Accumulated Other Comprehensive Income Loss (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013
Accumulated other comprehensive income (loss)	$ (2,496)	$ (1,064)	$ (225)
Other comprehensive income (loss)	(10,449)	(1,432)	(839)
Accumulated other comprehensive income (loss)	(12,945)	(2,496)	(1,064)
Unrealized Gains (Losses) on Available-for-Sale Securities
Accumulated other comprehensive income (loss)	(26)		30
Other comprehensive income (loss)	23	(26)	(30)
Accumulated other comprehensive income (loss)	(3)	(26)
Foreign Currency Translation Adjustments
Accumulated other comprehensive income (loss)	(2,470)	(1,064)	(255)
Other comprehensive income (loss)	(10,472)	(1,406)	(809)
Accumulated other comprehensive income (loss)	$ (12,942)	$ (2,470)	$ (1,064)