Cash Dividends (Details) (USD $)	0 Months Ended			3 Months Ended		9 Months Ended
	Jun. 05, 2013	May 31, 2013	Mar. 06, 2013	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Cash Dividends
Cash dividends, per share (in dollars per share)	$ 0.50		$ 0.15	$ 0.50	$ 0.07	$ 0.80	$ 0.21
Cash dividend paid, per share (in dollars per share)		$ 0.15