Fair Value Measurements (Fair Value of Assets and Liabilities Measured on Recurring Basis) (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Sep. 30, 2015
Assets:
Cash equivalents	$ 335	$ 434
Deferred compensation	5,581	4,783
Liabilities:
Deferred compensation	5,154	4,487
Fair Value, Inputs, Level 1
Assets:
Cash equivalents	335	434
Deferred compensation	1,609	1,879
Fair Value, Inputs, Level 2
Assets:
Deferred compensation	3,972	2,904
Liabilities:
Deferred compensation	$ 5,154	$ 4,487