Income Taxes (Income Tax Reconciliation) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012
Income Tax Disclosure [Abstract]
Income taxes computed at the U.S. federal statutory rate	$ 11,595	$ 10,507	$ 1,367
State income taxes	1,057	98	69
Research credits	(41)	(89)	757
Foreign losses not benefited	0	0	1,377
Foreign income inclusion, net of credit	1,765	6,469	0
Non-deductible stock compensation	1,126	991	672
Non-deductible impairment charges	0	0	3,321
Valuation allowance changes	(815)	(1,334)	1,384
Foreign taxes	(5,371)	(4,334)	(2,523)
Other	322	(31)	88
Total provision	$ 9,638	$ 12,277	$ 6,512