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Fair Value Measurements Available-For-Sale Securities (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Sep. 30, 2017
Schedule Of Available For Sale Securities [Line Items]    
Available For Sale Securities Amortized Cost $ 83,933 $ 77,244
Gross Unrealized Gain 10,229 11,203
Gross Unrealized Loss (497) (38)
Fair value 93,665 88,409
Available-for-sale Securities, Other Disclosure Items [Abstract]    
Available-for-sale Securities, Supplemental Executive Benefit Plans 46,200 42,900
Equity Funds Domestic [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Available For Sale Securities Amortized Cost 25,515 25,361
Gross Unrealized Gain 8,194 8,920
Gross Unrealized Loss (95) 0
Fair value 33,614 34,281
Equity Funds Foreign [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Available For Sale Securities Amortized Cost 4,138 4,581
Gross Unrealized Gain 2,031 2,235
Gross Unrealized Loss 0 0
Fair value 6,169 6,816
Fixed Income Funds [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Available For Sale Securities Amortized Cost 16,548 16,391
Gross Unrealized Gain 0 2
Gross Unrealized Loss (240) (22)
Fair value 16,308 16,371
Debt Securities [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Available For Sale Securities Amortized Cost 31,295 29,074
Gross Unrealized Gain 4 46
Gross Unrealized Loss (162) (16)
Fair value 31,137 29,104
Money Market Funds [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Available For Sale Securities Amortized Cost 6,437 1,837
Gross Unrealized Gain 0 0
Gross Unrealized Loss 0 0
Fair value $ 6,437 $ 1,837