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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%