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Fair Value Measurements Available-For-Sale Securities (Details) - USD ($)
$ in Thousands
Jun. 30, 2015
Sep. 30, 2014
Schedule Of Available For Sale Securities [Line Items]    
Available For Sale Securities Amortized Cost $ 67,883 $ 67,466
Gross Unrealized Gain 11,793 12,160
Gross Unrealized Loss (187) (13)
Fair value 79,489 79,613
Available-for-sale Securities, Other Disclosure Items [Abstract]    
Available-for-sale Securities, Supplemental Executive Benefit Plans 46,100 46,200
Equity Funds Domestic [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Available For Sale Securities Amortized Cost 28,023 26,633
Gross Unrealized Gain 10,010 10,136
Gross Unrealized Loss (163) 0
Fair value 37,870 36,769
Equity Funds Foreign [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Available For Sale Securities Amortized Cost 5,279 5,382
Gross Unrealized Gain 1,705 1,863
Gross Unrealized Loss 0 0
Fair value 6,984 7,245
Debt Securities [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Available For Sale Securities Amortized Cost 33,364 33,266
Gross Unrealized Gain 78 161
Gross Unrealized Loss (24) (13)
Fair value 33,418 33,414
Money Market Funds [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Available For Sale Securities Amortized Cost 1,217 2,185
Gross Unrealized Gain 0 0
Gross Unrealized Loss 0 0
Fair value $ 1,217 $ 2,185