Employee Benefit Plans (Narrative) (Details) (USD $)	12 Months Ended						12 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2014 Deferred Compensation	Sep. 30, 2014 Retiree Medical Plan	Sep. 30, 2013 Retiree Medical Plan	Sep. 30, 2013 Retiree Medical Plan Maximum	Sep. 30, 2012 Retiree Medical Plan Maximum	Sep. 30, 2011 Retiree Medical Plan Maximum
Deferred Compensation Arrangement With Individual Postretirement Benefits [Line Items]
Defined contribution plan recognized expenses	$ 5,300,000	$ 4,900,000	$ 4,200,000
Percentage of employee based salary permitted for deferral under the plan	50.00%
Percentage of employee annual bonus permitted for deferral under the plan	100.00%
Deferred compensation expense	200,000
Deferred compensation plan assets	3,526,000	2,862,000
Deferred compensation liabilities	3,688,000	2,862,000
Deferred compensation requisite service period				on or after age 65 and the completion of at least 10 years of continuous employment.	10 years of service who are age 55 or older but less than 65.
Deferred compensation recorded liability	500,000
Cash Surrender value of life insurance	4,400,000
Unfunded liability					700,000	700,000
Net periodic postretirement benefit cost							$ 100,000	$ 100,000	$ 100,000