	Sep. 30, 2014
Accounting Policies [Abstract]	'
Schedule of Credit Losses for Financing Receivables, Current [Table Text Block]	'
	The following table summarizes information concerning our allowance for doubtful receivables.
		2014			2013			2012
		(in millions)
	Balance at beginning of year	$	5.3		$	5.7		$	4.8
	Provision charged to expense	—			0.4			0.6
	Balances written off, net of recoveries	(0.1		)	(0.8		)	(0.1		)
	Other	0.1			—			0.4
	Balance at end of year	$	5.3		$	5.3		$	5.7
Schedule of Reserves for Excess and Obsolete Inventory	'
	The following table summarizes information concerning our inventory valuation reserves.
		2014			2013			2012
		(in millions)
	Balance at beginning of year	$	10.6		$	12.5		$	12.7
	Provision charged to expense	2.8			2.4			1.8
	Inventory disposed	(4.3		)	(4.6		)	(2.2		)
	Other	(0.6		)	0.3			0.2
	Balance at end of year	$	8.5		$	10.6		$	12.5
Schedule of Product Warranty Liability	'
	Activity in accrued warranty, reported as part of other current liabilities, is presented below.
		2014			2013			2012
		(in millions)
	Balance at beginning of year	$	2.8		$	1.6		$	2
	Warranty expense	4.1			4.2			1.4
	Warranty payments	(4.3		)	(3.0		)	(1.8		)
	Balance at end of year	$	2.6		$	2.8		$	1.6

Identifiable_Intangible_Assets1

Identifiable Intangible Assets (Tables)	12 Months Ended
	Sep. 30, 2014
Goodwill and Intangible Assets Disclosure [Abstract]	'
Schedule of Intangible Assets and Goodwill [Table Text Block]	'
	ntangible assets are presented below.
		September 30,
		2014			2013
		(in millions)
	Capitalized external-use software:
	Cost	$	14.3		$	12.2
	Accumulated amortization	(5.4		)	(4.3		)
	Net book value	8.9			7.9
	Business combination-related:
	Cost:
	Finite-lived intangible assets:
	Technology	80.4			80.1
	Customer relationships and other	400.2			398.1
	Indefinite-lived intangible assets:
	Trade names and trademarks	300			300
		780.6			778.2
	Accumulated amortization:
	Technology	(68.1		)	(61.5		)
	Customer relationships and other	(193.2		)	(171.5		)
		(261.3		)	(233.0		)
	Net book value	519.3			545.2
	Goodwill	5.4			—
	Total intangible assets net book value	$	533.6		$	553.1

Discontinued_Operations_Assets1

Discontinued Operations, Assets Held for Sale and Divestitures (Tables)	12 Months Ended
	Sep. 30, 2014
Discontinued Operations and Disposal Groups [Abstract]	'
Schedule of Disposal Groups, Including Discontinued Operations, Income Statement, Balance Sheet and Additional Disclosures [Table Text Block]	'
	The table below represents a summary of the operating results for the U.S. Pipe discontinued operations. These operating results do not reflect what they would have been had U.S. Pipe not been classified as discontinued operations.
		2013			2012
		(in millions)
	Net sales	$	—		$	197
	Cost of sales	—			197.9
	Gross loss	—			(0.9		)
	Operating expenses (income)	(0.5		)	4.2
	Operating income (loss)	0.5			(5.1		)
	Interest expense	—			0.3
	(Income) loss on sale of discontinued operations	(4.9		)	119.7
	Income tax benefit	—			(21.9		)
	Income (loss) from discontinued operations, net of tax	$	5.4		$	(103.2	)
	The allocations of current income tax expense (benefit) between continuing and discontinued operations are provided below.
		2014			2013						2012
		Continuing operations			Continuing operations			Discontinued operations			Continuing operations		Discontinued operations
		(in millions)
	Expense from operations	$	30.1		$	17.5		$	2.1		$	1.4	$	(48.7	)
	Valuation allowance-related benefit	(9.6		)	(8.5		)	(2.1		)	6.5		26.7
	Other items	(2.5		)	(0.2		)	—			—		0.1
	Income tax expense	$	18		$	8.8		$	—		$	7.9	$	(21.9	)

Income_Taxes_Tables

Income Taxes (Tables)	12 Months Ended
	Sep. 30, 2014
Income Tax Disclosure [Abstract]	'
Schedule of Income before Income Tax, Domestic and Foreign	'
	The components of income (loss) before income taxes are presented below.
		2014			2013			2012
		(in millions)
	U.S.	$	71.6		$	41		$	(0.1	)
	Non-U.S.	1.9			3.2			2.8
	Income before income taxes	$	73.5		$	44.2		$	2.7
Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]	'
	Income tax expense (benefit) from continuing operations is presented below.
		2014			2013			2012
		(in millions)
	Current:
	U.S. federal	$	0.1		$	0.6		$	0.2
	U.S. state and local	1.6			0.1			(1.0		)
	Non-U.S.	0.7			0.8			1.1
		2.4			1.5			0.3
	Deferred:
	U.S. federal	28.7			6.2			(0.6		)
	U.S. state and local	(12.8		)	1.3			9
	Non-U.S.	(0.3		)	(0.2		)	(0.8		)
		15.6			7.3			7.6
	Income tax expense	$	18		$	8.8		$	7.9
Schedule of Disposal Groups, Including Discontinued Operations, Income Statement, Balance Sheet and Additional Disclosures [Table Text Block]	'
	The table below represents a summary of the operating results for the U.S. Pipe discontinued operations. These operating results do not reflect what they would have been had U.S. Pipe not been classified as discontinued operations.
		2013			2012
		(in millions)
	Net sales	$	—		$	197
	Cost of sales	—			197.9
	Gross loss	—			(0.9		)
	Operating expenses (income)	(0.5		)	4.2
	Operating income (loss)	0.5			(5.1		)
	Interest expense	—			0.3
	(Income) loss on sale of discontinued operations	(4.9		)	119.7
	Income tax benefit	—			(21.9		)
	Income (loss) from discontinued operations, net of tax	$	5.4		$	(103.2	)
	The allocations of current income tax expense (benefit) between continuing and discontinued operations are provided below.
		2014			2013						2012
		Continuing operations			Continuing operations			Discontinued operations			Continuing operations		Discontinued operations
		(in millions)
	Expense from operations	$	30.1		$	17.5		$	2.1		$	1.4	$	(48.7	)
	Valuation allowance-related benefit	(9.6		)	(8.5		)	(2.1		)	6.5		26.7
	Other items	(2.5		)	(0.2		)	—			—		0.1
	Income tax expense	$	18		$	8.8		$	—		$	7.9	$	(21.9	)
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]	'
	The reconciliation between income tax expense at the U.S. federal statutory income tax rate and reported income tax expense from continuing operations is presented below.
		2014			2013			2012
		(in millions)
	Expense at U.S. federal statutory income tax rate of 35%	$	25.7		$	15.5		$	0.9
	Adjustments to reconcile to income tax expense:
	Federal valuation allowance	(1.2		)	(7.8		)	—
	State income taxes, net of federal benefit	3.6			2			(0.8		)
	State tax rate change	(2.5		)	—			—
	State valuation allowance, net of federal benefit	(8.4		)	(1.1		)	5.9
	Tax credits	(0.1		)	(0.6		)	(0.1		)
	Nondeductible expenses, other than compensation	0.9			0.5			0.7
	Foreign income taxes	(0.2		)	0.4			(0.3		)
	Nondeductible compensation	0.8			0.2			1.4
	Other	(0.6		)	(0.3		)	0.2
	Income tax expense	$	18		$	8.8		$	7.9
Schedule of Deferred Tax Assets and Liabilities	'
	Deferred income tax balances are presented below.
		September 30,
		2014			2013
		(in millions)
	Deferred income tax assets:
	Inventory reserves	$	15.2		$	17.2
	Accrued expenses	15.3			17.2
	Pension and other postretirement benefits	20.3			2.4
	Stock-based compensation	10.7			9.1
	State net operating losses	10.3			13.4
	Federal net operating losses and credit carryovers	6.8			37.4
	Other	1.9			1.6
		80.5			98.3
	Valuation allowance	(0.7		)	(10.3		)
	Total deferred income tax assets, net of valuation allowance	79.8			88
	Deferred income tax liabilities:
	Intangible assets	190.1			199.8
	Other	1.5			3
	Total deferred income tax liabilities	191.6			202.8
	Net deferred income tax liabilities	$	111.8		$	114.8
Summary of Valuation Allowance	'
	The allocations of the valuation allowance charge among continuing operations, discontinued operations, and accumulated other comprehensive loss are presented below.
		2014			2013
		(in millions)
	Balance at beginning of year	$	10.3		$	49.2
	Decrease allocated to continuing operations	(9.6		)	(8.5		)
	Decrease allocated to discontinued operations	—			(2.1		)
	Decrease allocated to accumulated other comprehensive loss	—			(27.8		)
	Expired items	—			(0.5		)
	Balance at end of year	$	0.7		$	10.3
Summary of Unrecognized Tax Benefits	'
	The following table summarizes information concerning our gross unrecognized tax benefits.
		2014			2013
		(in millions)
	Balance at beginning of year	$	3.7		$	4.3
	Increases related to prior year positions	—			0.5
	Decreases due to lapse in statute of limitations	(1.0		)	(1.1		)
	Balance at end of year	$	2.7		$	3.7

Borrowing_Arrangements_Tables

Borrowing Arrangements (Tables)	12 Months Ended
	Sep. 30, 2014
Long-term Debt and Capital Lease Obligations [Abstract]	'
Components of Long-Term Debt	'
	The components of our long-term debt are presented below.
		September 30,
		2014			2013
		(in millions)
	ABL Agreement	$	—		$	—
	Senior Subordinated Notes	365			420
	Senior Unsecured Notes	178.3			178
	Other	2.3			2.8
		545.6			600.8
	Less current portion	(46.2		)	(1.3		)
	Long-term debt	$	499.4		$	599.5

Retirement_Plans_Tables

Retirement Plans (Tables)	12 Months Ended
	Sep. 30, 2014
Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract]	'
Schedule of Net Periodic Benefit Cost	'
	The components of net periodic benefit cost are presented below.
		2014				2013				2012
		(in millions)
	Service cost	$	1.7			$	2			$	1.8
	Interest cost	19.9				18.3				20.2
	Expected return on plan assets	(23.8		)		(25.1		)		(24.0		)
	Amortization of prior service cost	—				—				0.6
	Amortization of net loss	3.5				9				6
	Curtailment / special settlement loss	0.1				0.1				0.2
	Costs allocated to discontinued operations	—				—				(1.1		)
	Other	0.1				—				—
	Net periodic benefit cost	$	1.5			$	4.3			$	3.7
Schedule of Accumulated and Projected Benefit Obligations	'
	information for Pension Plans with accumulated benefit obligations in excess of plan assets is presented below.
		September 30,
		2014				2013
		(in millions)
	Projected benefit obligations	$	459.9			$	390.4
	Accumulated benefit obligations	459.9				390.4
	Fair value of plan assets	407.6				384.8
	Balance sheet information for Pension Plans with accumulated benefit obligations less than plan assets is presented below.
		September 30,
		2014				2013
		(in millions)
	Projected benefit obligations	$	1.6			$	9.2
	Accumulated benefit obligations	1.6				9.1
	Fair value of plan assets	2.9				10.4
Schedule Of Defined Benefit Plans Disclosures	'
	Amounts recognized for our Pension Plans and other postretirement benefit plans are presented below.
		Pension Plans								Other Plans
		2014				2013				2013
		(in millions)
	Projected benefit obligations:
	Beginning of year	$	399.6			$	448.3			$	0.2
	Service cost	1.7				2				—
	Interest cost	19.9				18.3				—
	Actuarial loss (gain)	67.3				(42.5		)		—
	Benefits paid	(26.0		)		(26.0		)		(0.2		)
	Currency translation	(0.8		)		(0.5		)		—
	Decrease in obligation due to curtailment	(0.2		)		—				—
	End of year	$	461.5			$	399.6			$	—
	Accumulated benefit obligations at end of year	$	461.5			$	399.5			$	—
	Plan assets:
	Beginning of year	$	395.2			$	387.1			$	—
	Actual return on plan assets	42.1				34.4				—
	Employer contributions	0.1				0.2				0.2
	Currency translation	(0.9		)		(0.5		)		—
	Benefits paid	(26.0		)		(26.0		)		(0.2		)
	End of year	$	410.5			$	395.2			$	—
	Accrued benefit cost at end of year:
	Unfunded status	$	(51.0	)		$	(4.4	)		$	—
	Recognized on balance sheet:
	Other noncurrent assets	$	1.3			$	1.3			$	—
	Other noncurrent liabilities	(52.3		)		(5.7		)		—
		$	(51.0	)		$	(4.4	)		$	—
	Recognized in accumulated other comprehensive loss, before tax:
	Prior year service cost	$	0.1			$	0.2			$	—
	Net actuarial loss	119.7				74.5				—
		$	119.8			$	74.7			$	—
Schedule of Pension and Other Postretirement Benefits Activity in Accumulated Other Comprehensive Income (Loss)	'
	Pension Plan activity in accumulated other comprehensive loss, before tax, in 2014 is presented below, in millions.
	Balance at beginning of year	$	74.7
	Actuarial gain	48.9
	Prior year service loss amortization to net periodic cost	(3.5		)
	Other	(0.3		)
	Balance at end of year	$	119.8
Schedule of Components of Accumulated Other Comprehensive Income (Loss) Related to Pension and Other Postretirement Benefits Expected to be Amortized	'
	The components of accumulated other comprehensive loss related to pension that we expect to amortize into net periodic benefit cost in 2015 are presented below, in millions.
	Amortization of unrecognized prior year service cost	$	—
	Amortization of unrecognized loss	3.2
		$	3.2
Schedule of Assumptions Used	'
	A summary of key assumptions for our pension and other postretirement benefit plans is below.
		Pension Plans									Other Plans
		2014			2013			2012			2013		2012
	Weighted average used to determine benefit obligations:
	Discount rate	4.49	%		5.16	%		4.21	%		n/a		4.22	%
	Rate of compensation increases	3.5			3.5			3.5			n/a		n/a
	Weighted average used to determine net periodic cost:
	Discount rate	5.16	%		4.21	%		5.66	%		n/a		5.69	%
	Expected return on plan assets	6.24			6.71			6.95			n/a		n/a
	Rate of compensation increases	3.5			3.5			3.5			n/a		n/a
Schedule of Effect of One-Percentage-Point Change in Assumptions	'
	Assumed discount rates, expected return on plan assets and salary increases affect the amounts reported for the Pension Plans. The effects of a one-percentage-point change in the trend rate for these assumptions are below.
		1 Percentage				1 Percentage
		point increase				point decrease
		(in millions)
	Discount rate:
	Effect on pension service and interest costs	$	(0.1	)		$	0.7
	Effect on pension benefit obligations	(50.3		)		61.8
	Effect on 2015 service and interest costs	(0.5		)		0.5
	Expected return on plan assets:
	Effect on 2015 service and interest costs	(4.0		)		4
Schedule of Strategic Allocation of Plan Assets [Table Text Block]	'
	We maintain a single trust to hold the assets of the U.S. pension plan. During 2013, the strategic asset allocation was adjusted to 40% equity investments from 60% equity investments. This trust's strategic asset allocations, tactical range at September 30, 2014 and actual asset allocations are presented below.
		Strategic asset allocation							Actual asset allocations at
									September 30,
					Tactical range				2014			2013			2012
	Equity investments:
	Large capitalization stocks	26	%
	Small capitalization stocks	5
	International stocks	9
		40			30	-	50%		40	%		40	%		59	%
	Fixed income investments	60			50	-	70		59			59			39
	Cash	—			0	-	5		1			1			2
		100	%						100	%		100	%		100	%
Schedule of Allocation of Plan Assets	'
	The assets of the Pension Plans by level within the fair value hierarchy are presented below.
		September 30, 2014
		Level 1				Level 2				Total
		(in millions)
	Equity:
	Large cap stocks:
	Large cap growth funds	$	—			$	31.5			$	31.5
	Large cap index funds	—				35.9				35.9
	Large cap value funds	—				15.3				15.3
	Small cap stocks:
	Small cap growth funds	—				18.5				18.5
	International stocks:
	Mutual funds	45.9				—				45.9
	International funds	—				15.4				15.4
	Total equity	45.9				116.6				162.5
	Fixed income	—				243.5				243.5
	Cash and cash equivalents	4.5				—				4.5
		$	50.4			$	360.1			$	410.5
		September 30, 2013
		Level 1				Level 2				Total
		(in millions)
	Equity:
	Large cap stocks:
	Large cap growth funds	$	—			$	31.7			$	31.7
	Large cap index funds	—				26.1				26.1
	Large cap value funds	—				16.3				16.3
	Large cap growth mutual funds	16.1				—				16.1
	Small cap stocks:
	Small cap growth funds	—				23.5				23.5
	International stocks:
	Mutual funds	31.5				—				31.5
	International funds	—				15.7				15.7
	Total equity	47.6				113.3				160.9
	Fixed income	—				229.8				229.8
	Cash and cash equivalents	4.5				—				4.5
		$	52.1			$	343.1			$	395.2
Schedule of Expected Benefit Payments	'
	Our estimated future pension benefit payments are presented below in millions.
	2015	$	27.6
	2016	26.8
	2017	27
	2018	27.3
	2019	27.5
	2020-2024	141

Capital_Stock_Tables

Capital Stock (Tables)	12 Months Ended
	Sep. 30, 2014
Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract]	'
Schedule of Common Stock Outstanding Roll Forward [Table Text Block]	'
	Common stock share activity is presented below.
	Shares outstanding at September 30, 2011	155,793,612
	Exercise of stock options	8,552
	Exercise of employee stock purchase plan instruments	339,242
	Vesting of restricted stock units, net of shares withheld for taxes	699,242
	Shares outstanding at September 30, 2012	156,840,648
	Exercise of stock options	384,475
	Exercise of employee stock purchase plan instruments	290,173
	Vesting of restricted stock units, net of shares withheld for taxes	719,004
	Shares outstanding at September 30, 2013	158,234,300
	Exercise of employee stock purchase plan instruments	204,360
	Exercise of stock options	587,964
	Vesting of restricted stock units, net of shares withheld for taxes	734,047
	Shares outstanding at September 30, 2014	159,760,671

