Fair Value Measurements (Fair Value of Assets Measured on Recurring Basis) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Sep. 30, 2014
Assets:
Cash equivalents	$ 234	$ 10,535
Deferred compensation	5,135	3,526
Liabilities:
Deferred compensation	4,947	3,688
Fair Value, Inputs, Level 1
Assets:
Cash equivalents	234	10,535
Deferred compensation	2,001	724
Fair Value, Inputs, Level 2
Assets:
Deferred compensation	3,134	2,802
Liabilities:
Deferred compensation	$ 4,947	$ 3,688