Income Taxes (Income Tax Reconciliation) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011
Income Tax Disclosure [Abstract]
Income taxes computed at the U.S. federal statutory rate	$ 10,507	$ 1,367	$ 10,075
State income taxes	98	69	3
Research credits	(89)	757	0
Foreign losses not benefited (benefited)	0	1,377	(5,549)
Foreign Income Inclusion, net of credit	6,469	0	0
Non-deductible stock compensation	991	672	527
Non-deductible impairment charges	0	3,321	0
U.S. operating loss not benefited (benefited)	0	0	(5,123)
Valuation allowance changes	(1,334)	1,384	(28,136)
Foreign Income Inclusion, net of credit	(4,334)	(2,523)	1,020
Other	(31)	88	(155)
Total provision (benefit)	$ 12,277	$ 6,512	$ (27,338)