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Fair Value Measurements Available-For-Sale Securities (Details) - USD ($)
$ in Thousands
Jun. 30, 2016
Sep. 30, 2015
Schedule Of Available For Sale Securities [Line Items]    
Available For Sale Securities Amortized Cost $ 66,239 $ 66,399
Gross Unrealized Gain 6,471 8,343
Gross Unrealized Loss (965) (542)
Fair value 71,745 74,200
Available-for-sale Securities, Other Disclosure Items [Abstract]    
Available-for-sale Securities, Supplemental Executive Benefit Plans 40,400 41,700
Equity Funds Domestic [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Available For Sale Securities Amortized Cost 28,377 27,643
Gross Unrealized Gain 5,549 7,332
Gross Unrealized Loss (962) (456)
Fair value 32,964 34,519
Equity Funds Foreign [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Available For Sale Securities Amortized Cost 5,357 5,261
Gross Unrealized Gain 747 905
Gross Unrealized Loss 0 (66)
Fair value 6,104 6,100
Debt Securities [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Available For Sale Securities Amortized Cost 31,147 32,423
Gross Unrealized Gain 175 106
Gross Unrealized Loss (3) (20)
Fair value 31,319 32,509
Money Market Funds [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Available For Sale Securities Amortized Cost 1,358 1,072
Gross Unrealized Gain 0 0
Gross Unrealized Loss 0 0
Fair value $ 1,358 $ 1,072