Fair Value Measurements (Fair Value of Assets and Liabilities Measured on Recurring Basis) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Sep. 30, 2015
Assets:
Cash equivalents	$ 134	$ 434
Deferred compensation	5,482	4,783
Liabilities:
Deferred compensation	5,315	4,487
Fair Value, Inputs, Level 1
Assets:
Cash equivalents	134	434
Deferred compensation	2,502	1,879
Fair Value, Inputs, Level 2
Assets:
Deferred compensation	2,980	2,904
Liabilities:
Deferred compensation	$ 5,315	$ 4,487