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Fair Value Measurements Available-For-Sale Securities (Details) - USD ($)
$ in Thousands
Mar. 31, 2016
Sep. 30, 2015
Schedule Of Available For Sale Securities [Line Items]    
Available For Sale Securities Amortized Cost $ 69,340 $ 66,399
Gross Unrealized Gain 6,332 8,343
Gross Unrealized Loss (1,125) (542)
Fair value 74,547 74,200
Available-for-sale Securities, Other Disclosure Items [Abstract]    
Available-for-sale Securities, Supplemental Executive Benefit Plans 41,100 41,700
Equity Funds Domestic [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Available For Sale Securities Amortized Cost 26,548 27,643
Gross Unrealized Gain 5,425 7,332
Gross Unrealized Loss (1,115) (456)
Fair value 30,858 34,519
Equity Funds Foreign [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Available For Sale Securities Amortized Cost 5,037 5,261
Gross Unrealized Gain 775 905
Gross Unrealized Loss 0 (66)
Fair value 5,812 6,100
Debt Securities [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Available For Sale Securities Amortized Cost 33,355 32,423
Gross Unrealized Gain 132 106
Gross Unrealized Loss (10) (20)
Fair value 33,477 32,509
Money Market Funds [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Available For Sale Securities Amortized Cost 4,400 1,072
Gross Unrealized Gain 0 0
Gross Unrealized Loss 0 0
Fair value $ 4,400 $ 1,072