Capital Stock (Changes in Common Shares) (Details) - shares	12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, beginning of year	213,538,144	211,179,257	212,475,880
Purchase of treasury shares	0	0	(5,721,017)
Issuance of treasury shares for stock option and award plans	1,820,969	2,358,887	4,424,394
Balance, end of year	215,359,113	213,538,144	211,179,257