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Retirement Plans (Strategic Allocation of Plan Assets) (Details)
12 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2014
Strategic asset allocation      
Defined Benefit Plan, Target Plan Asset Allocations 100.00%    
Actual asset allocations      
Actual plan asset allocations 100.00% 100.00% 100.00%
Equity Securities [Member]      
Strategic asset allocation      
Defined Benefit Plan, Target Plan Asset Allocations 30.00% 40.00%  
Equity investments tactical range, minimum 30.00%    
Equity investments tactical range, maximum 50.00%    
Actual asset allocations      
Actual plan asset allocations 29.00% 39.00% 40.00%
Large Capitalization Stocks [Member]      
Strategic asset allocation      
Defined Benefit Plan, Target Plan Asset Allocations 19.00%    
Small Capitalization Stocks [Member]      
Strategic asset allocation      
Defined Benefit Plan, Target Plan Asset Allocations 4.00%    
International Stocks [Member]      
Strategic asset allocation      
Defined Benefit Plan, Target Plan Asset Allocations 7.00%    
Fixed Income Securities [Member]      
Strategic asset allocation      
Defined Benefit Plan, Target Plan Asset Allocations 70.00%    
Fixed Income Funds [Member]      
Strategic asset allocation      
Equity investments tactical range, minimum 50.00%    
Equity investments tactical range, maximum 70.00%    
Actual asset allocations      
Actual plan asset allocations 69.00% 60.00% 59.00%
Cash and Cash Equivalents [Member]      
Strategic asset allocation      
Defined Benefit Plan, Target Plan Asset Allocations 0.00%    
Equity investments tactical range, minimum 0.00%    
Equity investments tactical range, maximum 5.00%    
Actual asset allocations      
Actual plan asset allocations 2.00% 1.00% 1.00%