Stockbased_Compensation_Plans_

Stock-based Compensation Plans (Tables)	12 Months Ended
	Sep. 30, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]	'
Schedule of Share-based Compensation, Effect on Statement of Operations	'
		2014				2013				2012
		(in millions, except per share data)
	Decrease in operating income	$	13.2			$	11.4			$	6
	Decrease in net income or increase in net loss	8.1				6.9				3.5
	Effect on earnings or loss per basic share	0.05				0.04				0.02
	Effect on earnings or loss per diluted share	0.05				0.04				0.02
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity	'
	Restricted Stock Units. Depending on the specific terms of each award, restricted stock units generally vest on the three-year anniversary of the grant date, or ratably over the life of the award, usually three years, on each anniversary date of the original grant. Restricted stock units granted since November 2007 also vest upon the Retirement (as defined in the 2006 Plan) of a participant. Compensation expense for restricted stock units is recognized between the grant date and the vesting date (or the date on which a participant becomes Retirement-eligible, if sooner) on a straight-line basis for each tranche of each award. Fair values of restricted stock units are determined using the closing price of our common stock on the respective dates of grant.
	Restricted stock unit activity under the 2006 Plan is summarized below.
		Restricted stock units			Weighted				Weighted		Aggregate
					average				average		intrinsic
					grant date fair value per unit				remaining		value
									contractual		(millions)
									term (years)
	Outstanding at September 30, 2011	2,065,766			$	6.11			1.6
	Granted	1,406,318			2.19
	Vested	(867,451	)		5.44						$	2.2
	Cancelled	(180,871	)		5.33
	Outstanding at September 30, 2012	2,423,762			4.13				1
	Granted	509,338			5.37
	Vested	(995,037	)		4.77						5.6
	Cancelled	(12,723	)		12.28
	Outstanding at September 30, 2013	1,925,340			4.3				0.9
	Granted	381,012			8.51
	Vested	(1,099,591	)		4.94						9.4
	Cancelled	—			—
	Outstanding at September 30, 2014	1,206,761			$	5.04			0.7
Schedule of Share-based Compensation. Options	'
	Stock Options. Outstanding stock options generally vest on each anniversary date of the original grant ratably over three years. Stock options granted since November 2007 also vest upon the Retirement of a participant. Compensation expense for stock options is recognized between the grant date and the vesting date (or the date on which a participant becomes Retirement-eligible, if sooner) on a straight-line basis for each tranche of each award. Stock option activity under the 2006 Plan is summarized below.
		Options			Weighted				Weighted		Aggregate
					average				average		intrinsic
					exercise				remaining		value
					price				contractual		(millions)
					per option				term (years)
	Outstanding at September 30, 2011	5,625,133			$	6.74			7.5		$	—
	Granted	677,117			2.18
	Exercised	(8,552	)		3.59						—
	Cancelled	(771,088	)		5.97
	Outstanding at September 30, 2012	5,522,610			6.3				6.8		3.5
	Granted	125,780			5.91
	Exercised	(384,475	)		4.97						1.2
	Cancelled	(139,209	)		12.52
	Outstanding at September 30, 2013	5,124,706			6.22				5.9		14.6
	Granted	86,904			8.58
	Exercised	(587,964	)		4.61						—
	Cancelled	(71,411	)		12.92
	Outstanding at September 30, 2014	4,552,235			$	6.37			5		$	13.6
	Exercisable at September 30, 2014	4,151,589			$	6.56			4.8		$	12
	Expected to vest after September 30, 2014	400,136			$	4.32			7.9		$	1.6
Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table Text Block]	'
	Stock option exercise prices are equal to the closing price of our common stock on the relevant grant date. The ranges of exercise prices for stock options outstanding at September 30, 2014 are summarized below.
	Exercise price										Options		Weighted		Weighted	Exercisable options	Weighted
													average		average		average
													exercise price		remaining		exercise price
															contractual
															term (years)
		$	0		-	$	4.99				1,803,311		$	3.23	6.4	1,565,034	$	3.37
		$	5		-	$	9.99				1,801,805		5.85		5	1,639,436	5.7
		$	10		-	$	14.99				656,276		11.84		2.7	656,276	11.84
		$	15		-	$	20.99				290,843		16.71		1.8	290,843	16.71
											4,552,235		$	6.37	5	4,151,589	$	6.56
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions	'
	Compensation expense attributed to stock options is based on the fair value of the awards on their respective grant dates, as determined using a Black-Scholes model. The weighted average grant-date fair values of stock options granted and the weighted average assumptions used to determine these fair values are indicated below.
		2014				2013				2012
	Grant-date fair value	$	5.13			$	5.91			$	1.31
	Risk-free interest rate	2.44		%		1.63		%		1.74		%
	Dividend yield	1.1		%		2.17		%		1.97		%
	Expected life (years)	8				8				8
	Expected annual volatility	0.6386				0.6696				0.7342
	The risk-free interest rate is based on the U.S. Treasury zero-coupon yield in effect at the grant date with a term equal to the expected life. The expected dividend yield is based on our estimated annual dividend and stock price history at the grant date. The expected term represents the period of time the awards are expected to be outstanding.
Schedule of Share-based Compensation, Phantom Award, Activity	'
	Phantom Plan. In 2012, the Company adopted the Mueller Water Products, Inc. Phantom Plan (“Phantom Plan”). The Phantom Plan awards were awarded to certain non-officer employees. Outstanding phantom awards vest ratably on each anniversary date of the original grant for three years. Compensation expense for Phantom Plan awards is charged against income on a straight-line basis for each tranche of each award based on the closing price of our common stock at each balance sheet date. Phantom Plan awards are payable in cash and recorded as liability awards. The outstanding Phantom Plan awards had a fair value of $8.28 per award at September 30, 2014 and our liability for such awards was $3.4 million. Phantom Plan activity for 2014 is summarized below.
		Phantom Plan units			Weighted				Weighted		Aggregate
					average				average		intrinsic
					grant date				remaining		value
					fair value				contractual		(millions)
					per unit				term (years)
	Outstanding at September 30, 2011	—
	Granted	358,866			$	2.03
	Vested	—									$	—
	Cancelled	—			—
	Outstanding at September 30, 2012	358,866			2.03				1.2
	Granted	382,605			5.22
	Vested	(119,637	)								0.7
	Cancelled	(12,852	)		2.03
	Outstanding at September 30, 2013	608,982			4.03				1
	Granted	304,815			8.52
	Vested	(240,739	)								2.1
	Cancelled	(29,770	)		5.29
	Outstanding at September 30, 2014	643,288			$	6.22			0.8

Supplemental_Balance_Sheet_Inf1

Supplemental Balance Sheet Information (Tables)	12 Months Ended
	Sep. 30, 2014
Balance Sheet Related Disclosures [Abstract]	'
Schedule Of Selected Supplemental Balance Sheet Information [Table Text Block]	'
	Selected supplemental balance sheet information is presented below.
		September 30,
		2014			2013
		(in millions)
	Inventories:
	Purchased components and raw material	$	72		$	75.4
	Work in process	34.5			38.6
	Finished goods	91.5			94.5
		$	198		$	208.5
	Other current assets:
	Maintenance and repair tooling	$	22.6		$	22.5
	Income taxes	13			14.9
	U.S. Pipe-related workers' compensation and other reimbursements	1.6			2.2
	Other	6.9			6.5
		$	44.1		$	46.1
	Property, plant and equipment:
	Land	$	9.6		$	10.6
	Buildings	78			75.5
	Machinery and equipment	332.9			305.7
	Construction in progress	18.7			19.6
		439.2			411.4
	Accumulated depreciation	(292.9		)	(269.5		)
		$	146.3		$	141.9
	Other current liabilities:
	Compensation and benefits	$	39.5		$	37.3
	Customer rebates	16.9			15.5
	Interest	10.7			12
	Taxes other than income taxes	4.7			5
	Warranty	2.6			2.8
	Income taxes	0.7			1.3
	Restructuring	0.9			—
	Environmental	0.1			0.2
	Other	6.1			6.5
		$	82.2		$	80.6

Supplemental_Statement_of_Oper1

Supplemental Statement of Operations Information (Tables) (Tables)	12 Months Ended
	Sep. 30, 2014
Supplemental Income Statement Elements [Abstract]	'
Schedule of Operations, Supplemental Disclosures [Table Text Block]	'
	Selected supplemental statement of operations information is presented below.
		2014			2013			2012
		(in millions)
	Included in selling, general and administrative expenses:
	Research and development	$	14.4		$	14.8		$	12.7
	Advertising	$	4.7		$	5		$	4.9
	Interest expense, net:
	7.375% Senior Subordinated Notes	$	30.6		$	31		$	31
	8.75% Senior Unsecured Notes	16			16.8			19.3
	Deferred financing fees amortization	2			2			2.3
	ABL Agreement	1.2			1.5			3.2
	Interest rate swap contracts	—			—			5
	Other interest expense	0.2			0.7			(0.6		)
		50			52			60.2
	Interest income	(0.4		)	(0.3		)	(0.3		)
		$	49.6		$	51.7		$	59.9

Accumulated_Other_Comprehensiv

Accumulated Other Comprehensive Loss (Tables)	12 Months Ended
	Sep. 30, 2014
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]	'
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]	'
	Accumulated Other Comprehensive Loss
	Accumulated other comprehensive loss is presented below.
		Foreign currency translation			Minimum pension liability, net of tax			Total
					(in millions)
	Balance at September 30, 2013	$	6.8		$	(35.4	)	$	(28.6	)
	Current period other comprehensive loss	(4.4		)	(27.7		)	(32.1		)
	Balance at September 30, 2014	$	2.4		$	(63.1	)	$	(60.7	)
	Accumulated other comprehensive loss is presented below.
		Foreign currency translation			Minimum pension liability, net of tax			Total
					(in millions)
	Balance at September 30, 2013	$	6.8		$	(35.4	)	$	(28.6	)
	Current period other comprehensive loss	(4.4		)	(27.7		)	(32.1		)
	Balance at September 30, 2014	$	2.4		$	(63.1	)	$	(60.7	)

Supplemental_Cash_Flow_Informa1

Supplemental Cash Flow Information (Tables)	12 Months Ended
	Sep. 30, 2014
Supplemental Cash Flow Information [Abstract]	'
Schedule of Cash Flow, Supplemental Disclosures	'
	The impact these transactions had on our consolidated balance sheets is presented below.
		September 30,
		2014			2013			2012
		(in millions)
	Pension and other postretirement plans:
	Increase (decrease) in other noncurrent assets	$	—		$	0.3		$	(0.1	)
	Decrease (increase) in other noncurrent liabilities	(25.5		)	51.5			(36.2		)
	Decrease (increase) in other current liabilities	0.1			—			0.3
	Decrease (increase) in deferred tax liabilities	9.8			(20.1		)	(0.6		)
	Decrease (increase) in accumulated other comprehensive loss	15.6			(31.7		)	36.6
		$	—		$	—		$	—
	Cash paid (received), net:
	Interest	$	48.7		$	49.1		$	53.3
	Income taxes	$	2.6		$	0.7		$	(6.9	)

Segment_Information_Tables

Segment Information (Tables)	12 Months Ended
	Sep. 30, 2014
Segment Reporting [Abstract]	'
Schedule of Revenue from External Customers and Long-Lived Assets, by Geographical Areas	'
	Geographical area information is presented below.
		United States		Canada		Other			Total
		(in millions)
	Net sales:
	2014	$	1,040.70	$	101	$	43		$	1,184.70
	2013	971		101.5		48.3			1,120.80
	2012	872.3		112.4		39.2			1,023.90
	Property, plant and equipment, net:
	September 30, 2014	$	138.5	$	4.3	$	3.5		$	146.3
	September 30, 2013	133.6		4.7		3.6			141.9
Schedule Of Selected Supplemental Balance Sheet Information	'
	Summarized financial information for our segments is presented below.
		Mueller Co.		Anvil		Corporate			Total
		(in millions)
	Net sales, excluding intercompany:
	2014	$	783.3	$	401.4	$	—		$	1,184.70
	2013	729.5		391.3		—			1,120.80
	2012	652.4		371.5		—			1,023.90
	Intercompany sales:
	2014	$	6.7	$	0.1	$	—		$	6.8
	2013	7.4		0.1		—			7.5
	2012	7.3		0.1		—			7.4
	Operating income (loss):
	2014	$	122.3	$	41.3	$	(39.5	)	$	124.1
	2013	91.3		40.2		(34.2		)	97.3
	2012	57.7		37.3		(30.9		)	64.1
	Depreciation and amortization:
	2014	$	42.1	$	14.2	$	0.4		$	56.7
	2013	44.6		14.2		0.4			59.2
	2012	45.7		14.3		0.6			60.6
	Restructuring:
	2014	$	2.2	$	0.9	$	—		$	3.1
	2013	1.5		0.1		(0.1		)	1.5
	2012	2.5		0.3		—			2.8
	Capital expenditures:
	2014	$	24.9	$	11.6	$	0.4		$	36.9
	2013	24		12.3		0.2			36.5
	2012	20		11.4		—			31.4
	Total assets:
	September 30, 2014	$	835.8	$	263.9	$	217.4		$	1,317.10
	September 30, 2013	846.8		259.6		175.5			1,281.90
	Intangible assets, net:
	September 30, 2014	$	475.7	$	57.9	$	—		$	533.6
	September 30, 2013	491.6		61.5		—			553.1

Quarterly_Consolidated_Financi1

Quarterly Consolidated Financial Information (Unaudited) (Tables)	12 Months Ended
	Sep. 30, 2014
Quarterly Financial Information Disclosure [Abstract]	'
Schedule of Quarterly Financial Information	'
		Quarter
		Fourth			Third			Second			First
		(in millions, except per share amounts)
	2014:00:00
	Net sales	$	320.7		$	318.5		$	288.1		$	257.4
	Gross profit	$	101.3		$	97.3		$	82.2		$	67.1
	Operating income	$	43		$	41.8		$	25.3		$	14
	Net income	$	26.2		$	18.5		$	9.7		$	1.1
	Net income per basic share(1)	$	0.16		$	0.12		$	0.06		$	0.01
	Net income per diluted share(1)	$	0.16		$	0.11		$	0.06		$	0.01
	2013:00:00
	Net sales	$	293.2		$	299.4		$	283.1		$	245.1
	Gross profit	$	88.8		$	90		$	77.3		$	57.1
	Operating income	$	33.2		$	32.9		$	24.3		$	6.9
	Income (loss) from continuing operations	$	16.8		$	16		$	7.6		$	(5.0	)
	Income (loss) from discontinued operations	(3.3		)	(1.9		)	(1.4		)	12
	Net income	$	13.5		$	14.1		$	6.2		$	7
	Net income per basic share(1):
	Continuing operations	$	0.11		$	0.1		$	0.05		$	(0.03	)
	Discontinued operations	(0.02		)	(0.01		)	(0.01		)	0.07
	Net income	$	0.09		$	0.09		$	0.04		$	0.04
	Net income (loss) per diluted share(1):
	Continuing operations	$	0.1		$	0.1		$	0.05		$	(0.03	)
	Discontinued operations	(0.02		)	(0.01		)	(0.01		)	0.07
	Net income	$	0.08		$	0.09		$	0.04		$	0.04
	(1)	The sum of the quarterly amounts may not equal the full year amount due to rounding.

