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Receivables And Concentration Of Credit Risk (Narrative) (Details) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Jun. 30, 2019 USD ($) customer | Jun. 30, 2018 | Jun. 30, 2019 USD ($) customer | Jun. 30, 2018 | Sep. 30, 2018 USD ($) customer
Receivables [Line Items] |  |  |  |  |
Allowance for uncollectible receivables | $ | $ 4.9 |  | $ 4.9 |  | $ 4.2
Major Customer Three [Member] | Sales Revenue Net And/Or Trade Accounts Receivable [Member] |  |  |  |  |
Receivables [Line Items] |  |  |  |  |
Number of major customers accounting for a significant percentage of sales and/or receivables volume | customer | 3 |  | 3 |  | 3
Major Customer Three [Member] | Sales Revenue Net And/Or Trade Accounts Receivable [Member] | Minimum [Member] |  |  |  |  |
Receivables [Line Items] |  |  |  |  |
Concentration risk | 10.00% |  | 10.00% |  | 10.00%
Major Customer Three [Member] | Net Sales [Member] |  |  |  |  |
Receivables [Line Items] |  |  |  |  |
Concentration risk | 36.70% | 36.70% | 35.00% | 32.70% |
Major Customer Three [Member] | Trade Receivable [Member] |  |  |  |  |
Receivables [Line Items] |  |  |  |  |
Concentration risk | 42.30% |  | 42.30% |  | 37.20%

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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