Employee Benefit Plans (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013
Deferred Compensation Arrangement With Individual Postretirement Benefits [Line Items]
Defined contribution plan recognized expenses	$ 3,900	$ 5,900	$ 5,300
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 adjustment	$ 100
Deferred compensation plan assets	5,800
Deferred compensation liabilities	4,449	4,487
Deferred compensation recorded liability	400
Cash Surrender value of life insurance	$ 4,600
Deferred Compensation
Deferred Compensation Arrangement With Individual Postretirement Benefits [Line Items]
Deferred compensation requisite service period	10 years
Retiree Medical Plan
Deferred Compensation Arrangement With Individual Postretirement Benefits [Line Items]
Deferred compensation requisite service period	10 years
Unfunded liability	$ 1,400	700
Retiree Medical Plan | Maximum
Deferred Compensation Arrangement With Individual Postretirement Benefits [Line Items]
Net periodic postretirement benefit cost		$ 100	$ 100	$ 100