Consolidating_Guarantor_and_No1

Consolidating Guarantor and Non-Guarantor Financial Information (Tables)	12 Months Ended
	Sep. 30, 2014
Consolidating Guarantor And Non-Guarantor Financial Information [Abstract]	'
Schedule Of Guarantor Companies	'
	The following information is included as a result of the guarantee by certain of our 100% owned U.S. subsidiaries (“Guarantor Companies”) of the Senior Unsecured Notes and the Senior Subordinated Notes. None of our other subsidiaries or our industrial valve joint venture guarantee the Senior Unsecured Notes and the Senior Subordinated Notes. Each of the guarantees is joint and several and full and unconditional. Guarantor Companies are listed below.
	Name		State of
			incorporation
			or organization
	Anvil International, LLC		Delaware
	Echologics, LLC		Delaware
	Henry Pratt Company, LLC		Delaware
	Henry Pratt International, LLC		Delaware
	Hydro Gate, LLC		Delaware
	J.B. Smith Mfg. Co., LLC		Delaware
	James Jones Company, LLC		Delaware
	Milliken Valve, LLC		Delaware
	Mueller Co. LLC		Delaware
	Mueller Group, LLC		Delaware
	Mueller Group Co-Issuer, Inc.		Delaware
	Mueller International, L.L.C.		Delaware
	Mueller Property Holdings, LLC		Delaware
	Mueller Co. International Holdings, LLC		Delaware
	Mueller Service California, Inc.		Delaware
	Mueller Service Co., LLC		Delaware
	Mueller Systems, LLC		Delaware
	OSP, LLC		Delaware
	U.S. Pipe Valve & Hydrant, LLC		Delaware
	The consolidating statements of cash flows below present intercompany cash transfers as financing or investing cash flows, rather than as operating cash flows as was previously our practice. The prior years' presentations have been revised to conform to the current year presentation.
Schedule Of Consolidating Balance Sheet	'
	Mueller Water Products, Inc. and Subsidiaries
	Consolidating Balance Sheet
	30-Sep-14
		Issuer			Guarantor			Non-			Eliminations			Total
					companies			guarantor
								companies
								(in millions)
	Assets:
	Cash and cash equivalents	$	125.5		$	(2.1	)	$	37.7		$	—		$	161.1
	Receivables, net	0.1			166.4			15.6			—			182.1
	Inventories	—			187.4			10.6			—			198
	Deferred income taxes	38			—			0.6			—			38.6
	Other current assets	16.5			26			1.6			—			44.1
	Total current assets	180.1			377.7			66.1			—			623.9
	Property, plant and equipment	1.5			137			7.8			—			146.3
	Intangible assets	—			531.6			2			—			533.6
	Other noncurrent assets	11.7			0.3			1.3			—			13.3
	Investment in subsidiaries	263.2			41.3			—			(304.5		)	—
	Intercompany accounts	882.7			—			—			(882.7		)	—
	Total assets	$	1,339.20		$	1,087.90		$	77.2		$	(1,187.2	)	$	1,317.10
	Liabilities and equity:
	Current portion of long-term debt	$	45		$	1.2		$	—		$	—		$	46.2
	Accounts payable	4.5			105			6.5			—			116
	Other current liabilities	29.9			48.9			3.4			—			82.2
	Total current liabilities	79.4			155.1			9.9			—			244.4
	Long-term debt	498.3			1.1			—			—			499.4
	Deferred income taxes	149.9			—			0.5			—			150.4
	Other noncurrent liabilities	63.8			6.5			1			—			71.3
	Intercompany accounts	196.2			662			24.5			(882.7		)	—
	Total liabilities	987.6			824.7			35.9			(882.7		)	965.5
	Equity	351.6			263.2			41.3			(304.5		)	351.6
	Total liabilities and equity	$	1,339.20		$	1,087.90		$	77.2		$	(1,187.2	)	$	1,317.10
	Mueller Water Products, Inc. and Subsidiaries
	Consolidating Balance Sheet
	30-Sep-13
		Issuer			Guarantor			Non-			Eliminations			Total
					companies			guarantor
								companies
								(in millions)
	Assets:
	Cash and cash equivalents	$	86.6		$	(2.3	)	$	39.3		$	—		$	123.6
	Receivables, net	0.1			150.4			14			—			164.5
	Inventories	—			195.3			13.2			—			208.5
	Deferred income taxes	26.3			—			0.4			—			26.7
	Other current assets	18.2			25.7			2.2			—			46.1
	Total current assets	131.2			369.1			69.1			—			569.4
	Property, plant and equipment	1.5			132			8.4			—			141.9
	Intangible assets	—			551.3			1.8			—			553.1
	Other noncurrent assets	16			0.2			1.3			—			17.5
	Investment in subsidiaries	155.2			39.2			—			(194.4		)	—
	Intercompany accounts	882.7			—			—			(882.7		)	—
	Total assets	$	1,186.60		$	1,091.80		$	80.6		$	(1,077.1	)	$	1,281.90
	Liabilities and equity:
	Current portion of long-term debt	$	—		$	1.3		$	—		$	—		$	1.3
	Accounts payable	4.6			90			6.6			—			101.2
	Other current liabilities	29.7			46.6			4.3			—			80.6
	Total current liabilities	34.3			137.9			10.9			—			183.1
	Long-term debt	598			1.5			—			—			599.5
	Deferred income taxes	140.9			—			0.6			—			141.5
	Other noncurrent liabilities	21.3			7.5			0.8			—			29.6
	Intercompany accounts	63.9			789.7			29.1			(882.7		)	—
	Total liabilities	858.4			936.6			41.4			(882.7		)	953.7
	Equity	328.2			155.2			39.2			(194.4		)	328.2
Total liabilities and equity	$	1,186.60		$	1,091.80		$	80.6		$	(1,077.1	)	$	1,281.90
Schedule Of Consolidating Statement Of Operations	'
	Mueller Water Products, Inc. and Subsidiaries
	Consolidating Statement of Operations
	Year Ended September 30, 2014
		Issuer			Guarantor			Non-			Eliminations			Total
					companies			guarantor
								companies
								(in millions)
	Net sales	$	—		$	1,072.40		$	112.3		$	—		$	1,184.70
	Cost of sales	—			739.3			97.5			—			836.8
	Gross profit	—			333.1			14.8			—			347.9
	Operating expenses:
	Selling, general and administrative	39.1			171.2			10.4			—			220.7
	Restructuring	—			0.6			2.5			—			3.1
	Total operating expenses	39.1			171.8			12.9			—			223.8
	Operating income (loss)	(39.1		)	161.3			1.9			—			124.1
	Interest expense, net	49.7			0.2			(0.3		)	—			49.6
	Loss on early extinguishment of debt	1			—			—			—			1
	Income (loss) before income taxes	(89.8		)	161.1			2.2			—			73.5
	Income tax expense (benefit)	(41.9		)	59.4			0.5			—			18
	Equity in income of subsidiaries	103.4			1.7			—			(105.1		)	—
	Net income	$	55.5		$	103.4		$	1.7		$	(105.1	)	55.5
	Mueller Water Products, Inc. and Subsidiaries
	Consolidating Statement of Operations
	Year Ended September 30, 2013
		Issuer			Guarantor			Non-			Eliminations			Total
					companies			guarantor
								companies
								(in millions)
	Net sales	$	—		$	1,005.90		$	114.9		$	—		$	1,120.80
	Cost of sales	—			708.6			99			—			807.6
	Gross profit	—			297.3			15.9			—			313.2
	Operating expenses:
	Selling, general and administrative	34			168.2			12.2			—			214.4
	Restructuring	—			1.4			0.1			—			1.5
	Total operating expenses	34			169.6			12.3			—			215.9
	Operating income (loss)	(34.0		)	127.7			3.6			—			97.3
	Interest expense (income), net	51.6			0.3			(0.2		)	—			51.7
	Loss on early extinguishment of debt	1.4			—			—			—			1.4
	Income (loss) before income taxes	(87.0		)	127.4			3.8			—			44.2
	Income tax expense (benefit)	(17.3		)	25.5			0.6			—			8.8
	Equity in income of subsidiaries	105.1			3.2			—			(108.3		)	—
	Income from continuing operations	35.4			105.1			3.2			(108.3		)	35.4
	Income from discontinued operations	5.4			—			—			—			5.4
	Net income	$	40.8		$	105.1		$	3.2		$	(108.3	)	$	40.8
	Mueller Water Products, Inc. and Subsidiaries
	Consolidating Statement of Operations
	Year Ended September 30, 2012
		Issuer			Guarantor			Non-			Eliminations			Total
					companies			guarantor
								companies
								(in millions)
	Net sales	$	—		$	907		$	116.9		$	—		$	1,023.90
	Cost of sales	—			652.1			100.7			—			752.8
	Gross profit	—			254.9			16.2			—			271.1
	Operating expenses:
	Selling, general and administrative	30.6			160.2			13.4			—			204.2
	Restructuring	—			2.7			0.1			—			2.8
	Total operating expenses	30.6			162.9			13.5			—			207
	Operating income	(30.6		)	92			2.7			—			64.1
	Interest expense (income), net	60			0.2			(0.3		)	—			59.9
	Loss on early extinguishment of debt	1.5			—			—			—			1.5
	Income (loss) before income taxes	(92.1		)	91.8			3			—			2.7
	Income tax expense (benefit)	(28.3		)	35.6			0.6			—			7.9
Equity in income of subsidiaries	58.6			2.4			—			(61.0		)	—
Income (loss) from continuing operations	(5.2		)	58.6			2.4			(61.0		)	(5.2		)
Loss from discontinued operations, net of tax	(103.2		)	—			—			—			(103.2		)
Net income (loss)	$	(108.4	)	$	58.6		$	2.4		$	(61.0	)	$	(108.4	)
Schedule Of Consolidating Statement Of Other Comprehensive Income [Table Text Block]	'
	Mueller Water Products, Inc. and Subsidiaries
	Consolidating Statement of Comprehensive Income (Loss)
	Year Ended September 30, 2014
		Issuer			Guarantor			Non-			Eliminations			Total
					companies			guarantor
								companies
								(in millions)
	Net income	$	55.5		$	103.4		$	1.7		$	(105.1	)	$	55.5
	Other comprehensive income (loss):
	Minimum pension liability, net of tax	(27.7		)	—			—			—			(27.7		)
	Equity in other comprehensive loss of subsidiaries	(4.4		)	(4.4		)	—			8.8			—
	Foreign currency translation	—			—			(4.4		)	—			(4.4		)
		(32.1		)	(4.4		)	(4.4		)	8.8			(32.1		)
	Comprehensive income (loss)	$	23.4		$	99		$	(2.7	)	$	(96.3	)	$	23.4
	Mueller Water Products, Inc. and Subsidiaries
	Consolidating Statement of Comprehensive Income
	Year Ended September 30, 2013
		Issuer			Guarantor			Non-			Eliminations			Total
					companies			guarantor
								companies
								(in millions)
	Net income	$	40.8		$	105.1		$	3.2		$	(108.3	)	$	40.8
	Other comprehensive income (loss):
	Minimum pension liability, net of tax	61.5			—			—			—			61.5
	Equity in other comprehensive income of subsidiaries	(2.4		)	(2.4		)	—			4.8			—
	Foreign currency translation	—			—			(2.4		)	—			(2.4		)
		59.1			(2.4		)	(2.4		)	4.8			59.1
	Comprehensive income	$	99.9		$	102.7		$	0.8		$	(103.5	)	$	99.9
	Mueller Water Products, Inc. and Subsidiaries
	Consolidating Statement of Comprehensive Income (Loss)
	Year Ended September 30, 2012
		Issuer			Guarantor			Non-			Eliminations			Total
					companies			guarantor
								companies
								(in millions)
	Net income (loss)	$	(108.4	)	$	58.6		$	2.4		$	(61.0	)	$	(108.4	)
	Other comprehensive income (loss):
	Minimum pension liability, net of tax	(39.4		)	—			—			—			(39.4		)
	Interest rate swap contracts, net of tax	3			—			—			—			3
	Equity in other comprehensive loss of subsidiaries	2.9			2.9						(5.8		)	—
	Foreign currency translation	—			—			2.9			—			2.9
		(33.5		)	2.9			2.9			(5.8		)	(33.5		)
	Comprehensive income (loss)	$	(141.9	)	$	61.5		$	5.3		$	(66.8	)	$	(141.9	)
Schedule Of Consolidating Statement Of Cash Flow	'
	Mueller Water Products, Inc. and Subsidiaries
	Consolidating Statement of Cash Flows
	Year Ended September 30, 2014
		Issuer			Guarantor			Non-			Eliminations			Total
					companies			guarantor
								companies
								(in millions)
	Operating activities:
	Net cash provided by (used in) operating activities	$	(108.0	)	$	256.5		$	(0.9	)	$	—		$	147.6
	Investing activities:
	Capital expenditures	(0.2		)	(35.3		)	(1.4		)	—			(36.9		)
	Business acquisitions, net of cash acquired	—			(11.7		)	—			1.7			(10.0		)
	Proceeds from sales of assets	—			4.7			—			—			4.7
	Intercompany	—			(213.3		)	—			213.3			—
	Net cash used in investing activities	(0.2		)	(255.6		)	(1.4		)	215			(42.2		)
	Financing activities:
	Debt paid	(55.7		)	—			—			—			(55.7		)
	Dividends paid	(11.2		)	—			—			—			(11.2		)
	Common stock issued	4.2			—			—			—			4.2
	Shares retained for employee taxes	(3.1		)	—			—			—			(3.1		)
	Joint venture capital contributed	—			—			3.4			(1.7		)	1.7
	Intercompany	213.3			—			—			(213.3		)	—
	Other	(0.4		)	(0.7		)	—			—			(1.1		)
	Net cash provided by (used in) financing activities	147.1			(0.7		)	3.4			(215.0		)	(65.2		)
	Effect of currency exchange rate changes on cash	—			—			(2.7		)	—			(2.7		)
	Net change in cash and cash equivalents	38.9			0.2			(1.6		)	—			37.5
	Cash and cash equivalents at beginning of year	86.6			(2.3		)	39.3			—			123.6
	Cash and cash equivalents at end of year	$	125.5		$	(2.1	)	$	37.7		$	—		$	161.1
	Mueller Water Products, Inc. and Subsidiaries
	Consolidating Statement of Cash Flows
	Year Ended September 30, 2013
		Issuer			Guarantor			Non-			Eliminations			Total
					companies			guarantor
								companies
								(in millions)
	Operating activities:
	Net cash provided by (used in) operating activities from continuing operations	$	(102.7	)	$	207.8		$	9		$	—		$	114.1
	Investing activities:
	Capital expenditures	(0.2		)	(34.4		)	(1.9		)	—			(36.5		)
	Business acquisitions, net of cash acquired	—			(0.2		)	—			—			(0.2		)
	Proceeds from sales of assets	—			0.5			—			—			0.5
	Intercompany	—			(169.9		)	—			169.9			—
	Net cash used in investing activities from continuing operations	(0.2		)	(204.0		)	(1.9		)	169.9			(36.2		)
	Financing activities:
	Debt paid	(23.2		)	—			—			—			(23.2		)
	Dividends paid	(11.0		)	—			—			—			(11.0		)
	Common stock issued	3.1			—			—			—			3.1
	Shares retained for employee taxes	(1.5		)	—			—			—			(1.5		)
	Payment of deferred financing fees	(0.7		)	—			—			—			(0.7		)
	Intercompany	169.9			—			—			(169.9		)	—
	Other	—			(2.4		)	—			—			(2.4		)
	Net cash provided by (used in) financing activities from continuing operations	136.6			(2.4		)	—			(169.9		)	(35.7		)
	Net cash flows from discontinued operations:
	Operating activities	(4.9		)	—			—			—			(4.9		)
	Investing activities	4.5			—			—			—			4.5
	Net cash provided by discontinued operations	(0.4		)	—			—			—			(0.4		)
	Effect of currency exchange rate changes on cash	—			—			(1.2		)	—			(1.2		)
	Net change in cash and cash equivalents	33.3			1.4			5.9			—			40.6
	Cash and cash equivalents at beginning of year	53.3			(3.7		)	33.4			—			83
	Cash and cash equivalents at end of year	$	86.6		$	(2.3	)	$	39.3		$	—		$	123.6
	Mueller Water Products, Inc. and Subsidiaries
	Consolidating Statement of Cash Flows
	Year Ended September 30, 2012
	Issuer			Guarantor			Non-			Eliminations			Total
				companies			guarantor
							companies
							(in millions)
Operating activities:
Net cash provided by (used in) operating activities from continuing operations	$	(112.9	)	$	186		$	3.7		$	—		$	76.8
Investing activities:
Capital expenditures	—			(30.5		)	(0.9		)	—			(31.4		)
Business acquisitions, net of cash acquired	—			(1.8		)	0.5			—			(1.3		)
Proceeds from sales of assets	—			0.3			—			—			0.3
Intercompany	—			(153.8		)	—			153.8			—
Net cash provided by (used in) investing activities from continuing operations	—			(185.8		)	(0.4		)	153.8			(32.4		)
Financing activities:
Debt paid	(57.2		)	—			—			—			(57.2		)
Dividends paid	(11.0		)	—			—			—			(11.0		)
Common stock issued	0.7			—			—			—			0.7
Shares retained for employee taxes	(0.5		)	—			—			—			(0.5		)
Intercompany	153.8			—			—			(153.8		)	—
Other	—			(0.1		)	—			—			(0.1		)
Net cash provided by (used in) financing activities from continuing operations	85.8			(0.1		)	—			(153.8		)	(68.1		)
Net cash flows from discontinued operations:
Operating activities	(43.3		)	—			—			—			(43.3		)
Investing activities	87.5			—			—			—			87.5
Net cash used in discontinued operations	44.2			—			—			—			44.2
Effect of currency exchange rate changes on cash	—			—			1.5			—			1.5
Net change in cash and cash equivalents	17.1			0.1			4.8			—			22
Cash and cash equivalents at beginning of year	36.2			(3.8		)	28.6			—			61
Cash and cash equivalents at end of year	$	53.3		$	(3.7	)	$	33.4		$	—		$	83

Organization_Details

Organization (Details) (USD $)	0 Months Ended	12 Months Ended
In Millions, unless otherwise specified	Jul. 31, 2014	Sep. 30, 2014
		business_segments
Organization, Consolidation and Presentation of Financial Statements [Abstract]	'	'
Organization	'	'
		Organization
		Mueller Water Products, Inc., a Delaware corporation, together with its consolidated subsidiaries, operates in two business segments: Mueller Co. and Anvil. Mueller Co. manufactures valves for water and gas systems, including butterfly, iron gate, tapping, check, knife, plug and ball valves, as well as dry-barrel and wet-barrel fire hydrants and metering systems, and provides leak detection and pipe condition assessment products and services for the water infrastructure industry. Anvil manufactures and sources a broad range of products, including a variety of fittings, couplings, hangers and related products. The “Company,” “we,” “us” or “our” refer to Mueller Water Products, Inc. and its subsidiaries. With regard to the Company's segments, “we,” “us” or “our” may also refer to the segment being discussed.
		On July 31, 2014, Mueller Co. acquired a 49% ownership in an industrial valve joint-venture for $1.7 million. Due to substantive control features in the joint-venture agreement, all of its assets, liabilities and results of operations are included in our consolidated financial statements. In 2014, we presented the loss of $0.1 million attributable to noncontrolling interest in selling, general and administrative expenses. Noncontrolling interest is recorded at its carrying value, which approximates fair value.
		On April 1, 2012, we sold our former U.S. Pipe segment to USP Holdings Inc., an affiliate of Wynnchurch Capital, Ltd. U.S. Pipe's results of operations have been reclassified as discontinued operations, and its assets and liabilities reclassified as held for sale, for all prior periods.
		Our consolidated financial statements are prepared in conformity with accounting principles generally accepted in the United States of America (“GAAP”), which require us to make certain estimates and assumptions that affect the reported amounts of assets, liabilities, sales and expenses and the disclosure of contingent assets and liabilities for the reporting periods. Actual results could differ from those estimates. All significant intercompany balances and transactions have been eliminated. Certain reclassifications have been made to previously reported amounts to conform to the current presentation.
		Unless the context indicates otherwise, whenever we refer to a particular year, we mean our fiscal year ended or ending September 30 in that particular calendar year.
Number of Reportable Segments	'	2
Variable Interest Entity, Qualitative or Quantitative Information, Ownership Percentage	49.00%	'
Payments to Acquire Interest in Joint Venture	'	$1.70

Summary_of_Significant_Account3

Summary of Significant Accounting Policies (Schedule of Allowance for Doubtful Receivables) (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012
Allowance for Doubtful Accounts Receivable [Roll Forward]	'	'	'
Balance at beginning of year	$5.30	$5.70	$4.80
Provision charged (credited) to expense	0	0.4	0.6
Balances written off, net of recoveries	-0.1	-0.8	-0.1
Reclassifications	0.1	0	0.4
Balance at end of year	$5.30	$5.30	$5.70

Summary_of_Significant_Account4

Summary of Significant Accounting Policies (Schedule of Reserves for Excess and Obsolete Inventory) (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2014
Valuation and Qualifying Accounts Disclosure [Line Items]	'	'	'	'
Balance at beginning of year	$10.60	$12.50	$12.70	$8.50
Provision charged to expense	-2.8	-2.4	-1.8	'
Inventory disposed	-4.3	-4.6	-2.2	'
Valuation Allowances and Reserves, Adjustments	($0.60)	$0.30	$0.20	'

Summary_of_Significant_Account5

Summary of Significant Accounting Policies (Schedule of Product Warranty Liability) (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012
Movement in Standard Product Warranty Accrual [Roll Forward]	'	'	'
Balance at beginning of year	$2.80	$1.60	$2
Warranty expense	4.1	4.2	1.4
Warranty payments	-4.3	-3	-1.8
Balance at end of year	$2.60	$2.80	$1.60

