Fair Value Measurements (Fair Value of Assets and Liabilities Measured on Recurring Basis) (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Sep. 30, 2015
Assets:
Cash equivalents	$ 234	$ 434
Deferred compensation	5,503	4,783
Liabilities:
Deferred compensation	5,248	4,487
Fair Value, Inputs, Level 1
Assets:
Cash equivalents	234	434
Deferred compensation	1,581	1,879
Fair Value, Inputs, Level 2
Assets:
Deferred compensation	3,922	2,904
Liabilities:
Deferred compensation	$ 5,248	$ 4,487