Cash Dividends (Details) (USD $)	0 Months Ended			3 Months Ended		6 Months Ended
	Mar. 05, 2014	Mar. 03, 2014	Dec. 03, 2013	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2014	Mar. 31, 2013
Cash Dividends
Cash dividends declared, per share (in dollars per share)	$ 0.625		$ 0.625	$ 0.625	$ 0.15	$ 1.25	$ 0.30
Cash dividend paid, per share (in dollars per share)		$ 0.625