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Fair Value Measurements Available-For-Sale Securities (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Sep. 30, 2016
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost $ 77,244 $ 65,572
Gross Unrealized Gain 11,203 7,729
Gross Unrealized Loss (38) (600)
Fair value 88,409 72,701
Available-for-sale Securities, Other Disclosure Items [Abstract]    
Available-for-sale Securities, Supplemental Executive Benefit Plans 42,900 41,300
Equity Funds Domestic [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 25,361 26,692
Gross Unrealized Gain 8,920 6,419
Gross Unrealized Loss 0 (590)
Fair value 34,281 32,521
Equity Funds Foreign [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 4,581 4,954
Gross Unrealized Gain 2,235 1,202
Gross Unrealized Loss 0 0
Fair value 6,816 6,156
Fixed Income Funds [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 16,391  
Gross Unrealized Gain 2  
Gross Unrealized Loss (22)  
Fair value 16,371  
Debt Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 29,074 31,296
Gross Unrealized Gain 46 108
Gross Unrealized Loss (16) (10)
Fair value 29,104 31,394
Money Market Funds [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 1,837 2,630
Gross Unrealized Gain 0 0
Gross Unrealized Loss 0 0
Fair value $ 1,837 $ 2,630