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Fair Value Measurements Available-For-Sale Securities (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Sep. 30, 2016
Schedule Of Available For Sale Securities [Line Items]    
Available For Sale Securities Amortized Cost $ 80,036 $ 65,572
Gross Unrealized Gain 9,658 7,729
Gross Unrealized Loss (83) (600)
Fair value 89,611 72,701
Available-for-sale Securities, Other Disclosure Items [Abstract]    
Available-for-sale Securities, Supplemental Executive Benefit Plans 42,300 41,300
Equity Funds Domestic [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Available For Sale Securities Amortized Cost 25,236 26,692
Gross Unrealized Gain 7,749 6,419
Gross Unrealized Loss (17) (590)
Fair value 32,968 32,521
Equity Funds Foreign [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Available For Sale Securities Amortized Cost 4,581 4,954
Gross Unrealized Gain 1,857 1,202
Gross Unrealized Loss 0 0
Fair value 6,438 6,156
Fixed Income Funds [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Available For Sale Securities Amortized Cost 15,928  
Gross Unrealized Gain 0  
Gross Unrealized Loss (36)  
Fair value 15,892  
Debt Securities [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Available For Sale Securities Amortized Cost 31,407 31,296
Gross Unrealized Gain 52 108
Gross Unrealized Loss (30) (10)
Fair value 31,429 31,394
Money Market Funds [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Available For Sale Securities Amortized Cost 2,884 2,630
Gross Unrealized Gain 0 0
Gross Unrealized Loss 0 0
Fair value $ 2,884 $ 2,630