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Receivables And Concentration Of Credit Risk (Narrative) (Details) $ in Millions | 3 Months Ended |
--- | --- | ---
Dec. 30, 2018 USD ($) customer | Dec. 31, 2017 customer | Sep. 30, 2018 USD ($)
Receivables and Concentration of Credit Risk [Line Items] |  |  |
Allowance for uncollectible receivables | $ | $ 4.5 |  | $ 4.2
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 |
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% |
Major Customer Three [Member] | Net Sales [Member] |  |  |
Receivables and Concentration of Credit Risk [Line Items] |  |  |
Concentration risk | 30.10% | 30.60% |
Major Customer Three [Member] | Trade Receivable [Member] |  |  |
Receivables and Concentration of Credit Risk [Line Items] |  |  |
Concentration risk | 33.10% |  | 37.20%

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