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Fair Value Measurements Available-For-Sale Securities (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Sep. 30, 2015
Schedule Of Available For Sale Securities [Line Items]    
Available For Sale Securities Amortized Cost $ 68,621 $ 66,399
Gross Unrealized Gain 7,751 8,343
Gross Unrealized Loss (1,193) (542)
Fair value 75,179 74,200
Available-for-sale Securities, Other Disclosure Items [Abstract]    
Available-for-sale Securities, Supplemental Executive Benefit Plans 42,100 41,700
Equity Funds Domestic [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Available For Sale Securities Amortized Cost 30,054 27,643
Gross Unrealized Gain 6,843 7,332
Gross Unrealized Loss (1,133) (456)
Fair value 35,764 34,519
Equity Funds Foreign [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Available For Sale Securities Amortized Cost 5,346 5,261
Gross Unrealized Gain 868 905
Gross Unrealized Loss 0 (66)
Fair value 6,214 6,100
Debt Securities [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Available For Sale Securities Amortized Cost 33,149 32,423
Gross Unrealized Gain 40 106
Gross Unrealized Loss (60) (20)
Fair value 33,129 32,509
Money Market Funds [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Available For Sale Securities Amortized Cost 72 1,072
Gross Unrealized Gain 0 0
Gross Unrealized Loss 0 0
Fair value $ 72 $ 1,072