Dividend (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended		9 Months Ended
	Aug. 06, 2015	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Common stock dividend
Cash dividend (in dollars per share)		$ 0.22
Dividend paid (in dollars)		$ 2,738		$ 8,214	$ 8,174
Cash dividend declared (in dollars per share)	$ 0.22	$ 0.22	$ 0.22	$ 0.66	$ 0.66