Capital Stock (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2017
Common shares as presented in the accompanying Consolidated Balance Sheets	30,364,183		30,468,824
Common shares in treasury	4,647,322		4,635,622
Board of Directors authorized an expanded stock repurchase program			$ 100.0
Stock repurchases during period, shares	120,000	517,000
Stock repurchased during period, value	$ 4.3	$ 18.2