Fair Value Measurements Available-For-Sale Securities (Details) (USD $)	12 Months Ended
	Sep. 30, 2014	Sep. 30, 2013
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 67,466,000	$ 64,023,000
Available For Sale Securities Gross Unrealized Gain Accumulated In Investments	12,160,000	8,706,000
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments	(13,000)	(47,000)
Fair value	79,613,000	72,682,000
Available-for-sale Securities, Other Disclosure Items [Abstract]
Available-for-sale Securities, Supplemental Executive Benefit Plans	46,200,000	44,500,000
Available-for-sale Securities, Gross Realized Gains	1,300,000	2,200,000
Equity Funds Domestic [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	26,633,000	27,043,000
Available For Sale Securities Gross Unrealized Gain Accumulated In Investments	10,136,000	7,476,000
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments	0	(23,000)
Fair value	36,769,000	34,496,000
Equity Funds Foreign [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	5,382,000	4,536,000
Available For Sale Securities Gross Unrealized Gain Accumulated In Investments	1,863,000	1,062,000
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments	0	0
Fair value	7,245,000	5,598,000
Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	33,266,000	28,016,000
Available For Sale Securities Gross Unrealized Gain Accumulated In Investments	161,000	168,000
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments	(13,000)	(24,000)
Fair value	33,414,000	28,160,000
Money Market Funds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	2,185,000	4,428,000
Available For Sale Securities Gross Unrealized Gain Accumulated In Investments	0	0
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments	0	0
Fair value	$ 2,185,000	$ 4,428,000