Summary_of_Significant_Account6

Summary of Significant Accounting Policies (Narrative) (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013
Asset Retirement Obligation	$3.20	$3.60
Exposure to Workers Compensation Claims, Per Incident	1	'
Workers Compensation Undiscounted Basis Liability	17	20
Workers' Compensation Liability	14.7	17.2
Income Tax Benefit, Likelihood of Realization Threshold	50.00%	'
Deferred Finance Costs, Net	6.7	'
Minimum [Member]	'	'
Finite-Lived Tangible Asset, Useful Life, Maximum	'3 years	'
Debt Instrument, Term	'5 years	'
Maximum [Member]	'	'
Finite-Lived Tangible Asset, Useful Life, Maximum	'10 years	'
Debt Instrument, Term	'10 years	'
Land Improvements [Member] | Minimum [Member]	'	'
Property, Plant and Equipment, Useful Life, Minimum	'10 years	'
Land Improvements [Member] | Maximum [Member]	'	'
Property, Plant and Equipment, Useful Life, Minimum	'20 years	'
Building [Member] | Minimum [Member]	'	'
Property, Plant and Equipment, Useful Life, Minimum	'10 years	'
Building [Member] | Maximum [Member]	'	'
Property, Plant and Equipment, Useful Life, Minimum	'40 years	'
Machinery and Equipment [Member] | Minimum [Member]	'	'
Property, Plant and Equipment, Useful Life, Minimum	'3 years	'
Machinery and Equipment [Member] | Maximum [Member]	'	'
Property, Plant and Equipment, Useful Life, Minimum	'15 years	'
Software and Software Development Costs [Member] | Minimum [Member]	'	'
Property, Plant and Equipment, Useful Life, Minimum	'3 years	'
Software and Software Development Costs [Member] | Maximum [Member]	'	'
Property, Plant and Equipment, Useful Life, Minimum	'6 years	'
U.S. Pipe [Member] | Maximum [Member]	'	'
Discontinued Operations, Receivable from Buyer of Discontinued Operation	6.5	11.8
Other Current Assets [Member] | U.S. Pipe [Member]	'	'
Discontinued Operations, Receivable from Buyer of Discontinued Operation	1.6	'
Other Noncurrent Assets [Member] | U.S. Pipe [Member]	'	'
Discontinued Operations, Receivable from Buyer of Discontinued Operation	4	'
ABL Agreement [Member]	'	'
Deferred Finance Costs, Net	2.1	'
Seven Point Three Seven Five Senior Subordinated Notes [Member]	'	'
Deferred Finance Costs, Net	2.8	'
Eight Point Seven Five Senior Unsecured Notes [Member]	'	'
Deferred Finance Costs, Net	$1.80	'

Identifiable_Intangible_Assets2

Identifiable Intangible Assets (Details) (USD $)	3 Months Ended	9 Months Ended	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Sep. 30, 2014	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012
Indefinite-lived intangible assets:	'	'	'	'	'
Intangible Assets, Gross (Excluding Goodwill)	'	$780.60	$780.60	$778.20	'
Accumulated amortization:	'	'	'	'	'
Accumulated amortization	'	-261.3	-261.3	-233	'
Net book value	'	533.6	533.6	553.1	'
Goodwill	'	5.4	5.4	0	'
Total intangible assets net book value	'	533.6	533.6	553.1	'
Amortization	'	'	29.4	31.8	30.9
Business Combination-Related Identifiable Intangible [Member]	'	'	'	'	'
Accumulated amortization:	'	'	'	'	'
Net book value	'	519.3	519.3	545.2	'
Remaining weighted-average amortization period for the finite-lived intangible assets	'	'	'9 years 1 month 7 days	'	'
Amortization	'	'	28.3	29.5	29.4
Future Amortization Expense, 2014	'	27.7	27.7	'	'
Future Amortization Expense, 2015	'	22.2	22.2	'	'
Future Amortization Expense, 2016	'	22.2	22.2	'	'
Future Amortization Expense, 2017	'	22.4	22.4	'	'
Future Amortization Expense, 2018	'	22.3	22.3	'	'
Trademarks and Trade Names [Member]	'	'	'	'	'
Indefinite-lived intangible assets:	'	'	'	'	'
Trade names and trademarks	'	300	300	300	'
Software and Software Development Costs [Member]	'	'	'	'	'
Capitalized external-use software:	'	'	'	'	'
Software cost	'	14.3	14.3	12.2	'
Software accumulated amortization	'	-5.4	-5.4	-4.3	'
Software net book value	'	8.9	8.9	7.9	'
Accumulated amortization:	'	'	'	'	'
Remaining weighted-average amortization period for the finite-lived intangible assets	'3 years	'6 years	'	'	'
Capitalized software, weighted average remaining useful life	'	'	'4 years 10 months	'	'
Amortization	'	'	1.1	2.3	1.5
Future Amortization Expense, 2014	'	1.5	1.5	'	'
Future Amortization Expense, 2015	'	1.8	1.8	'	'
Future Amortization Expense, 2016	'	1.8	1.8	'	'
Future Amortization Expense, 2017	'	1.5	1.5	'	'
Future Amortization Expense, 2018	'	1.2	1.2	'	'
Technology-Based Intangible Assets [Member]	'	'	'	'	'
Finite-Lived Intangible Assets, Net [Abstract]	'	'	'	'	'
Technology intangible assets	'	80.4	80.4	80.1	'
Accumulated amortization:	'	'	'	'	'
Accumulated amortization	'	-68.1	-68.1	-61.5	'
Customer Relationships [Member]	'	'	'	'	'
Finite-Lived Intangible Assets, Net [Abstract]	'	'	'	'	'
Customer relationships and other	'	400.2	400.2	398.1	'
Accumulated amortization:	'	'	'	'	'
Accumulated amortization	'	($193.20)	($193.20)	($171.50)	'

Discontinued_Operations_Assets2

Discontinued Operations, Assets Held for Sale and Divestitures (Details) (USD $)	12 Months Ended			0 Months Ended	6 Months Ended	12 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012	Apr. 02, 2012	Mar. 31, 2014	Sep. 30, 2014
				U.S. Pipe [Member]	U.S. Pipe [Member]	U.S. Pipe [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]	'	'	'	'	'	'
Asset Impairment Charges	$1.50	'	'	'	'	'
Multiemployer Plans, Withdrawal Obligation	0.9	'	'	'	'	'
Operating expenses (income)	'	-0.5	4.2	'	'	'
Gain (Loss) on Sale of Assets and Asset Impairment Charges	2.5	'	'	'	'	'
Discontinued Operations, Sales Price, Noncash	'	'	'	'	10.1	'
Proceeds from Divestiture of Businesses	'	'	'	$94	'	$4.50

Discontinued_Operations_Assets3

Discontinued Operations, Assets Held for Sale and Divestitures (Schedule Of Book Values Of Assets Sold And Fair Value Of Assets Acquired) (Details) (USD $)	3 Months Ended				12 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]	'	'	'	'	'	'	'
Net sales	'	'	'	'	'	$0	$197
Cost of sales	'	'	'	'	'	0	197.9
Gross loss	'	'	'	'	'	0	-0.9
Operating expenses (income)	'	'	'	'	'	-0.5	4.2
Operating income (loss)	'	'	'	'	'	0.5	-5.1
Interest expense	'	'	'	'	'	0	0.3
Loss (gain) on sale of discontinued operations	'	'	'	'	'	4.9	-119.7
Discontinued Operation, Tax Effect of Discontinued Operation	'	'	'	'	'	0	-21.9
Income (loss) from discontinued operations, net of tax	($3.30)	($1.90)	($1.40)	$12	$0	$5.40	($103.20)

Income_Taxes_Narrative_Details

Income Taxes (Narrative) (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2010	Sep. 30, 2009	Sep. 30, 2008	Sep. 30, 2007
Income Tax Expense (Benefit)	$18	$8.80	$7.90	'	'	'	'
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Amount of Unrecorded Benefit	0.8	'	'	'	'	'	'
Income Tax Examination, Year under Examination	'	'	'	'2010	'2009	'2008	'2007
Undistributed foreign earnings	58.1	'	'	'	'	'	'
Accrued interest related to uncertain tax positions	0.7	0.9	'	'	'	'	'
Income Tax Examination, Penalties and Interest Expense	$0	'	'	'	'	'	'
State and Local Jurisdiction [Member] | Minimum [Member]	'	'	'	'	'	'	'
Operating Loss Carryforwards, Expiration Date	31-Dec-15	'	'	'	'	'	'
State and Local Jurisdiction [Member] | Maximum [Member]	'	'	'	'	'	'	'
Operating Loss Carryforwards, Expiration Date	31-Dec-33	'	'	'	'	'	'
Internal Revenue Service (IRS) [Member] | Minimum [Member]	'	'	'	'	'	'	'
Operating Loss Carryforwards, Expiration Date	31-Dec-31	'	'	'	'	'	'
Internal Revenue Service (IRS) [Member] | Maximum [Member]	'	'	'	'	'	'	'
Operating Loss Carryforwards, Expiration Date	31-Dec-32	'	'	'	'	'	'

Income_Taxes_Income_before_Inc

Income Taxes (Income before Income Tax, Domestic and Foreign) (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012
Income Tax Disclosure [Abstract]	'	'	'
Loss before income taxes, U.S.	$71.60	$41	($0.10)
Loss before income taxes, Non-U.S.	1.9	3.2	2.8
Net Income Before Income Tax	$73.50	$44.20	$2.70

Income_Taxes_Components_of_Inc

Income Taxes (Components of Income Tax Expense (Benefit) (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012
Current:	'	'	'
Current Federal Tax Expense (Benefit)	$0.10	$0.60	$0.20
Current State and Local Tax Expense (Benefit)	1.6	0.1	-1
Current Foreign Tax Expense (Benefit)	0.7	0.8	1.1
Current Income Tax Expense (Benefit)	2.4	1.5	0.3
Deferred:	'	'	'
Deferred Federal Income Tax Expense (Benefit)	28.7	6.2	-0.6
Deferred State and Local Income Tax Expense (Benefit)	-12.8	1.3	9
Deferred Foreign Income Tax Expense (Benefit)	-0.3	-0.2	-0.8
Deferred Income Tax Expense (Benefit)	15.6	7.3	7.6
Income Tax Expense (Benefit)	$18	$8.80	$7.90

Income_Taxes_Disposal_Groups_i

Income Taxes (Disposal Groups, including Discontinued Operations) (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]	'	'	'
Income Tax Expense (Benefit)	$18	$8.80	$7.90
Discontinued Operations [Member]	'	'	'
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]	'	'	'
Expense from operations	'	2.1	-48.7
Valuation Allowance, Deferred Tax Asset, Change in Amount	'	-2.1	26.7
Other items	'	0	0.1
Operating Expense [Member]	'	'	'
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]	'	'	'
Expense from operations	30.1	17.5	1.4
Valuation Allowance, Deferred Tax Asset, Change in Amount	-9.6	-8.5	6.5
Other items	-2.5	'	'
Income Tax Expense (Benefit)	$18	'	'

Income_Taxes_Reconciliation_of

Income Taxes (Reconciliation of Statutory Taxes to Effective Taxes) (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012
Income Tax Disclosure [Abstract]	'	'	'
Tax at U.S. federal statutory income tax rate of 35%	$25.70	$15.50	$0.90
Adjustments to reconcile to income tax expense (benefit):	'	'	'
Federal Valuation Allowance	-1.2	-7.8	0
Effective Income Tax Rate Reconciliation, Change in State Deferred TAx Assets Valuation Allowance, Amount.	-8.4	-1.1	5.9
State income taxes, net of federal benefit	3.6	2	-0.8
State tax rate change	-2.5	0	0
State valuation allowance, net of federal benefit	-0.6	-0.3	0.2
Tax Credits	-0.1	-0.6	-0.1
Other nondeductible expenses	0.9	0.5	0.7
Foreign income taxes	-0.2	0.4	-0.3
Nondeductible compensation	0.8	0.2	1.4
Income Tax Expense (Benefit)	$18	$8.80	$7.90

Income_Taxes_Deferred_Tax_Asse

Income Taxes (Deferred Tax Assets and Liabilities) (Details) (USD $)	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012
In Millions, unless otherwise specified
Deferred income tax assets:	'	'	'
Inventory reserves	$15.20	$17.20	'
Accrued expenses	15.3	17.2	'
Pension and other postretirement benefits	20.3	2.4	'
Stock-based compensation	10.7	9.1	'
State net operating losses	10.3	13.4	'
Federal net operating losses and credit carryovers	6.8	37.4	'
All other	1.9	1.6	'
Deferred income tax assets	80.5	98.3	'
Valuation allowance	-0.7	-10.3	-49.2
Total deferred income tax assets	79.8	88	'
Deferred income tax liabilities:	'	'	'
Identifiable intangible assets	-190.1	-199.8	'
Other	-1.5	-3	'
Total deferred income tax liabilities	191.6	202.8	'
Deferred Tax Liabilities, Net	$111.80	$114.80	'

Income_Taxes_Summary_of_Valuat

Income Taxes (Summary of Valuation Allowance) (Details) (USD $)	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
In Millions, unless otherwise specified				Continuing Operations [Member]	Continuing Operations [Member]	Discontinued Operations [Member]	Discontinued Operations [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Other Assets [Member]	Other Assets [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]	'	'	'	'	'	'	'	'	'	'	'
Balance at beginning of year	$0.70	$10.30	$49.20	'	'	'	'	'	'	'	'
Valuation Allowance, Deferred Tax Asset, Change in Amount	'	'	'	-9.6	-8.5	0	-2.1	0	-27.8	0	-0.5
Balance at end of year	$0.70	$10.30	$49.20	'	'	'	'	'	'	'	'

Income_Taxes_Gross_Unrecognize

Income Taxes (Gross Unrecognized Tax Benefit) (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013
Unrecognized Tax Benefits [Roll Forward]	'	'
Balance at beginning of year	$3.70	$4.30
Increases related to prior year positions	0	0.5
Decreases due to lapse in statute of limitations	-1	-1.1
Balance at end of year	$2.70	$3.70

Income_Taxes_Income_Taxes_Pare

Income Taxes Income Taxes (Parenthetical) (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2010	Sep. 30, 2009	Sep. 30, 2008	Sep. 30, 2007
Income Tax Disclosure [Abstract]	'	'	'	'	'
Income Tax Examination, Penalties and Interest Expense	$0	'	'	'	'
Income Tax Examination, Year under Examination	'	'2010	'2009	'2008	'2007

Borrowing_Arrangements_Narrati

Borrowing Arrangements (Narrative) (Details) (USD $)

12 Months Ended

12 Months Ended

0 Months Ended

3 Months Ended

12 Months Ended

12 Months Ended

12 Months Ended

3 Months Ended

3 Months Ended

In Millions, unless otherwise specified

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2012

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2013

Aug. 29, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Dec. 31, 2014

Nov. 25, 2014

Dec. 31, 2014

Swing Line Loans [Member]

Letter Of Credit [Member]

Eight Point Seven Five Senior Unsecured Notes [Member]

Eight Point Seven Five Senior Unsecured Notes [Member]

Seven Point Three Seven Five Senior Subordinated Notes [Member]

Seven Point Three Seven Five Senior Subordinated Notes [Member]

Seven Point Three Seven Five Senior Subordinated Notes [Member]

Seven Point Three Seven Five Senior Subordinated Notes [Member]

ABL Agreement [Member]

ABL Agreement [Member]

Minimum [Member]

Maximum [Member]

London Interbank Offered Rate (LIBOR) [Member]

London Interbank Offered Rate (LIBOR) [Member]

Base Rate [Member]

Base Rate [Member]

Subsequent Event [Member]

Subsequent Event [Member]

Subsequent Event [Member]

Minimum [Member]

Maximum [Member]

Minimum [Member]

Maximum [Member]

London Interbank Offered Rate (LIBOR) [Member]

London Interbank Offered Rate (LIBOR) [Member]

London Interbank Offered Rate (LIBOR) [Member]

ABL Agreement [Member]

ABL Agreement [Member]

ABL Agreement [Member]

ABL Agreement [Member]

Long-term Debt, Type [Member]

Long-term Debt, Type [Member]

Minimum [Member]

Long-term Debt, Type [Member]

Long-term Debt

$545.60

$600.80

'

'

'

$178.30

$178

'

$365

$365

$420

$0

$0

'

'

'

'

'

'

'

$500

'

Debt Instrument, Description of Variable Rate Basis

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

0.75%

Revolving credit facility amount

'

'

'

25

60

'

'

'

'

'

'

225

'

'

'

'

'

'

'

'

'

'

Potential increase size of the credit facility by an additional amount

'

'

'

'

'

'

'

'

'

'

'

150

'

'

'

'

'

'

'

'

'

'

Borrowing rate in addition to LIBOR

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

17500.00%

22500.00%

7500.00%

12500.00%

32500.00%

'

'

Debt Instrument, Maturity Date Range, Start

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

31-Mar-15

'

'

Debt Instrument, Periodic Payment, Principal

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

1.25

'

'

Line of Credit Facility, Interest Rate at Period End

'

'

'

'

'

'

'

'

'

'

'

17500.00%

'

'

'

'

'

'

'

'

'

'

Agreement termination date

18-Dec-17

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Aggregate commitments availability

'

'

'

'

'

'

'

'

'

'

'

22.5

'

'

'

'

'

'

'

'

'

'

Aggregate commitments availability, percentage

'

'

'

'

'

'

'

'

'

'

'

10.00%

'

'

'

'

'

'

'

'

'

'

Outstanding letter of credit accrued fees and expenses

'

'

'

'

'

'

'

'

'

'

'

29.1

'

'

'

'

'

'

'

'

'

'

Excess availability reduced by outstanding borrowings, outstanding letters of credit and accrued fees and expenses

'

'

'

'

'

'

'

'

'

'

'

158.3

'

'

'

'

'

'

'

'

'

'

Senior subordinated notes bear interest

'

'

'

'

'

8.75%

'

'

7.38%

7.38%

'

'

'

'

'

'

'

'

'

'

'

'

Debt Instrument, Maturity Date

'

'

'

'

'

1-Sep-20

'

'

'

1-Jun-17

'

'

'

'

'

'

'

'

'

'

'

'

Line of Credit Facility, Unused Capacity, Commitment Fee Percentage

'

'

'

'

'

'

'

'

'

'

'

3750.00%

'

2500.00%

3750.00%

'

'

'

'

'

'

'

Unamortized discount

'

'

'

'

'

1.7

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Subordinated notes fair value

'

'

'

'

'

193.5

'

'

369.6

369.6

'

'

'

'

'

'

'

'

'

'

'

'

Extinguishment of Debt, Amount

22.5

'

'

'

'

'

'

55

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Debt Instrument, Redemption Price, Percentage

103.00%

'

'

'

'

'

'

101.23%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Loss on early extinguishment of debt

1

1.4

1.5

'

'

'

'

'

-1

'

'

'

'

'

'

'

'

'

'

-31.3

'

'

Future maturities of outstanding borrowings

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

CY plus 1

46.2

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

CY plus 2

0.8

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

CY plus 3

320.3

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

CY plus 4

0

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

CY plus 5

0

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

CY plus 6 and more

180

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Debt Instrument, Term

'

'

'

'

'

'

'

'

'

'

'

'

'

'5 years

'10 years

'

'

'

'

'7 years

'

'

Payments of Debt Extinguishment Costs

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

50

'

'

Payments of Financing Costs

$0

$0.70

$0

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

$8

'

'

Borrowing_Arrangements_Compone

Borrowing Arrangements (Components Of Long-Term Debt) (Details) (USD $)	Sep. 30, 2014	Sep. 30, 2013
In Millions, unless otherwise specified
Debt instrument	$545.60	$600.80
Current portion of long-term debt	46.2	1.3
Long-term debt	499.4	599.5
ABL Agreement [Member]	'	'
Debt instrument	0	0
8.75% Senior Unsecured Notes [Member]	'	'
Debt instrument	178.3	178
7.375% Senior Subordinated Notes [Member]	'	'
Debt instrument	365	420
Other [Member]	'	'
Debt instrument	$2.30	$2.80

Retirement_Plans_Narrative_Det

Retirement Plans (Narrative) (Details) (USD $)

