Fair Value Measurements Available-For-Sale Securities (Details) (USD $)	6 Months Ended
	Mar. 31, 2013	Mar. 31, 2014	Sep. 30, 2013
Schedule Of Available For Sale Securities [Line Items]
Available For Sale Securities Amortized Cost		$ 63,568,000	$ 64,023,000
Gross Unrealized Gain		12,110,000	8,706,000
Gross Unrealized Loss		(8,000)	(47,000)
Fair value		75,670,000	72,682,000
Available-for-sale Securities, Other Disclosure Items [Abstract]
Available-for-sale Securities, Supplemental Executive Benefit Plans		47,200,000	44,500,000
Available-for-sale Securities, Gross Realized Gains	2,700,000
Equity Funds Domestic [Member]
Schedule Of Available For Sale Securities [Line Items]
Available For Sale Securities Amortized Cost		27,226,000	27,043,000
Gross Unrealized Gain		10,052,000	7,476,000
Gross Unrealized Loss		0	(23,000)
Fair value		37,278,000	34,496,000
Equity Funds Foreign [Member]
Schedule Of Available For Sale Securities [Line Items]
Available For Sale Securities Amortized Cost		5,118,000	4,536,000
Gross Unrealized Gain		1,867,000	1,062,000
Gross Unrealized Loss		0	0
Fair value		6,985,000	5,598,000
Debt Securities [Member]
Schedule Of Available For Sale Securities [Line Items]
Available For Sale Securities Amortized Cost		28,320,000	28,016,000
Gross Unrealized Gain		191,000	168,000
Gross Unrealized Loss		(8,000)	(24,000)
Fair value		28,503,000	28,160,000
Money Market Funds [Member]
Schedule Of Available For Sale Securities [Line Items]
Available For Sale Securities Amortized Cost		2,904,000	4,428,000
Gross Unrealized Gain		0	0
Gross Unrealized Loss		0	0
Fair value		$ 2,904,000	$ 4,428,000