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Retirement Plans (Strategic Allocation of Plan Assets) (Details)
12 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2013
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 40.00%    
Equity investments tactical range, minimum 30.00%    
Equity investments tactical range, maximum 50.00%    
Actual asset allocations      
Actual plan asset allocations 39.00% 40.00% 40.00%
Large Capitalization Stocks [Member]      
Strategic asset allocation      
Defined Benefit Plan, Target Plan Asset Allocations 26.00%    
Small Capitalization Stocks [Member]      
Strategic asset allocation      
Defined Benefit Plan, Target Plan Asset Allocations 5.00%    
International Stocks [Member]      
Strategic asset allocation      
Defined Benefit Plan, Target Plan Asset Allocations 9.00%    
Fixed Income Funds [Member]      
Strategic asset allocation      
Defined Benefit Plan, Target Plan Asset Allocations   60.00%  
Equity investments tactical range, minimum 50.00%    
Equity investments tactical range, maximum 70.00%    
Actual asset allocations      
Actual plan asset allocations 60.00% 59.00% 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 1.00% 1.00% 1.00%