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Segment Information (Narrative) (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended |  | 12 Months Ended |  |  | 12 Months Ended |  |
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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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- Definition 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 3 -Subparagraph a(1) -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 4 -Article 5 + Details
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