Fair Value Measurements Available-For-Sale Securities (Details) (USD $)	12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 64,023,000	$ 55,339,000
Available For Sale Securities Gross Unrealized Gain Accumulated In Investments	8,706,000	9,061,000
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments	(47,000)	(2,000)
Fair value	72,682,000	64,398,000
Available-for-sale Securities, Other Disclosure Items [Abstract]
Available-for-sale Securities, Supplemental Executive Benefit Plans	44,500,000	41,800,000
Available-for-sale Securities, Gross Realized Gains	2,200,000
Equity Funds Domestic [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	27,043,000	25,779,000
Available For Sale Securities Gross Unrealized Gain Accumulated In Investments	7,476,000	8,183,000
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments	(23,000)	0
Fair value	34,496,000	33,962,000
Equity Funds Foreign [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	4,536,000	5,568,000
Available For Sale Securities Gross Unrealized Gain Accumulated In Investments	1,062,000	682,000
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments	0	0
Fair value	5,598,000	6,250,000
Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	28,016,000	22,358,000
Available For Sale Securities Gross Unrealized Gain Accumulated In Investments	168,000	196,000
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments	(24,000)	(2,000)
Fair value	28,160,000	22,552,000
Money Market Funds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	4,428,000	1,634,000
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	$ 4,428,000	$ 1,634,000