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Receivables And Concentration Of Credit Risk (Narrative) (Details) $ in Millions | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2018 USD ($) customer | Jun. 30, 2017 | Jun. 30, 2018 USD ($) customer | Jun. 30, 2017 | Sep. 30, 2017 USD ($) customer | Jul. 02, 2017 customer
Receivables and Concentration of Credit Risk [Line Items] |  |  |  |  |  |
Allowance for uncollectible receivables | $ | $ 28.6 |  | $ 28.6 |  | $ 23.5 |
Major Customer Three [Member] | Sales Revenue Net And/Or Trade Accounts Receivable [Member] |  |  |  |  |  |
Receivables and Concentration of Credit Risk [Line Items] |  |  |  |  |  |
Number of major customers accounting for a significant percentage of sales and/or receivables volume | customer | 3 |  | 3 |  | 3 | 3
Major Customer Three [Member] | Sales Revenue Net And/Or Trade Accounts Receivable [Member] | Minimum [Member] |  |  |  |  |  |
Receivables and Concentration of Credit Risk [Line Items] |  |  |  |  |  |
Concentration risk | 10.00% |  | 10.00% |  | 10.00% | 10.00%
Major Customer Three [Member] | Net Sales [Member] |  |  |  |  |  |
Receivables and Concentration of Credit Risk [Line Items] |  |  |  |  |  |
Concentration risk | 40.00% | 39.00% | 39.00% | 38.00% |  |
Major Customer Three [Member] | Trade Receivable [Member] |  |  |  |  |  |
Receivables and Concentration of Credit Risk [Line Items] |  |  |  |  |  |
Concentration risk | 29.00% |  | 29.00% |  | 36.00% |

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- Definition For an unclassified balance sheet, a valuation allowance for receivables due a company that are expected to be uncollectible. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5074-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.4) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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