Capital Stock (Preferred Stock Narrative) (Details) - $ / shares	Sep. 30, 2017	Sep. 30, 2016
Class of Stock [Line Items]
Preferred stock, shares authorized	25,000,000
Perferred stock, par value (in dollars per share)	$ 1
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Series A Junior Participating Preferred Stock
Class of Stock [Line Items]
Preferred stock, shares authorized	2,500,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0