Accumulated Stockholders' Deficit - Accumulated other comprehensive loss (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2014
Accumulated Stockholders' Deficit
Accumulated other comprehensive loss	$ 100,051	$ 77,705
Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent			$ (578)
Foreign currency translation adjustments
Accumulated Stockholders' Deficit
Accumulated other comprehensive loss	100,100	77,700
Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent	$ 2,300	$ 2,300