Fair Value Measurements Available-For-Sale Securities (Details) (USD $)	Dec. 31, 2013	Sep. 30, 2013
Schedule Of Available For Sale Securities [Line Items]
Available For Sale Securities Amortized Cost	$ 62,901,000	$ 64,023,000
Gross Unrealized Gain	12,511,000	8,706,000
Gross Unrealized Loss	(22,000)	(47,000)
Fair value	75,390,000	72,682,000
Available-for-sale Securities, Other Disclosure Items [Abstract]
Available-for-sale Securities, Supplemental Executive Benefit Plans	47,400,000	44,500,000
Equity Funds Domestic [Member]
Schedule Of Available For Sale Securities [Line Items]
Available For Sale Securities Amortized Cost	27,129,000	27,043,000
Gross Unrealized Gain	10,575,000	7,476,000
Gross Unrealized Loss	0	(23,000)
Fair value	37,704,000	34,496,000
Equity Funds Foreign [Member]
Schedule Of Available For Sale Securities [Line Items]
Available For Sale Securities Amortized Cost	4,536,000	4,536,000
Gross Unrealized Gain	1,760,000	1,062,000
Gross Unrealized Loss	0	0
Fair value	6,296,000	5,598,000
Debt Securities [Member]
Schedule Of Available For Sale Securities [Line Items]
Available For Sale Securities Amortized Cost	27,860,000	28,016,000
Gross Unrealized Gain	176,000	168,000
Gross Unrealized Loss	(22,000)	(24,000)
Fair value	28,014,000	28,160,000
Money Market Funds [Member]
Schedule Of Available For Sale Securities [Line Items]
Available For Sale Securities Amortized Cost	3,376,000	4,428,000
Gross Unrealized Gain	0	0
Gross Unrealized Loss	0	0
Fair value	$ 3,376,000	$ 4,428,000