12 Months Ended

3 Months Ended

12 Months Ended

12 Months Ended

In Millions, unless otherwise specified

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2012

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2012

Sep. 30, 2013

Sep. 30, 2012

Apr. 02, 2014

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2015

Minimum [Member]

Maximum [Member]

Pension Plan, Defined Benefit [Member]

Pension Plan, Defined Benefit [Member]

Pension Plan, Defined Benefit [Member]

Pension Plan, Defined Benefit [Member]

Other Plans [Member]

Other Plans [Member]

Other Plans [Member]

Equity Securities [Member]

Fixed Income Funds [Member]

Scenario, Forecast [Member]

Defined Benefit Plan Disclosure [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Percentage of Obligations Related to U.S. Plan

98.00%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Pension Contributions

'

'

'

'

'

'

'

'

'

'

'

'

'

'

$1

Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate

'

'

'

'

'

4.49%

4.49%

5.16%

4.21%

'

4.22%

5.00%

'

'

'

Defined Benefit Plan, Target Plan Asset Allocations

100.00%

'

'

'

'

'

'

'

'

'

'

'

40.00%

60.00%

'

Curtailment gain (loss)

'

'

'

'

'

'

'

0.2

'

7.4

2.4

'

'

'

'

Decrease in accumulated other comprehensive loss net of tax

-27.7

61.5

-39.4

'

'

'

0.3

'

'

'

'

'

'

'

'

Discount rate

'

'

'

'

'

5.16%

'

4.21%

5.66%

'

5.69%

'

'

'

'

Defined Benefit Plan Expected Return on Plan Assets Major Asset Classes Time Horizon

'

'

'

'10

'15

'

'

'

'

'

'

'

'

'

'

Defined Contribution Plan, Cost Recognized

$5.60

$5.10

$4.70

'

'

'

'

'

'

'

'

'

'

'

'

Percentage of Assets Related to U.S. Plan

97.00%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Retirement_Plans_Net_Periodic_

Retirement Plans (Net Periodic Benefit Cost) (Details) (Pension Plan, Defined Benefit [Member], USD $)	12 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012
Pension Plan, Defined Benefit [Member]	'	'	'
Service cost	$1.70	$2	$1.80
Interest cost	19.9	18.3	20.2
Expected return on plan assets	-23.8	-25.1	-24
Amortization of prior service cost (gain)	0	0	0.6
Amortization of net loss (gain)	3.5	9	6
Curtailment / special settlement loss (gain)	0.1	0.1	0.2
Costs allocated to discontinued operations	0	0	1.1
Other	0.1	0	0
Defined Benefit Plan, Net Periodic Benefit Cost	$1.50	$4.30	$3.70

Retirement_Plans_Accumulated_a

Retirement Plans (Accumulated and Projected Benefit Obligations) (Details) (USD $)	Sep. 30, 2014	Sep. 30, 2013
In Millions, unless otherwise specified
Fair value of plan assets	$410.50	$395.20
Pension Plans with accumulated benefit obligations in excess of plan assets	'	'
Projected benefit obligation	459.9	390.4
Accumulated benefit obligation	459.9	390.4
Fair value of plan assets	407.6	384.8
Pension plans with plan assets in excess of accumulated benefit obligations	'	'
Projected benefit obligation	1.6	9.2
Accumulated benefit obligation	1.6	9.1
Fair value of plan assets	$2.90	$10.40

Retirement_Plans_Amounts_Recog

Retirement Plans (Amounts Recognized for Pension and Other Postretirement Benefit Plans) (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012
Plan assets:	'	'	'
End of year	$410.50	$395.20	'
Pension Plan, Defined Benefit [Member]	'	'	'
Projected benefit obligations:	'	'	'
Beginning of year	399.6	448.3	'
Service cost	1.7	2	1.8
Interest cost	19.9	18.3	20.2
Actuarial loss (gain)	67.3	-42.5	'
Benefits paid	-26	-26	'
Currency translation	-0.8	-0.5	'
Decrease in obligation due to curtailment	-0.2	0	'
Other	0.1	0	0
End of year	461.5	399.6	448.3
Accumulated benefit obligation at end of year	461.5	399.5	'
Plan assets:	'	'	'
Beginning of year	395.2	387.1	'
Actual return on plan assets	42.1	34.4	'
Employer contributions	0.1	0.2	'
Currency translation	-0.9	-0.5	'
Benefits paid	-26	-26	'
End of year	410.5	395.2	387.1
Accrued benefit cost at end of year:	'	'	'
Unfunded status	-51	-4.4	'
Recognized on balance sheet:	'	'	'
Other noncurrent assets	1.3	1.3	'
Other noncurrent liabilities	-52.3	-5.7	'
Amount recognized on balance sheet	-51	-4.4	'
Recognized in accumulated other comprehensive loss, before tax:	'	'	'
Prior year service cost (gain)	0.1	0.2	'
Net actuarial loss (gain)	119.7	74.5	'
Recognized in accumulated other comprehensive loss, before tax	119.8	74.7	'
Other Plans [Member]	'	'	'
Projected benefit obligations:	'	'	'
Beginning of year	'	0.2	'
Service cost	'	0	'
Interest cost	'	0	'
Actuarial loss (gain)	'	0	'
Benefits paid	'	-0.2	'
Currency translation	'	0	'
Decrease in obligation due to curtailment	'	0	'
End of year	'	0	'
Accumulated benefit obligation at end of year	'	0	'
Plan assets:	'	'	'
Beginning of year	'	0	'
Actual return on plan assets	'	0	'
Employer contributions	'	0.2	'
Currency translation	'	0	'
Benefits paid	'	-0.2	'
End of year	'	0	'
Accrued benefit cost at end of year:	'	'	'
Unfunded status	'	0	'
Recognized on balance sheet:	'	'	'
Other noncurrent assets	'	0	'
Other noncurrent liabilities	'	0	'
Amount recognized on balance sheet	'	0	'
Recognized in accumulated other comprehensive loss, before tax:	'	'	'
Prior year service cost (gain)	'	0	'
Net actuarial loss (gain)	'	0	'
Recognized in accumulated other comprehensive loss, before tax	'	$0	'

Retirement_Plans_Pension_and_O

Retirement Plans (Pension and Other Postretirement Benefits Activity in Accumulated Other Comprehensive Income) (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]	'	'	'
Minimum pension liability, net of tax	($27.70)	$61.50	($39.40)
Pension Plan, Defined Benefit [Member]	'	'	'
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]	'	'	'
Balance at beginning of year	74.7	'	'
Actuarial gain	48.9	'	'
Defined Benefit Plan, Amortization of Gains (Losses)	-3.5	-9	-6
Minimum pension liability, net of tax	0.3	'	'
Balance at end of year	$119.80	$74.70	'

Retirement_Plans_Components_of

Retirement Plans (Components of Accumulated Other Comprehensive Income (Loss) Related to Pension and Other Postretirement Benefits) (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2015
	Pension Plan, Defined Benefit [Member]	Pension Plan, Defined Benefit [Member]	Pension Plan, Defined Benefit [Member]	Scenario, Forecast [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]	'	'	'	'
Defined Benefit Plans, Expected Future Amortization Into Net Periodic Benefit Cost in Year One	'	'	'	$3.20
Defined Benefit Plan, Amortization of Prior Service Cost (Credit)	0	0	0.6	0
Defined Benefit Plan, Amortization of Gains (Losses)	($3.50)	($9)	($6)	$3.20

Retirement_Plans_Assumptions_U

Retirement Plans (Assumptions Used) (Details)	3 Months Ended	12 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2012	Apr. 02, 2014
	Pension Plan, Defined Benefit [Member]	Pension Plan, Defined Benefit [Member]	Pension Plan, Defined Benefit [Member]	Other Plans [Member]	Other Plans [Member]
Weighted average used to determine benefit obligations:	'	'	'	'	'
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate	4.49%	5.16%	4.21%	4.22%	5.00%
Rate of compensation increases	3.50%	3.50%	3.50%	'	'
Weighted average used to determine net periodic cost:	'	'	'	'	'
Discount rate	5.16%	4.21%	5.66%	5.69%	'
Expected return on plan assets	6.24%	6.71%	6.95%	'	'
Rate of compensation increases	3.50%	3.50%	3.50%	'	'

Retirement_Plans_Effect_of_One

Retirement Plans (Effect of One-Percentage-Point Change in Assumptions) (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2014
Discount Rate [Member]	'
Effects of One-Percentage-Point Change in Assumptions [Line Items]	'
Effect on service and interest cost components, 1 percentage point increase	($0.10)
Effect on service and interest cost components, 1 percentage point decrease	0.7
Effect on benefit obligation, 1 percentage point increase	-50.3
Effect on benefit obligation, 1 percentage point decrease	61.8
Effect on 2014 expense, 1 percentage point increase	-0.5
Effect on 2014 expense, 1 percentage point decrease	0.5
Expected Return on Plan Assets [Member]	'
Effects of One-Percentage-Point Change in Assumptions [Line Items]	'
Effect on 2014 expense, 1 percentage point increase	-4
Effect on 2014 expense, 1 percentage point decrease	$4

Retirement_Plans_Strategic_All

Retirement Plans (Strategic Allocation of Plan Assets) (Details)	12 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012
Strategic asset allocation	'	'	'
Defined Benefit Plan, Target Plan Asset Allocations	100.00%	'	'
Actual asset allocations	'	'	'
Actual plan asset allocations	100.00%	100.00%	100.00%
Equity Securities [Member]	'	'	'
Strategic asset allocation	'	'	'
Defined Benefit Plan, Target Plan Asset Allocations	40.00%	'	'
Equity investments tactical range, minimum	30.00%	'	'
Equity investments tactical range, maximum	50.00%	'	'
Actual asset allocations	'	'	'
Actual plan asset allocations	40.00%	40.00%	59.00%
Large Capitalization Stocks [Member]	'	'	'
Strategic asset allocation	'	'	'
Defined Benefit Plan, Target Plan Asset Allocations	26.00%	'	'
Small Capitalization Stocks [Member]	'	'	'
Strategic asset allocation	'	'	'
Defined Benefit Plan, Target Plan Asset Allocations	5.00%	'	'
International Stocks [Member]	'	'	'
Strategic asset allocation	'	'	'
Defined Benefit Plan, Target Plan Asset Allocations	9.00%	'	'
Fixed Income Funds [Member]	'	'	'
Strategic asset allocation	'	'	'
Defined Benefit Plan, Target Plan Asset Allocations	'	60.00%	'
Equity investments tactical range, minimum	50.00%	'	'
Equity investments tactical range, maximum	70.00%	'	'
Actual asset allocations	'	'	'
Actual plan asset allocations	59.00%	59.00%	39.00%
Cash and Cash Equivalents [Member]	'	'	'
Strategic asset allocation	'	'	'
Defined Benefit Plan, Target Plan Asset Allocations	0.00%	'	'
Equity investments tactical range, minimum	0.00%	'	'
Equity investments tactical range, maximum	5.00%	'	'
Actual asset allocations	'	'	'
Actual plan asset allocations	1.00%	1.00%	2.00%

Retirement_Plans_Fair_Value_As

Retirement Plans (Fair Value Asset Allocation) (Details) (USD $)	Sep. 30, 2014	Sep. 30, 2013
In Millions, unless otherwise specified
Defined Benefit Plan Disclosure [Line Items]	'	'
Fair value of plan assets	$410.50	$395.20
Fair Value, Inputs, Level 1 [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Fair value of plan assets	50.4	52.1
Fair Value, Inputs, Level 2 [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Fair value of plan assets	360.1	343.1
Equity Securities [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Fair value of plan assets	162.5	160.9
Equity Securities [Member] | Fair Value, Inputs, Level 1 [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Fair value of plan assets	45.9	47.6
Equity Securities [Member] | Fair Value, Inputs, Level 2 [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Fair value of plan assets	116.6	113.3
Large Cap Growth Funds [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Fair value of plan assets	31.5	31.7
Large Cap Growth Funds [Member] | Fair Value, Inputs, Level 1 [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Fair value of plan assets	0	0
Large Cap Growth Funds [Member] | Fair Value, Inputs, Level 2 [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Fair value of plan assets	31.5	31.7
Large Cap Index Funds [Member] [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Fair value of plan assets	35.9	'
Large Cap Index Funds [Member] [Member] | Fair Value, Inputs, Level 1 [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Fair value of plan assets	0	'
Large Cap Index Funds [Member] [Member] | Fair Value, Inputs, Level 2 [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Fair value of plan assets	35.9	'
Large Cap Value Funds [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Fair value of plan assets	15.3	16.3
Large Cap Value Funds [Member] | Fair Value, Inputs, Level 1 [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Fair value of plan assets	0	0
Large Cap Value Funds [Member] | Fair Value, Inputs, Level 2 [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Fair value of plan assets	15.3	16.3
Large Cap Growth Mutual Funds [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Fair value of plan assets	'	16.1
Large Cap Growth Mutual Funds [Member] | Fair Value, Inputs, Level 1 [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Fair value of plan assets	'	16.1
Large Cap Growth Mutual Funds [Member] | Fair Value, Inputs, Level 2 [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Fair value of plan assets	'	0
Large Cap Value Mutual Funds [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Fair value of plan assets	'	26.1
Large Cap Value Mutual Funds [Member] | Fair Value, Inputs, Level 1 [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Fair value of plan assets	'	0
Large Cap Value Mutual Funds [Member] | Fair Value, Inputs, Level 2 [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Fair value of plan assets	'	26.1
Small Cap Growth Funds [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Fair value of plan assets	18.5	'
Small Cap Growth Funds [Member] | Fair Value, Inputs, Level 1 [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Fair value of plan assets	0	'
Small Cap Growth Funds [Member] | Fair Value, Inputs, Level 2 [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Fair value of plan assets	18.5	'
Smallcap Index Funds [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Fair value of plan assets	'	23.5
Smallcap Index Funds [Member] | Fair Value, Inputs, Level 1 [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Fair value of plan assets	'	0
Smallcap Index Funds [Member] | Fair Value, Inputs, Level 2 [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Fair value of plan assets	'	23.5
Mutual Funds [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Fair value of plan assets	45.9	31.5
Mutual Funds [Member] | Fair Value, Inputs, Level 1 [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Fair value of plan assets	45.9	31.5
Mutual Funds [Member] | Fair Value, Inputs, Level 2 [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Fair value of plan assets	0	0
International Stocks [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Fair value of plan assets	15.4	15.7
International Stocks [Member] | Fair Value, Inputs, Level 1 [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Fair value of plan assets	0	0
International Stocks [Member] | Fair Value, Inputs, Level 2 [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Fair value of plan assets	15.4	15.7
Fixed Income Funds [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Fair value of plan assets	243.5	229.8
Fixed Income Funds [Member] | Fair Value, Inputs, Level 1 [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Fair value of plan assets	0	0
Fixed Income Funds [Member] | Fair Value, Inputs, Level 2 [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Fair value of plan assets	243.5	229.8
Cash and Cash Equivalents [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Fair value of plan assets	4.5	4.5
Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 1 [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Fair value of plan assets	4.5	4.5
Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 2 [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Fair value of plan assets	$0	$0

Retirement_Plans_Expected_Bene

Retirement Plans (Expected Benefit Payments) (Details) (USD $)	Sep. 30, 2014
In Millions, unless otherwise specified
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]	'
Estimated benefit payments, CY plus 1	$27.60
Estimated benefit payments, CY plus 2	26.8
Estimated benefit payments, CY plus 3	27
Estimated benefit payments, CY plus 4	27.3
Estimated benefit payments, CY plus 5	27.5
Estimated benefit payments, CY plus 6 and up	$141

Capital_Stock_Details

Capital Stock (Details)	12 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012
Outstanding Shares [Roll Forward]	'	'	'
Shares outstanding	158,234,300	156,840,648	155,793,612
Exercised stock options	587,964	384,475	8,552
Exercise of employee stock purchase plan	204,360	290,173	339,242
Vesting of restricted stock units, net of shares withheld	734,047	719,004	699,242
Shares outstanding	159,760,671	158,234,300	156,840,648

Stockbased_Compensation_Plans_1

Stock-based Compensation Plans (Narrative) (Details) (USD $)

3 Months Ended

12 Months Ended

12 Months Ended

3 Months Ended

3 Months Ended

12 Months Ended

In Millions, except Share data, unless otherwise specified

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2012

Sep. 30, 2011

Dec. 14, 2011

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2012

Sep. 30, 2014

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Sep. 30, 2013

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Employee Stock Option [Member]

Phantom Share Units (PSUs) [Member]

Phantom Share Units (PSUs) [Member]

Phantom Share Units (PSUs) [Member]

Employee Stock [Member]

Performance Shares [Member]

Performance Shares [Member]

Performance Shares [Member]

Performance Shares [Member]

Restricted Stock Units (RSUs) [Member]

Cash-settled Performance Shares [Member]

Minimum [Member]

Maximum [Member]

Share-based Compensation Award, Tranche One [Member]

Share-based Compensation Award, Tranche One [Member]

Performance Shares [Member]

Performance Shares [Member]

Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Outstanding, Weighted Average Remaining Contractual Terms

'0 years 7 months 26 days

'

'0 years 11 months

'1 year

'1 year 7 months

'

'

'0 years 9 months 7 days

'0 years 11 months 20 days

'1 year 2 months 15 days

'

'

'

'

'

'

'

'

'

Number of shares authorized under a Plan

'

'

'

'

'

20,500,000

'

'

'

'

4,000,000

'

'

'

'

'

'

'

'

Shares available for future grants under a Plan

7,001,763

7,001,763

'

'

'

'

'

'

'

'

1,631,229

'

'

'

'

'

'

'

'

Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period

'

'10 years

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period

'

'

'

'

'

'

'3 years

'3 years

'

'

'

'

'

'

'

'3 years

'

'

'

Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period

'

381,012

509,338

1,406,318

'

'

'

304,815

382,605

358,866

'

'

'

90,841

135,553

'

243,992

'

'

Share-based Compensation, Expected Forfeiture Rate

'

2.00%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Performance Factor

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

0

2

Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Intrinsic Value, Amount Per Share

'

'

'

'

'

'

'

$8.28

'

'

'

'

'

'

'

'

$8.28

'

'

Share-based compensation liability

'

'

'

'

'

'

'

$3.40

'

'

'

'

'

'

'

'

$4

'

'

Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value

'

$8.51

$5.37

$2.19

'

'

'

$8.52

$5.22

$2.03

'

'

'

'

'

'

'

'

'

Price for shares offered under ESPP, as a percentage of closing price on the first or last day of the offering period

'

'

'

'

'

'

'

'

'

'

85.00%

'

'

'

'

'

'

'

'

Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized

$3.20

$3.20

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Weighted-average recognition period, Compensation expense related to stock awards not yet vested

'

'1 year 38 days

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount

'

1,103,845

1,387,198

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value

$5.04

$5.04

$4.30

$4.13

$6.11

'

'

$6.22

$4.03

$2.03

'

$8.52

$5.22

'

