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Segment Information (Narrative) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended		12 Months Ended											12 Months Ended
	Sep. 30, 2014 business_segments	Sep. 30, 2013	Sep. 30, 2014 Customer Concentration Risk [Member] Major Customers, Group One customer	Sep. 30, 2014 Customer Concentration Risk [Member] Major Customers, Group One Sales Revenue, Goods, Gross [Member]	Sep. 30, 2014 Customer Concentration Risk [Member] Major Customers, Group Two customer	Sep. 30, 2014 Customer Concentration Risk [Member] Major Customers, Group Two Sales Revenue, Goods, Gross [Member]	Sep. 30, 2014 Customer Concentration Risk [Member] Ferguson Enterprises Sales Revenue, Goods, Gross [Member]	Sep. 30, 2013 Customer Concentration Risk [Member] Ferguson Enterprises Sales Revenue, Goods, Gross [Member]	Sep. 30, 2012 Customer Concentration Risk [Member] Ferguson Enterprises Sales Revenue, Goods, Gross [Member]	Sep. 30, 2014 Customer Concentration Risk [Member] Ferguson Enterprises Sales Revenue, Goods, Gross [Member] Mueller Co. [Member]	Sep. 30, 2014 Customer Concentration Risk [Member] Ferguson Enterprises Sales Revenue, Goods, Gross [Member] Anvil [Member]	Sep. 30, 2014 Customer Concentration Risk [Member] Ferguson Enterprises Accounts Receivable [Member]	Sep. 30, 2013 Customer Concentration Risk [Member] Ferguson Enterprises Accounts Receivable [Member]	Sep. 30, 2014 Customer Concentration Risk [Member] HD Supply Sales Revenue, Goods, Gross [Member]	Sep. 30, 2013 Customer Concentration Risk [Member] HD Supply Sales Revenue, Goods, Gross [Member]	Sep. 30, 2011 Customer Concentration Risk [Member] HD Supply Sales Revenue, Goods, Gross [Member]	Sep. 30, 2014 Customer Concentration Risk [Member] HD Supply Sales Revenue, Goods, Gross [Member] Mueller Co. [Member]	Sep. 30, 2014 Customer Concentration Risk [Member] HD Supply Sales Revenue, Goods, Gross [Member] Anvil [Member]	Sep. 30, 2014 Customer Concentration Risk [Member] HD Supply Accounts Receivable [Member]	Sep. 30, 2013 Customer Concentration Risk [Member] HD Supply Accounts Receivable [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	$ 182.1	$ 164.5										$ 25.7	$ 22.9						$ 17.7	$ 24.4

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Segment Reporting, Number of Major Customers

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Amount due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer), for goods or services (including trade receivables) that have been delivered or sold in the normal course of business, reduced to the estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.3-4)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682



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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

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-Paragraph 3

-Subparagraph a(1)

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-Name Regulation S-X (SX)

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For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 21

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13537-108611



Reference 2: http://www.xbrl.org/2003/role/presentationRef

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-Name Accounting Standards Codification

-Topic 275

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-Section 50

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-URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6404-108592



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Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

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