Comprehensive Income (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]
Net income	$ 2,307	$ 3,615	$ 5,153	$ 8,170
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Change in foreign currency translation adjustment	(2,533)	202	(4,455)	971
Change in net unrealized (loss) gain on investments	(7)	(7)	80	(48)
Less income tax benefit (provision)	3	3	(31)	19
Reclassification of realized loss included in net income	0	0	12	0
Less income tax benefit	0	0	(5)	0
Comprehensive (loss) income	$ (230)	$ 3,813	$ 754	$ 9,112