Stockholders' Equity (Details) - $ / shares			3 Months Ended
	Oct. 08, 2015	Dec. 15, 2008	Dec. 31, 2015	Sep. 30, 2015
Class of Stock [Line Items]
Common stock, par value			$ 0.01	$ 0.01
Minimum percent ownership of common stock for exercise of rights			15.00%
Series A Preferred Stock
Class of Stock [Line Items]
Common stock, par value		$ 0.01
Exercise price of rights		$ 51.60
Rights expiration period		10 years
Collective ownership threshold for joint filers	19.90%