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Fair Value Measurements Available-For-Sale Securities (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Sep. 30, 2016
Schedule Of Available For Sale Securities [Line Items]    
Available For Sale Securities Amortized Cost $ 76,315 $ 65,572
Gross Unrealized Gain 6,864 7,729
Gross Unrealized Loss (1,049) (600)
Fair value 82,130 72,701
Available-for-sale Securities, Other Disclosure Items [Abstract]    
Available-for-sale Securities, Supplemental Executive Benefit Plans 40,400 41,300
Equity Funds Domestic [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Available For Sale Securities Amortized Cost 27,792 26,692
Gross Unrealized Gain 5,853 6,419
Gross Unrealized Loss (903) (590)
Fair value 32,742 32,521
Equity Funds Foreign [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Available For Sale Securities Amortized Cost 5,102 4,954
Gross Unrealized Gain 992 1,202
Gross Unrealized Loss 0 0
Fair value 6,094 6,156
Fixed Income Funds [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Available For Sale Securities Amortized Cost 10,428  
Gross Unrealized Gain 0  
Gross Unrealized Loss (50)  
Fair value 10,378  
Debt Securities [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Available For Sale Securities Amortized Cost 31,380 31,296
Gross Unrealized Gain 19 108
Gross Unrealized Loss (96) (10)
Fair value 31,303 31,394
Money Market Funds [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Available For Sale Securities Amortized Cost 1,613 2,630
Gross Unrealized Gain 0 0
Gross Unrealized Loss 0 0
Fair value $ 1,613 $ 2,630