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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%