Capital Stock (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2014
Common shares as presented in the accompanying Consolidated Balance Sheets	30,364,183	30,358,864
Common shares in treasury	4,647,322	4,542,214
Board of Directors authorized an expanded stock repurchase program	$ 100.0
Stock repurchases during period, shares	120,000	517,000	350,000
Stock repurchased during period, value	$ 4.3	$ 18.2	$ 12.0