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Receivables And Concentration Of Credit Risk (Narrative) (Details)
$ in Millions
3 Months Ended 6 Months Ended
Mar. 29, 2020
USD ($)
customer
Mar. 31, 2019
customer
Mar. 29, 2020
USD ($)
customer
Mar. 31, 2019
customer
Sep. 30, 2019
USD ($)
customer
Receivables [Line Items]          
Allowance for uncollectible receivables | $ $ 5.3   $ 5.3   $ 4.9
Major Customer Three [Member] | Net Sales And/Or Trade Receivables [Member]          
Receivables [Line Items]          
Number of major customers 3 3 3 3  
Major Customer Three [Member] | Net Sales And/Or Trade Receivables [Member] | Minimum [Member]          
Receivables [Line Items]          
Concentration risk 10.00%   10.00%   10.00%
Major Customer Three [Member] | Sales Revenue, Goods, Net [Member]          
Receivables [Line Items]          
Concentration risk 37.20% 37.70% 34.10% 33.90%  
Major Customer Three [Member] | Trade Receivable [Member]          
Receivables [Line Items]          
Number of major customers 3   3   3
Concentration risk 28.00%   28.00%   29.90%