'

'

'

'

'

Stockbased_Compensation_Plans_2

Stock-based Compensation Plans (Schedule of Share-based Compensation, Effect on Statement of Operations) (Details) (USD $)	12 Months Ended
In Millions, except Share data, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	381,012	509,338	1,406,318
Decrease in operating income	$13.20	$11.40	$6
Effect on net income or loss	($8.10)	($6.90)	($3.50)
Effect on earnings or loss per basic share	($0.05)	($0.04)	($0.02)
Effect on earnings or loss per diluted share	($0.05)	($0.04)	($0.02)

Stockbased_Compensation_Plans_3

Stock-based Compensation Plans (Schedule of Share-based Compensation, Restricted Stock Units Activity) (Details) (USD $)	3 Months Ended	12 Months Ended
In Millions, except Share data, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'	'	'
RSUs, Outstanding, Number	1,206,761	1,206,761	1,925,340	2,423,762	2,065,766
Outstanding, Weighted average grant date fair value per share	$5.04	$5.04	$4.30	$4.13	$6.11
Outstanding, Weighted average remaining contractual term	'0 years 7 months 26 days	'	'0 years 11 months	'1 year	'1 year 7 months
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	'	381,012	509,338	1,406,318	'
Granted, Weighted average grant date fair value per share	'	$8.51	$5.37	$2.19	'
Vested, shares	'	-1,099,591	-995,037	-867,451	'
RSUs, Vested in Period, Weighted Average Grant Date Fair Value	'	$4.94	$4.77	$5.44	'
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value	'	$9.40	$5.60	$2.20	'
Canceled, shares	'	0	-12,723	-180,871	'
Canceled, Weighted average grant date fair value per share	'	$0	$12.28	$5.33	'

Stockbased_Compensation_Plans_4

Stock-based Compensation Plans (Schedule of Share-based Compensation. Option Activity (Details) (USD $)	12 Months Ended
In Millions, except Share data, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'	'	'
Outstanding, shares	5,124,706	5,522,610	5,625,133	'	4,552,235
Outstanding, Weighted average exercise price (per share)	$6.37	$6.22	$6.30	$6.74	'
Outstanding, Weighted average remaining contractual term, years	'5 years 0 months 11 days	'5 years 11 months	'6 years 10 months	'7 years 6 months	'
Outstanding, Aggregate intrinsic value	$13.60	$14.60	$3.50	$0	'
Granted, shares	86,904	125,780	677,117	'	'
Granted, Weighted average exercise price (per share)	$8.58	$5.91	$2.18	'	'
Exercised, shares	-587,964	-384,475	-8,552	'	'
Exercised, Weighted average exercise price (per share)	$4.61	$4.97	$3.59	'	'
Exercised, Aggregate intrinsic value	0	1.2	0	'	'
Canceled, shares	-71,411	-139,209	-771,088	'	'
Canceled, Weighted average exercise price (per share)	$12.92	$12.52	$5.97	'	'
Stock Options, Exercisable, Number	4,151,589	'	'	'	'
Exercisable, Weighted average exercise price (per share)	$6.56	'	'	'	'
Exercisable, Weighted average remaining contractual term, years	'4 years 9 months 4 days	'	'	'	'
Exercisable, Aggregate intrinsic value	12	'	'	'	'
Expected to vest in subsequent periods, shares	400,136	'	'	'	'
Expected to vest in subsequent periods, Weighted average exercise price (per share)	$4.32	'	'	'	'
Expected to vest in subsequent periods, Weighted average remaining contractual term, years	'7 years 10 months 20 days	'	'	'	'
Expected to vest in subsequent periods, Aggregate intrinsic value	$1.60	'	'	'	'

Stockbased_Compensation_Plans_5

Stock-based Compensation Plans Schedule of Share-based Compensation, Option Disclosures by Ranges of Exercise Prices (Details) (USD $)	12 Months Ended
	Sep. 30, 2014
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]	'
Stock Options, Exercise Price Range, Number of Outstanding Options	4,552,235
Stock Options, Exercise Price Range, Outstanding Options, Weighted Average Exercise Price	$6.37
Stock Options, Exercise Price Range, Outstanding Options, Weighted Average Remaining Contractual Term	'5 years 12 days
Stock Options, Exercisable, Number	4,151,589
Stock Options, Exercise Price Range, Exercisable Options, Weighted Average Exercise Price	$6.56
Exercise Price Range 1 [Member]	'
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]	'
Stock Options, Exercise Price Range, Lower Range Limit	$0
Stock Options, Exercise Price Range, Upper Range Limit	$4.99
Stock Options, Exercise Price Range, Number of Outstanding Options	1,803,311
Stock Options, Exercise Price Range, Outstanding Options, Weighted Average Exercise Price	$3.23
Stock Options, Exercise Price Range, Outstanding Options, Weighted Average Remaining Contractual Term	'6 years 4 months 24 days
Stock Options, Exercisable, Number	1,565,034
Stock Options, Exercise Price Range, Exercisable Options, Weighted Average Exercise Price	$3.37
Exercise Price Range 2 [Member]	'
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]	'
Stock Options, Exercise Price Range, Lower Range Limit	$5
Stock Options, Exercise Price Range, Upper Range Limit	$9.99
Stock Options, Exercise Price Range, Number of Outstanding Options	1,801,805
Stock Options, Exercise Price Range, Outstanding Options, Weighted Average Exercise Price	$5.85
Stock Options, Exercise Price Range, Outstanding Options, Weighted Average Remaining Contractual Term	'5 years 15 days
Stock Options, Exercisable, Number	1,639,436
Stock Options, Exercise Price Range, Exercisable Options, Weighted Average Exercise Price	$5.70
Exercise Price Range 3 [Member]	'
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]	'
Stock Options, Exercise Price Range, Lower Range Limit	$10
Stock Options, Exercise Price Range, Upper Range Limit	$14.99
Stock Options, Exercise Price Range, Number of Outstanding Options	656,276
Stock Options, Exercise Price Range, Outstanding Options, Weighted Average Exercise Price	$11.84
Stock Options, Exercise Price Range, Outstanding Options, Weighted Average Remaining Contractual Term	'2 years 8 months 7 days
Stock Options, Exercisable, Number	656,276
Stock Options, Exercise Price Range, Exercisable Options, Weighted Average Exercise Price	$11.84
Exercise Price Range 4 [Domain]	'
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]	'
Stock Options, Exercise Price Range, Lower Range Limit	$15
Stock Options, Exercise Price Range, Upper Range Limit	$20.99
Stock Options, Exercise Price Range, Number of Outstanding Options	290,843
Stock Options, Exercise Price Range, Outstanding Options, Weighted Average Exercise Price	$16.71
Stock Options, Exercise Price Range, Outstanding Options, Weighted Average Remaining Contractual Term	'1 year 9 months 27 days
Stock Options, Exercisable, Number	290,843
Stock Options, Exercise Price Range, Exercisable Options, Weighted Average Exercise Price	$16.71

Stockbased_Compensation_Plans_6

Stock-based Compensation Plans (Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions) (Details) (USD $)	12 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	381,012	509,338	1,406,318
Employee Stock Option [Member]	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	'3 years	'	'
Grant-date fair value, in dollars per share	5.13	5.91	1.31
Risk-free interest rate	2.44%	1.63%	1.74%
Dividend yield	1.10%	2.17%	1.97%
Expected life (years)	'8 years	'8 years	'8 years
Expected annual volatility	63.86%	66.96%	73.42%

Stockbased_Compensation_Plans_7

Stock-based Compensation Plans (Schedule of Share-based Compensation, Phantom Award Activity) (Details) (USD $)	3 Months Ended	12 Months Ended
In Millions, except Share data, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'	'	'
Outstanding, Weighted average grant date fair value per share	$5.04	$5.04	$4.30	$4.13	$6.11
Outstanding, Weighted average remaining contractual term	'0 years 7 months 26 days	'	'0 years 11 months	'1 year	'1 year 7 months
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	'	381,012	509,338	1,406,318	'
Granted, Weighted average grant date fair value per share	'	$8.51	$5.37	$2.19	'
Vested, shares	'	-1,099,591	-995,037	-867,451	'
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value	'	$9.40	$5.60	$2.20	'
Canceled, shares	'	0	-12,723	-180,871	'
Canceled, Weighted average grant date fair value per share	'	$0	$12.28	$5.33	'
Phantom Share Units (PSUs) [Member]	'	'	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'	'	'
Outstanding, shares	'	608,982	358,866	'	'
Outstanding, Weighted average grant date fair value per share	$6.22	$6.22	$4.03	$2.03	'
Outstanding, Weighted average remaining contractual term	'	'0 years 9 months 7 days	'0 years 11 months 20 days	'1 year 2 months 15 days	'
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	'	304,815	382,605	358,866	'
Granted, Weighted average grant date fair value per share	'	$8.52	$5.22	$2.03	'
Vested, shares	'	-240,739	-119,637	'	'
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value	'	$2.10	$0.70	$0	'
Canceled, shares	'	-29,770	-12,852	'	'
Canceled, Weighted average grant date fair value per share	'	$5.29	$2.03	'	'
Outstanding, shares	643,288	643,288	608,982	358,866	'

Stockbased_Compensation_Plans_8

Stock-based Compensation Plans Schedule of shared-based compensation, performance units (Details)

12 Months Ended

3 Months Ended

12 Months Ended

3 Months Ended

12 Months Ended

3 Months Ended

12 Months Ended

3 Months Ended

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2013

Dec. 31, 2014

Sep. 30, 2016

Dec. 31, 2014

Performance Shares [Member]

Performance Shares [Member]

Performance Shares [Member]

Performance Shares [Member]

Performance Shares [Member]

Performance Shares [Member]

Performance Shares [Member]

Scenario, Forecast [Member]

Scenario, Forecast [Member]

Scenario, Forecast [Member]

Share-based Compensation Award, Tranche Three [Member]

Share-based Compensation Award, Tranche Three [Member]

Share-based Compensation Award, Tranche Two [Member]

Share-based Compensation Award, Tranche Two [Member]

Share-based Compensation Award, Tranche Two [Member]

Share-based Compensation Award, Tranche One [Member]

Share-based Compensation Award, Tranche One [Member]

Performance Shares [Member]

Performance Shares [Member]

Performance Shares [Member]

Share-based Compensation Award, Tranche Three [Member]

Share-based Compensation Award, Tranche Three [Member]

Share-based Compensation Award, Tranche Two [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period

381,012

509,338

1,406,318

90,849

135,552

90,841

135,553

'

90,841

135,553

'

'

'

Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period

1,099,591

995,037

867,451

'

'

'

'

271,106

181,682

271,106

0

0

0

Supplemental_Balance_Sheet_Inf2

Supplemental Balance Sheet Information (Schedule Of Selected Supplemental Balance Sheet Information) (Details) (USD $)	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011
In Millions, unless otherwise specified
Inventories:	'	'	'	'
Purchased components and raw material	$72	$75.40	'	'
Work in process	34.5	38.6	'	'
Finished goods	91.5	94.5	'	'
Inventories, net	198	208.5	'	'
Other current assets:	'	'	'	'
Maintenance and repair tooling	22.6	22.5	'	'
Prepaid income taxes	13	14.9	'	'
U.S. Pipe-related workers' compensation and other reimbursements	1.6	2.2	'	'
Other	6.9	6.5	'	'
Other current assets	44.1	46.1	'	'
Property, plant and equipment:	'	'	'	'
Land	9.6	10.6	'	'
Buildings	78	75.5	'	'
Machinery and equipment	332.9	305.7	'	'
Construction in progress	18.7	19.6	'	'
Property, plant and equipment, gross	439.2	411.4	'	'
Accumulated depreciation	-292.9	-269.5	'	'
Property, plant and equipment net	146.3	141.9	'	'
Other current liabilities:	'	'	'	'
Compensation and benefits	39.5	37.3	'	'
Customer rebates	16.9	15.5	'	'
Interest	10.7	12	'	'
Taxes other than income taxes	4.7	5	'	'
Warranty	2.6	2.8	1.6	2
Income taxes	0.7	1.3	'	'
Restructuring	0.9	0	'	'
Environmental	0.1	0.2	'	'
Other	6.1	6.5	'	'
Other current liabilities	$82.20	$80.60	'	'

Supplemental_Statement_of_Oper2

Supplemental Statement of Operations Information (Details) (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012
Included in selling, general and administrative expenses:	'	'	'
Research and development	$14.40	$14.80	$12.70
Advertising	4.7	5	4.9
Interest expense, net:	'	'	'
Deferred financing fees amortization	2	2	2.3
Interest rate swap contracts	0	0	5
Other interest expense	0.2	0.7	-0.6
Interest Expense	50	52	60.2
Interest income	-0.4	-0.3	-0.3
Interest expense, net	49.6	51.7	59.9
Seven Point Three Seven Five Senior Subordinated Notes [Member]	'	'	'
Interest expense, net:	'	'	'
Debt instrument interest expense	30.6	31	31
Eight Point Seven Five Senior Unsecured Notes [Member]	'	'	'
Interest expense, net:	'	'	'
Debt instrument interest expense	16	16.8	19.3
ABL Agreement [Member]	'	'	'
Interest expense, net:	'	'	'
Debt instrument interest expense	$1.20	$1.50	$3.20

Accumulated_Other_Comprehensiv1

Accumulated Other Comprehensive Loss (Schedule Of Accumulated Other Comprehensive Loss) (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items]	'
Accumulated Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net of Tax	($63.10)
Accumulated Other Comprehensive Income (Loss), Net of Tax	-60.7
Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax	-2.4
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	-32.1
Accumulated Other Comprehensive Income (Loss), Net of Tax	-28.6
Accumulated Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net of Tax	-35.4
Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax	-6.8
Accumulated Translation Adjustment [Member]	'
Accumulated Other Comprehensive Income (Loss) [Line Items]	'
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	-4.4
Accumulated Defined Benefit Plans Adjustment [Member]	'
Accumulated Other Comprehensive Income (Loss) [Line Items]	'
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	$27.70

Supplemental_Cash_Flow_Informa2

Supplemental Cash Flow Information (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012
Supplemental Cash Flow Information [Abstract]	'	'	'
Decrease in other noncurrent assets	$0	$0.30	($0.10)
Decrease (increase) in other noncurrent liabilities	-25.5	51.5	-36.2
Decrease (increase) in other current liabilities	0.1	0	0.3
Increase (Decrease) in Deferred Income Taxes	9.8	-20.1	-0.6
Decrease (increase) in accumulated other comprehensive loss	15.6	-31.7	36.6
Increase (Decrease) in Other Operating Assets and Liabilities, Net	0	0	0
Cash paid (received), net:	'	'	'
Interest	48.7	49.1	53.3
Income taxes	$2.60	$0.70	($6.90)

Segment_Information_Revenue_an

Segment Information (Revenue and Long-Lived Assets by Geographical Areas) (Details) (USD $)	3 Months Ended								12 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012
Revenues from External Customers and Long-Lived Assets [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Net sales	$320.70	$318.50	$288.10	$257.40	$293.20	$299.40	$283.10	$245.10	$1,184.70	$1,120.80	$1,023.90
Property, plant and equipment, net	146.3	'	'	'	141.9	'	'	'	146.3	141.9	'
United States	'	'	'	'	'	'	'	'	'	'	'
Revenues from External Customers and Long-Lived Assets [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Net sales	'	'	'	'	'	'	'	'	1,040.70	971	872.3
Property, plant and equipment, net	138.5	'	'	'	133.6	'	'	'	138.5	133.6	'
Canada	'	'	'	'	'	'	'	'	'	'	'
Revenues from External Customers and Long-Lived Assets [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Net sales	'	'	'	'	'	'	'	'	101	101.5	112.4
Property, plant and equipment, net	4.3	'	'	'	4.7	'	'	'	4.3	4.7	'
Other	'	'	'	'	'	'	'	'	'	'	'
Revenues from External Customers and Long-Lived Assets [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Net sales	'	'	'	'	'	'	'	'	43	48.3	39.2
Property, plant and equipment, net	$3.50	'	'	'	$3.60	'	'	'	$3.50	$3.60	'

Segment_Information_Narrative_

Segment Information (Narrative) (Details) (USD $)

12 Months Ended

12 Months Ended

12 Months Ended

In Millions, unless otherwise specified

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2012

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2011

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2013

business_segments

Customer Concentration Risk [Member]

Customer Concentration Risk [Member]

Customer Concentration Risk [Member]

Customer Concentration Risk [Member]

Customer Concentration Risk [Member]

Customer Concentration Risk [Member]

Customer Concentration Risk [Member]

Customer Concentration Risk [Member]

Customer Concentration Risk [Member]

Customer Concentration Risk [Member]

Customer Concentration Risk [Member]

Customer Concentration Risk [Member]

Customer Concentration Risk [Member]

Customer Concentration Risk [Member]

Customer Concentration Risk [Member]

Customer Concentration Risk [Member]

Customer Concentration Risk [Member]

Customer Concentration Risk [Member]

Major Customers, Group One

Major Customers, Group One

Major Customers, Group Two

Major Customers, Group Two

Ferguson Enterprises

Ferguson Enterprises

Ferguson Enterprises

Ferguson Enterprises

Ferguson Enterprises

Ferguson Enterprises

Ferguson Enterprises

HD Supply

HD Supply

HD Supply

HD Supply

HD Supply

HD Supply

HD Supply

customer

Sales Revenue, Goods, Gross [Member]

customer

Sales Revenue, Goods, Gross [Member]

Sales Revenue, Goods, Gross [Member]

Sales Revenue, Goods, Gross [Member]

Sales Revenue, Goods, Gross [Member]

Sales Revenue, Goods, Gross [Member]

Sales Revenue, Goods, Gross [Member]

Accounts Receivable [Member]

Accounts Receivable [Member]

Sales Revenue, Goods, Gross [Member]

Sales Revenue, Goods, Gross [Member]

Sales Revenue, Goods, Gross [Member]

Sales Revenue, Goods, Gross [Member]

Sales Revenue, Goods, Gross [Member]

Accounts Receivable [Member]

Accounts Receivable [Member]

Mueller Co. [Member]

Anvil [Member]

Mueller Co. [Member]

Anvil [Member]

Segment Reporting [Abstract]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Number of Reportable Segments

2

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Revenue, Major Customer [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Concentration risk, percentage of benchmark

'

'

'

39.00%

'

24.00%

13.00%

12.00%

12.00%

16.00%

8.00%

'

'

11.00%

11.00%

10.00%

15.00%

4.00%

'

'

Number of major customers

'

'

10

'

2

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Receivables, net

$182.10

$164.50

'

'

'

'

'

'

'

'

'

$25.70

$22.90

'

'

'

'

'

