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Fair Value Measurements Available-For-Sale Securities (Details) - USD ($)
$ in Thousands
Sep. 30, 2016
Sep. 30, 2015
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost $ 65,572 $ 66,399
Gross Unrealized Gain 7,729 8,343
Gross Unrealized Loss (600) (542)
Fair value 72,701 74,200
Available-for-sale Securities, Other Disclosure Items [Abstract]    
Available-for-sale Securities, Supplemental Executive Benefit Plans 41,300 41,700
Equity Funds Domestic [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 26,692 27,643
Gross Unrealized Gain 6,419 7,332
Gross Unrealized Loss (590) (456)
Fair value 32,521 34,519
Equity Funds Foreign [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 4,954 5,261
Gross Unrealized Gain 1,202 905
Gross Unrealized Loss 0 (66)
Fair value 6,156 6,100
Debt Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 31,296 32,423
Gross Unrealized Gain 108 106
Gross Unrealized Loss (10) (20)
Fair value 31,394 32,509
Money Market Funds [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 2,630 1,072
Gross Unrealized Gain 0 0
Gross Unrealized Loss 0 0
Fair value $ 2,630 $ 1,072