$17.70

$24.40

Segment_Information_Schedule_O

Segment Information (Schedule Of Selected Supplemental Balance Sheet Information) (Details) (USD $)	3 Months Ended								12 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012
Segment Reporting Information [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Net sales, excluding intercompany	$320.70	$318.50	$288.10	$257.40	$293.20	$299.40	$283.10	$245.10	$1,184.70	$1,120.80	$1,023.90
Operating income	43	41.8	25.3	14	33.2	32.9	24.3	6.9	124.1	97.3	64.1
Depreciation and amortization	'	'	'	'	'	'	'	'	56.7	59.2	60.6
Restructuring	'	'	'	'	'	'	'	'	3.1	1.5	2.8
Capital expenditures	'	'	'	'	'	'	'	'	-36.9	-36.5	-31.4
Total assets	1,317.10	'	'	'	1,281.90	'	'	'	1,317.10	1,281.90	'
Total intangible assets net book value	533.6	'	'	'	553.1	'	'	'	533.6	553.1	'
Mueller Co. [Member]	'	'	'	'	'	'	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Net sales, excluding intercompany	'	'	'	'	'	'	'	'	783.3	729.5	652.4
Operating income	'	'	'	'	'	'	'	'	122.3	91.3	57.7
Depreciation and amortization	'	'	'	'	'	'	'	'	42.1	44.6	45.7
Restructuring	'	'	'	'	'	'	'	'	2.2	1.5	2.5
Capital expenditures	'	'	'	'	'	'	'	'	-24.9	-24	-20
Total assets	835.8	'	'	'	846.8	'	'	'	835.8	846.8	'
Total intangible assets net book value	475.7	'	'	'	491.6	'	'	'	475.7	491.6	'
Anvil [Member]	'	'	'	'	'	'	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Net sales, excluding intercompany	'	'	'	'	'	'	'	'	401.4	391.3	371.5
Operating income	'	'	'	'	'	'	'	'	41.3	40.2	37.3
Depreciation and amortization	'	'	'	'	'	'	'	'	14.2	14.2	14.3
Restructuring	'	'	'	'	'	'	'	'	0.9	0.1	0.3
Capital expenditures	'	'	'	'	'	'	'	'	-11.6	-12.3	-11.4
Total assets	263.9	'	'	'	259.6	'	'	'	263.9	259.6	'
Total intangible assets net book value	57.9	'	'	'	61.5	'	'	'	57.9	61.5	'
Corporate [Member]	'	'	'	'	'	'	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Net sales, excluding intercompany	'	'	'	'	'	'	'	'	0	0	0
Operating income	'	'	'	'	'	'	'	'	-39.5	-34.2	-30.9
Depreciation and amortization	'	'	'	'	'	'	'	'	0.4	0.4	0.6
Restructuring	'	'	'	'	'	'	'	'	0	-0.1	0
Capital expenditures	'	'	'	'	'	'	'	'	-0.4	-0.2	0
Total assets	217.4	'	'	'	175.5	'	'	'	217.4	175.5	'
Total intangible assets net book value	0	'	'	'	0	'	'	'	0	0	'
Intersegment Eliminations [Member]	'	'	'	'	'	'	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Intercompany sales	'	'	'	'	'	'	'	'	6.8	7.5	7.4
Intersegment Eliminations [Member] | Mueller Co. [Member]	'	'	'	'	'	'	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Intercompany sales	'	'	'	'	'	'	'	'	6.7	7.4	7.3
Intersegment Eliminations [Member] | Anvil [Member]	'	'	'	'	'	'	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Intercompany sales	'	'	'	'	'	'	'	'	0.1	0.1	0.1
Intersegment Eliminations [Member] | Corporate [Member]	'	'	'	'	'	'	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Intercompany sales	'	'	'	'	'	'	'	'	$0	$0	$0

Commitments_and_Contingencies_

Commitments and Contingencies (Details)	12 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2014	Sep. 30, 2014
	USD ($)	CAD	USD ($)	USD ($)	Prior To 1995 [member]	From 2000 to 2005 [Member]
					USD ($)	USD ($)
Loss Contingency, Damages Sought, Value	'	10	'	'	'	'
Damages arising due to alleged environmental contamination of the property and breach of lease	'	10	'	'	'	'
Walter Energy tax assessment	'	'	'	'	34	82.2
Walter Energy tax assessment prior to 1995 related to timing	21	'	'	'	'	'
Amount payable pending completion of an IRS audit	11.6	'	'	'	'	'
Multiemployer Plans, Withdrawal Obligation	0.9	'	'	'	'	'
Gain (Loss) on Sale of Assets and Asset Impairment Charges	2.5	'	'	'	'	'
Operating Leases	'	'	'	'	'	'
Rent expense	9.3	'	8.4	8.4	'	'
Future minimum payment under non-cancelable operating leases, CY Plus 1	7.1	'	'	'	'	'
Future minimum payment under non-cancelable operating leases, CY Plus 2	5.8	'	'	'	'	'
Future minimum payment under non-cancelable operating leases, CY Plus 3	4.5	'	'	'	'	'
Future minimum payment under non-cancelable operating leases, CY Plus 4	2.8	'	'	'	'	'
Future minimum payment under non-cancelable operating leases, CY Plus 5	2	'	'	'	'	'
Future minimum payment under non-cancelable operating leases, CY plus 6 and up	$2.50	'	'	'	'	'

Subsequent_Events_Details

Subsequent Events (Details) (USD $)	12 Months Ended			3 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2014
				Subsequent Event [Member]
Subsequent Event [Line Items]	'	'	'	'
Dividends Payable, Date Declared	'	'	'	22-Oct-14
Dividends declared, in dollars per share	$0.07	$0.07	$0.07	$0.02
Dividends Payable, Date to be Paid	'	'	'	20-Nov-14
Dividends Payable, Date of Record	'	'	'	10-Nov-14

Quarterly_Consolidated_Financi2

Quarterly Consolidated Financial Information (Unaudited) (Details) (USD $)	3 Months Ended								12 Months Ended
In Millions, except Per Share data, unless otherwise specified	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012
Quarterly Financial Information Disclosure [Abstract]	'	'	'	'	'	'	'	'	'	'	'
Net sales	$320.70	$318.50	$288.10	$257.40	$293.20	$299.40	$283.10	$245.10	$1,184.70	$1,120.80	$1,023.90
Gross profit	101.3	97.3	82.2	67.1	88.8	90	77.3	57.1	347.9	313.2	271.1
Operating income	43	41.8	25.3	14	33.2	32.9	24.3	6.9	124.1	97.3	64.1
Income (loss) from continuing operations	'	'	'	'	16.8	16	7.6	-5	55.5	35.4	-5.2
Income (loss) from discontinued operations, net of tax	'	'	'	'	-3.3	-1.9	-1.4	12	0	5.4	-103.2
Net Income (Loss) Attributable to Parent	$26.20	$18.50	$9.70	$1.10	$13.50	$14.10	$6.20	$7	$55.50	$40.80	($108.40)
Net income (loss) per basic share:	'	'	'	'	'	'	'	'	'	'	'
Continuing operations, in dollars per share	'	'	'	'	$0.11	$0.10	$0.05	($0.03)	$0.35	$0.23	($0.03)
Discontinued operations, in dollars per share	'	'	'	'	($0.02)	($0.01)	($0.01)	$0.07	$0	$0.03	($0.66)
Net income (loss) per basic share	$0.16	$0.12	$0.06	$0.01	$0.09	$0.09	$0.04	$0.04	$0.35	$0.26	($0.69)
Net income (loss) per diluted share:	'	'	'	'	'	'	'	'	'	'	'
Continuing operations, in dollars per share	'	'	'	'	$0.10	$0.10	$0.05	($0.03)	$0.34	$0.22	($0.03)
Discontinued operations, in dollars per share	'	'	'	'	($0.02)	($0.01)	($0.01)	$0.07	$0	$0.03	($0.66)
Net income (loss) per diluted share	$0.16	$0.11	$0.06	$0.01	$0.08	$0.09	$0.04	$0.04	$0.34	$0.25	($0.69)

Consolidating_Guarantor_and_No2

Consolidating Guarantor and Non-Guarantor Financial Information (Schedule Of Guarantor Companies) (Details)	12 Months Ended
	Sep. 30, 2014
Anvil International Holdings, LLC [Member]	'
Entity Incorporation, State Country Name	'Delaware
Echologics, LLC [Member]	'
Entity Incorporation, State Country Name	'Delaware
Henry Pratt Company, LLC [Member]	'
Entity Incorporation, State Country Name	'Delaware
Henry Pratt International, LLC [Member]	'
Entity Incorporation, State Country Name	'Delaware
Hydro Gate, LLC [Member]	'
Entity Incorporation, State Country Name	'Delaware
J.B. Smith Mfg. Co., LLC [Member]	'
Entity Incorporation, State Country Name	'Delaware
James Jones Company, LLC [Member]	'
Entity Incorporation, State Country Name	'Delaware
Milliken Valve, LLC [Member]	'
Entity Incorporation, State Country Name	'Delaware
Mueller Co. LLC [Member]	'
Entity Incorporation, State Country Name	'Delaware
Mueller Group, LLC [Member]	'
Entity Incorporation, State Country Name	'Delaware
Mueller Group Co-Issuer, Inc. [Member]	'
Entity Incorporation, State Country Name	'Delaware
Mueller International, L.L.C. [Member]	'
Entity Incorporation, State Country Name	'Delaware
Mueller Property Holdings, LLC [Member]	'
Entity Incorporation, State Country Name	'Delaware
Mueller Co. International Holdings, LLC [Member]	'
Entity Incorporation, State Country Name	'Delaware
Mueller Service California, Inc. [Member]	'
Entity Incorporation, State Country Name	'Delaware
Mueller Service Co., LLC [Member]	'
Entity Incorporation, State Country Name	'Delaware
Mueller Systems, LLC [Member]	'
Entity Incorporation, State Country Name	'Delaware
OSP, LLC [Member]	'
Entity Incorporation, State Country Name	'Delaware
US Pipe Valve & Hydrant LLC [Member]	'
Entity Incorporation, State Country Name	'Delaware

Consolidating_Guarantor_and_No3

Consolidating Guarantor and Non-Guarantor Financial Information (Schedule Of Consolidating Balance Sheet) (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2014		Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011
Consolidating Guarantor and Non-Guarantor Financial Information [Text Block]	'		'	'	'
	The following information is included as a result of the guarantee by certain of our 100% owned U.S. subsidiaries (“Guarantor Companies”) of the Senior Unsecured Notes and the Senior Subordinated Notes. None of our other subsidiaries or our industrial valve joint venture guarantee the Senior Unsecured Notes and the Senior Subordinated Notes. Each of the guarantees is joint and several and full and unconditional. Guarantor Companies are listed below.
	Name	State of
		incorporation
		or organization
	Anvil International, LLC	Delaware
	Echologics, LLC	Delaware
	Henry Pratt Company, LLC	Delaware
	Henry Pratt International, LLC	Delaware
	Hydro Gate, LLC	Delaware
	J.B. Smith Mfg. Co., LLC	Delaware
	James Jones Company, LLC	Delaware
	Milliken Valve, LLC	Delaware
	Mueller Co. LLC	Delaware
	Mueller Group, LLC	Delaware
	Mueller Group Co-Issuer, Inc.	Delaware
	Mueller International, L.L.C.	Delaware
	Mueller Property Holdings, LLC	Delaware
	Mueller Co. International Holdings, LLC	Delaware
	Mueller Service California, Inc.	Delaware
	Mueller Service Co., LLC	Delaware
	Mueller Systems, LLC	Delaware
	OSP, LLC	Delaware
	U.S. Pipe Valve & Hydrant, LLC	Delaware
Assets:	'		'	'	'
Cash and cash equivalents	$161.10		$123.60	$83	$61
Receivables, net	182.1		164.5	'	'
Inventories	198		208.5	'	'
Deferred income taxes	38.6		26.7	'	'
Other current assets	44.1		46.1	'	'
Total current assets	623.9		569.4	'	'
Intercompany debits	'		0	'	'
Property, plant and equipment	146.3		141.9	'	'
Identifiable intangible assets	533.6		553.1	'	'
Other noncurrent assets	13.3		17.5	'	'
Equity Method Investment, Aggregate Cost	0		0	'	'
Total assets	1,317.10		1,281.90	'	'
Liabilities and equity:	'		'	'	'
Accounts payable	116		101.2	'	'
Other current liabilities	82.2		80.6	'	'
Total current liabilities	244.4		183.1	'	'
Long-term debt	499.4		599.5	'	'
Deferred income taxes	150.4		141.5	'	'
Other noncurrent liabilities	71.3		29.6	'	'
Intercompany accounts	0		0	'	'
Total liabilities	965.5		953.7	'	'
Equity	351.6		328.2	231.2	379
Total liabilities and equity	1,317.10		1,281.90	'	'
Current portion of long-term debt	46.2		1.3	'	'
Issuer [Member]	'		'	'	'
Assets:	'		'	'	'
Cash and cash equivalents	125.5		86.6	53.3	36.2
Receivables, net	0.1		0.1	'	'
Inventories	0		0	'	'
Deferred income taxes	38		26.3	'	'
Other current assets	16.5		18.2	'	'
Total current assets	180.1		131.2	'	'
Intercompany debits	882.7		882.7	'	'
Property, plant and equipment	1.5		1.5	'	'
Identifiable intangible assets	0		0	'	'
Other noncurrent assets	11.7		16	'	'
Equity Method Investment, Aggregate Cost	263.2		155.2	'	'
Total assets	1,339.20		1,186.60	'	'
Liabilities and equity:	'		'	'	'
Accounts payable	4.5		4.6	'	'
Other current liabilities	29.9		29.7	'	'
Total current liabilities	79.4		34.3	'	'
Long-term debt	498.3		598	'	'
Deferred income taxes	149.9		140.9	'	'
Other noncurrent liabilities	63.8		21.3	'	'
Intercompany accounts	-196.2		-63.9	'	'
Total liabilities	987.6		858.4	'	'
Equity	351.6		328.2	'	'
Total liabilities and equity	1,339.20		1,186.60	'	'
Current portion of long-term debt	45		0	'	'
Guarantor Companies [Member]	'		'	'	'
Assets:	'		'	'	'
Cash and cash equivalents	-2.1		-2.3	-3.7	-3.8
Receivables, net	166.4		150.4	'	'
Inventories	187.4		195.3	'	'
Deferred income taxes	0		0	'	'
Other current assets	26		25.7	'	'
Total current assets	377.7		369.1	'	'
Intercompany debits	'		0	'	'
Property, plant and equipment	137		132	'	'
Identifiable intangible assets	531.6		551.3	'	'
Other noncurrent assets	0.3		0.2	'	'
Equity Method Investment, Aggregate Cost	41.3		39.2	'	'
Total assets	1,087.90		1,091.80	'	'
Liabilities and equity:	'		'	'	'
Accounts payable	105		90	'	'
Other current liabilities	48.9		46.6	'	'
Total current liabilities	155.1		137.9	'	'
Long-term debt	1.1		1.5	'	'
Deferred income taxes	0		0	'	'
Other noncurrent liabilities	6.5		7.5	'	'
Intercompany accounts	-662		-789.7	'	'
Total liabilities	824.7		936.6	'	'
Equity	263.2		155.2	'	'
Total liabilities and equity	1,087.90		1,091.80	'	'
Current portion of long-term debt	1.2		1.3	'	'
Non-Guarantor Companies [Member]	'		'	'	'
Assets:	'		'	'	'
Cash and cash equivalents	37.7		39.3	33.4	28.6
Receivables, net	15.6		14	'	'
Inventories	10.6		13.2	'	'
Deferred income taxes	0.6		0.4	'	'
Other current assets	1.6		2.2	'	'
Total current assets	66.1		69.1	'	'
Intercompany debits	'		0	'	'
Property, plant and equipment	7.8		8.4	'	'
Identifiable intangible assets	2		1.8	'	'
Other noncurrent assets	1.3		1.3	'	'
Equity Method Investment, Aggregate Cost	0		0	'	'
Total assets	77.2		80.6	'	'
Liabilities and equity:	'		'	'	'
Accounts payable	6.5		6.6	'	'
Other current liabilities	3.4		4.3	'	'
Total current liabilities	9.9		10.9	'	'
Long-term debt	0		0	'	'
Deferred income taxes	0.5		0.6	'	'
Other noncurrent liabilities	1		0.8	'	'
Intercompany accounts	-24.5		-29.1	'	'
Total liabilities	35.9		41.4	'	'
Equity	41.3		39.2	'	'
Total liabilities and equity	77.2		80.6	'	'
Current portion of long-term debt	0		0	'	'
Consolidation, Eliminations [Member]	'		'	'	'
Assets:	'		'	'	'
Cash and cash equivalents	0		0	0	0
Receivables, net	0		0	'	'
Inventories	0		0	'	'
Deferred income taxes	0		0	'	'
Other current assets	0		0	'	'
Total current assets	0		0	'	'
Intercompany debits	-882.7		-882.7	'	'
Property, plant and equipment	0		0	'	'
Identifiable intangible assets	0		0	'	'
Other noncurrent assets	0		0	'	'
Equity Method Investment, Aggregate Cost	-304.5		-194.4	'	'
Total assets	-1,187.20		-1,077.10	'	'
Liabilities and equity:	'		'	'	'
Accounts payable	0		0	'	'
Other current liabilities	0		0	'	'
Total current liabilities	0		0	'	'
Long-term debt	0		0	'	'
Deferred income taxes	0		0	'	'
Other noncurrent liabilities	0		0	'	'
Intercompany accounts	882.7		882.7	'	'
Total liabilities	-882.7		-882.7	'	'
Equity	-304.5		-194.4	'	'
Total liabilities and equity	-1,187.20		-1,077.10	'	'
Current portion of long-term debt	$0		$0	'	'

Consolidating_Guarantor_and_No4

Consolidating Guarantor and Non-Guarantor Financial Information (Schedule Of Consolidating Statement Of Operations) (Details) (USD $)	3 Months Ended								12 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012
Other Comprehensive Income (Loss), Net of Tax	'	'	'	'	'	'	'	'	($32.10)	$59.10	($33.50)
Net sales	320.7	318.5	288.1	257.4	293.2	299.4	283.1	245.1	1,184.70	1,120.80	1,023.90
Cost of sales	'	'	'	'	'	'	'	'	836.8	807.6	752.8
Gross profit	101.3	97.3	82.2	67.1	88.8	90	77.3	57.1	347.9	313.2	271.1
Operating expenses:	'	'	'	'	'	'	'	'	'	'	'
Selling, general and administrative	'	'	'	'	'	'	'	'	220.7	214.4	204.2
Restructuring	'	'	'	'	'	'	'	'	3.1	1.5	2.8
Total operating expenses	'	'	'	'	'	'	'	'	223.8	215.9	207
Operating income	43	41.8	25.3	14	33.2	32.9	24.3	6.9	124.1	97.3	64.1
Interest expense, net	'	'	'	'	'	'	'	'	49.6	51.7	59.9
Loss on early extinguishment of debt	'	'	'	'	'	'	'	'	1	1.4	1.5
Income (loss) before income taxes	'	'	'	'	'	'	'	'	73.5	44.2	2.7
Income tax expense (benefit)	'	'	'	'	'	'	'	'	-18	-8.8	-7.9
Equity in income (loss) of subsidiaries	'	'	'	'	'	'	'	'	0	0	0
Income (loss) from continuing operations	'	'	'	'	16.8	16	7.6	-5	55.5	35.4	-5.2
Income (loss) from discontinued operations, net of tax	'	'	'	'	'	'	'	'	0	5.4	-103.2
Net Income (Loss) Attributable to Parent	26.2	18.5	9.7	1.1	13.5	14.1	6.2	7	55.5	40.8	-108.4
Issuer [Member]	'	'	'	'	'	'	'	'	'	'	'
Other Comprehensive Income (Loss), Net of Tax	'	'	'	'	'	'	'	'	-32.1	59.1	-33.5
Net sales	'	'	'	'	'	'	'	'	0	0	0
Cost of sales	'	'	'	'	'	'	'	'	0	0	0
Gross profit	'	'	'	'	'	'	'	'	0	0	0
Operating expenses:	'	'	'	'	'	'	'	'	'	'	'
Selling, general and administrative	'	'	'	'	'	'	'	'	39.1	34	30.6
Restructuring	'	'	'	'	'	'	'	'	0	0	0
Total operating expenses	'	'	'	'	'	'	'	'	39.1	34	30.6
Operating income	'	'	'	'	'	'	'	'	-39.1	-34	-30.6
Interest expense, net	'	'	'	'	'	'	'	'	49.7	51.6	60
Loss on early extinguishment of debt	'	'	'	'	'	'	'	'	1	1.4	1.5
Income (loss) before income taxes	'	'	'	'	'	'	'	'	-89.8	-87	-92.1
Income tax expense (benefit)	'	'	'	'	'	'	'	'	41.9	17.3	28.3
Equity in income (loss) of subsidiaries	'	'	'	'	'	'	'	'	103.4	105.1	58.6
Income (loss) from continuing operations	'	'	'	'	'	'	'	'	'	35.4	-5.2
Income (loss) from discontinued operations, net of tax	'	'	'	'	'	'	'	'	'	5.4	-103.2
Net Income (Loss) Attributable to Parent	'	'	'	'	'	'	'	'	55.5	40.8	-108.4
Guarantor Companies [Member]	'	'	'	'	'	'	'	'	'	'	'
Other Comprehensive Income (Loss), Net of Tax	'	'	'	'	'	'	'	'	-4.4	-2.4	2.9
Net sales	'	'	'	'	'	'	'	'	1,072.40	1,005.90	907
Cost of sales	'	'	'	'	'	'	'	'	739.3	708.6	652.1
Gross profit	'	'	'	'	'	'	'	'	333.1	297.3	254.9
Operating expenses:	'	'	'	'	'	'	'	'	'	'	'
Selling, general and administrative	'	'	'	'	'	'	'	'	171.2	168.2	160.2
Restructuring	'	'	'	'	'	'	'	'	0.6	1.4	2.7
Total operating expenses	'	'	'	'	'	'	'	'	171.8	169.6	162.9
Operating income	'	'	'	'	'	'	'	'	161.3	127.7	92
Interest expense, net	'	'	'	'	'	'	'	'	0.2	0.3	0.2
Loss on early extinguishment of debt	'	'	'	'	'	'	'	'	0	0	0
Income (loss) before income taxes	'	'	'	'	'	'	'	'	161.1	127.4	91.8
Income tax expense (benefit)	'	'	'	'	'	'	'	'	-59.4	-25.5	-35.6
Equity in income (loss) of subsidiaries	'	'	'	'	'	'	'	'	1.7	3.2	2.4
Income (loss) from continuing operations	'	'	'	'	'	'	'	'	'	105.1	58.6
Income (loss) from discontinued operations, net of tax	'	'	'	'	'	'	'	'	'	0	0
Net Income (Loss) Attributable to Parent	'	'	'	'	'	'	'	'	103.4	105.1	58.6
Non-Guarantor Companies [Member]	'	'	'	'	'	'	'	'	'	'	'
Other Comprehensive Income (Loss), Net of Tax	'	'	'	'	'	'	'	'	-4.4	-2.4	2.9
Net sales	'	'	'	'	'	'	'	'	112.3	114.9	116.9
Cost of sales	'	'	'	'	'	'	'	'	97.5	99	100.7
Gross profit	'	'	'	'	'	'	'	'	14.8	15.9	16.2
Operating expenses:	'	'	'	'	'	'	'	'	'	'	'
Selling, general and administrative	'	'	'	'	'	'	'	'	10.4	12.2	13.4
Restructuring	'	'	'	'	'	'	'	'	2.5	0.1	0.1
Total operating expenses	'	'	'	'	'	'	'	'	12.9	12.3	13.5
Operating income	'	'	'	'	'	'	'	'	1.9	3.6	2.7
Interest expense, net	'	'	'	'	'	'	'	'	-0.3	-0.2	-0.3
Loss on early extinguishment of debt	'	'	'	'	'	'	'	'	0	0	0
Income (loss) before income taxes	'	'	'	'	'	'	'	'	2.2	3.8	3
Income tax expense (benefit)	'	'	'	'	'	'	'	'	-0.5	-0.6	-0.6
Equity in income (loss) of subsidiaries	'	'	'	'	'	'	'	'	0	0	0
Income (loss) from continuing operations	'	'	'	'	'	'	'	'	'	3.2	2.4
Income (loss) from discontinued operations, net of tax	'	'	'	'	'	'	'	'	'	0	0
Net Income (Loss) Attributable to Parent	'	'	'	'	'	'	'	'	1.7	3.2	2.4
Consolidation, Eliminations [Member]	'	'	'	'	'	'	'	'	'	'	'
Other Comprehensive Income (Loss), Net of Tax	'	'	'	'	'	'	'	'	8.8	4.8	-5.8
Net sales	'	'	'	'	'	'	'	'	0	0	0
Cost of sales	'	'	'	'	'	'	'	'	0	0	0
Gross profit	'	'	'	'	'	'	'	'	0	0	0
Operating expenses:	'	'	'	'	'	'	'	'	'	'	'
Selling, general and administrative	'	'	'	'	'	'	'	'	0	0	0
Restructuring	'	'	'	'	'	'	'	'	0	0	0
Total operating expenses	'	'	'	'	'	'	'	'	0	0	0
Operating income	'	'	'	'	'	'	'	'	0	0	0
Interest expense, net	'	'	'	'	'	'	'	'	0	0	0
Loss on early extinguishment of debt	'	'	'	'	'	'	'	'	0	0	0
Income (loss) before income taxes	'	'	'	'	'	'	'	'	0	0	0
Income tax expense (benefit)	'	'	'	'	'	'	'	'	0	0	0
Equity in income (loss) of subsidiaries	'	'	'	'	'	'	'	'	-105.1	-108.3	-61
Income (loss) from continuing operations	'	'	'	'	'	'	'	'	'	-108.3	-61
Income (loss) from discontinued operations, net of tax	'	'	'	'	'	'	'	'	'	0	0
Net Income (Loss) Attributable to Parent	'	'	'	'	'	'	'	'	($105.10)	($108.30)	($61)

Consolidating_Guarantor_and_No5

Consolidating Guarantor and Non-Guarantor Financial Information (Schedule of Consolidating Statements of Comprehensive Income) (Details) (USD $)	3 Months Ended								12 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012
Net Income (Loss) Attributable to Parent	$26.20	$18.50	$9.70	$1.10	$13.50	$14.10	$6.20	$7	$55.50	$40.80	($108.40)
Other comprehensive income (loss):	'	'	'	'	'	'	'	'	'	'	'
Minimum pension liability, net of tax	'	'	'	'	'	'	'	'	27.7	-61.5	39.4
Interest rate swap contracts, net of tax	'	'	'	'	'	'	'	'	'	'	3
Other Comprehensive Income (Loss) from Consolidated Subsidiaries	'	'	'	'	'	'	'	'	0	0	0
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	'	'	'	'	'	'	'	'	-4.4	-2.4	2.9
Other Comprehensive Income (Loss), Net of Tax	'	'	'	'	'	'	'	'	-32.1	59.1	-33.5
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	'	'	'	'	'	'	'	'	23.4	99.9	-141.9
Issuer [Member]	'	'	'	'	'	'	'	'	'	'	'
Net Income (Loss) Attributable to Parent	'	'	'	'	'	'	'	'	55.5	40.8	-108.4
Other comprehensive income (loss):	'	'	'	'	'	'	'	'	'	'	'
Minimum pension liability, net of tax	'	'	'	'	'	'	'	'	27.7	-61.5	39.4
Interest rate swap contracts, net of tax	'	'	'	'	'	'	'	'	'	'	3
Other Comprehensive Income (Loss) from Consolidated Subsidiaries	'	'	'	'	'	'	'	'	-4.4	-2.4	2.9
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	'	'	'	'	'	'	'	'	0	0	0
Other Comprehensive Income (Loss), Net of Tax	'	'	'	'	'	'	'	'	-32.1	59.1	-33.5
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	'	'	'	'	'	'	'	'	23.4	99.9	-141.9
Guarantor Companies [Member]	'	'	'	'	'	'	'	'	'	'	'
Net Income (Loss) Attributable to Parent	'	'	'	'	'	'	'	'	103.4	105.1	58.6
Other comprehensive income (loss):	'	'	'	'	'	'	'	'	'	'	'
Minimum pension liability, net of tax	'	'	'	'	'	'	'	'	0	0	0
Interest rate swap contracts, net of tax	'	'	'	'	'	'	'	'	'	'	0
Other Comprehensive Income (Loss) from Consolidated Subsidiaries	'	'	'	'	'	'	'	'	-4.4	-2.4	2.9
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	'	'	'	'	'	'	'	'	0	0	0
Other Comprehensive Income (Loss), Net of Tax	'	'	'	'	'	'	'	'	-4.4	-2.4	2.9
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	'	'	'	'	'	'	'	'	99	102.7	61.5
Non-Guarantor Companies [Member]	'	'	'	'	'	'	'	'	'	'	'
Net Income (Loss) Attributable to Parent	'	'	'	'	'	'	'	'	1.7	3.2	2.4
Other comprehensive income (loss):	'	'	'	'	'	'	'	'	'	'	'
Minimum pension liability, net of tax	'	'	'	'	'	'	'	'	0	0	0
Interest rate swap contracts, net of tax	'	'	'	'	'	'	'	'	'	'	0
Other Comprehensive Income (Loss) from Consolidated Subsidiaries	'	'	'	'	'	'	'	'	0	0	'
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	'	'	'	'	'	'	'	'	-4.4	-2.4	2.9
Other Comprehensive Income (Loss), Net of Tax	'	'	'	'	'	'	'	'	-4.4	-2.4	2.9
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	'	'	'	'	'	'	'	'	-2.7	0.8	5.3
Consolidation, Eliminations [Member]	'	'	'	'	'	'	'	'	'	'	'
Net Income (Loss) Attributable to Parent	'	'	'	'	'	'	'	'	-105.1	-108.3	-61
Other comprehensive income (loss):	'	'	'	'	'	'	'	'	'	'	'
Minimum pension liability, net of tax	'	'	'	'	'	'	'	'	0	0	0
Interest rate swap contracts, net of tax	'	'	'	'	'	'	'	'	'	'	0
Other Comprehensive Income (Loss) from Consolidated Subsidiaries	'	'	'	'	'	'	'	'	8.8	4.8	-5.8
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	'	'	'	'	'	'	'	'	0	0	0
Other Comprehensive Income (Loss), Net of Tax	'	'	'	'	'	'	'	'	8.8	4.8	-5.8
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	'	'	'	'	'	'	'	'	($96.30)	($103.50)	($66.80)

Consolidating_Guarantor_and_No6

Consolidating Guarantor and Non-Guarantor Financial Information (Schedule Of Consolidating Statement Of Cash Flows) (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012
Operating activities:	'	'	'
Net cash provided by (used in) operating activities	$147.60	$114.10	$76.80
Investing activities:	'	'	'
Capital expenditures	-36.9	-36.5	-31.4
Acquisitions, net of cash acquired	-10	-0.2	-1.3
Proceeds from sales of assets	4.7	0.5	0.3
Intercompany	0	0	0
Intercompany debits	'	0	'
Net cash provided by (used in) investing activities	-42.2	-36.2	-32.4
Intercompany	0	0	0
Intercompany	0	0	'
Financing activities:	'	'	'
Debt paid or repurchased	-55.7	-23.2	-57.2
Early repayment of long-term debt	-55.7	-23.2	'
Dividends paid	-11.2	-11	-11
Common stock issued	4.2	3.1	0.7
Shares retained for employee taxes	-3.1	-1.5	-0.5
Payment of deferred financing fees	0	-0.7	0
Other	-1.1	-2.4	-0.1
Net cash used in financing activities	-65.2	-35.7	-68.1
Sale of noncontrolling interest	1.7	0	0
Net cash flows from discontinued operations:	'	'	'
Operating activities	0	-4.9	-43.3
Investing activities	0	4.5	87.5
Net cash provided by (used in) discontinued operations	0	-0.4	44.2
Effect of currency exchange rate changes on cash	-2.7	-1.2	1.5
Net change in cash and cash equivalents	37.5	40.6	22
Cash and cash equivalents at beginning of period	123.6	83	61
Cash and cash equivalents at end of period	161.1	123.6	83
Issuer [Member]	'	'	'
Operating activities:	'	'	'
Net cash provided by (used in) operating activities	-108	-102.7	-112.9
Investing activities:	'	'	'
Capital expenditures	-0.2	-0.2	0
Acquisitions, net of cash acquired	0	0	0
Proceeds from sales of assets	0	0	0
Intercompany	0	0	0
Intercompany debits	882.7	882.7	'
Net cash provided by (used in) investing activities	-0.2	-0.2	0
Intercompany	213.3	169.9	153.8
Intercompany	196.2	63.9	'
Financing activities:	'	'	'
Debt paid or repurchased	'	'	-57.2
Early repayment of long-term debt	-55.7	-23.2	'
Dividends paid	-11.2	-11	-11
Common stock issued	4.2	3.1	0.7
Shares retained for employee taxes	-3.1	-1.5	-0.5
Payment of deferred financing fees	'	-0.7	'
Other	-0.4	0	0
Net cash used in financing activities	147.1	136.6	85.8
Sale of noncontrolling interest	0	'	'
Net cash flows from discontinued operations:	'	'	'
Operating activities	'	-4.9	-43.3
Investing activities	'	4.5	87.5
Net cash provided by (used in) discontinued operations	'	-0.4	44.2
Effect of currency exchange rate changes on cash	0	0	0
Net change in cash and cash equivalents	38.9	33.3	17.1
Cash and cash equivalents at beginning of period	86.6	53.3	36.2
Cash and cash equivalents at end of period	125.5	86.6	53.3
Guarantor Companies [Member]	'	'	'
Operating activities:	'	'	'
Net cash provided by (used in) operating activities	256.5	207.8	186
Investing activities:	'	'	'
Capital expenditures	-35.3	-34.4	-30.5
Acquisitions, net of cash acquired	-11.7	-0.2	-1.8
Proceeds from sales of assets	4.7	0.5	0.3
Intercompany	-213.3	-169.9	-153.8
Intercompany debits	'	0	'
Net cash provided by (used in) investing activities	-255.6	-204	-185.8
Intercompany	0	0	0
Intercompany	662	789.7	'
Financing activities:	'	'	'
Debt paid or repurchased	'	'	0
Early repayment of long-term debt	0	0	'
Dividends paid	0	0	0
Common stock issued	0	0	0
Shares retained for employee taxes	0	0	0
Payment of deferred financing fees	'	0	'
Other	-0.7	-2.4	-0.1
Net cash used in financing activities	-0.7	-2.4	-0.1
Sale of noncontrolling interest	0	'	'
Net cash flows from discontinued operations:	'	'	'
Operating activities	'	0	0
Investing activities	'	0	0
Net cash provided by (used in) discontinued operations	'	0	0
Effect of currency exchange rate changes on cash	0	0	0
Net change in cash and cash equivalents	0.2	1.4	0.1
Cash and cash equivalents at beginning of period	-2.3	-3.7	-3.8
Cash and cash equivalents at end of period	-2.1	-2.3	-3.7
Non-Guarantor Companies [Member]	'	'	'
Operating activities:	'	'	'
Net cash provided by (used in) operating activities	-0.9	9	3.7
Investing activities:	'	'	'
Capital expenditures	-1.4	-1.9	-0.9
Acquisitions, net of cash acquired	0	0	0.5
Proceeds from sales of assets	0	0	0
Intercompany	0	0	0
Intercompany debits	'	0	'
Net cash provided by (used in) investing activities	-1.4	-1.9	-0.4
Intercompany	0	0	0
Intercompany	24.5	29.1	'
Financing activities:	'	'	'
Debt paid or repurchased	'	'	0
Early repayment of long-term debt	0	0	'
Dividends paid	0	0	0
Common stock issued	0	0	0
Shares retained for employee taxes	0	0	0
Payment of deferred financing fees	'	0	'
Other	0	0	0
Net cash used in financing activities	3.4	0	0
Sale of noncontrolling interest	3.4	'	'
Net cash flows from discontinued operations:	'	'	'
Operating activities	'	0	0
Investing activities	'	0	0
Net cash provided by (used in) discontinued operations	'	0	0
Effect of currency exchange rate changes on cash	-2.7	-1.2	1.5
Net change in cash and cash equivalents	-1.6	5.9	4.8
Cash and cash equivalents at beginning of period	39.3	33.4	28.6
Cash and cash equivalents at end of period	37.7	39.3	33.4
Consolidation, Eliminations [Member]	'	'	'
Operating activities:	'	'	'
Net cash provided by (used in) operating activities	0	0	0
Investing activities:	'	'	'
Capital expenditures	0	0	0
Acquisitions, net of cash acquired	1.7	0	0
Proceeds from sales of assets	0	0	0
Intercompany	213.3	169.9	153.8
Intercompany debits	-882.7	-882.7	'
Net cash provided by (used in) investing activities	215	169.9	153.8
Intercompany	-213.3	-169.9	-153.8
Intercompany	-882.7	-882.7	'
Financing activities:	'	'	'
Debt paid or repurchased	'	'	0
Early repayment of long-term debt	0	0	'
Dividends paid	0	0	0
Common stock issued	0	0	0
Shares retained for employee taxes	0	0	0
Payment of deferred financing fees	'	0	'
Other	0	0	0
Net cash used in financing activities	-215	-169.9	-153.8
Sale of noncontrolling interest	-1.7	'	'
Net cash flows from discontinued operations:	'	'	'
Operating activities	'	0	0
Investing activities	'	0	0
Net cash provided by (used in) discontinued operations	'	0	0
Effect of currency exchange rate changes on cash	0	0	0
Net change in cash and cash equivalents	0	0	0
Cash and cash equivalents at beginning of period	0	0	0
Cash and cash equivalents at end of period	$0	$0	$0