Share-Based Compensation (Schedule Of Stock Options Awarded Under The Option Plans) (Details) (USD $) In Millions, except Share data, unless otherwise specified	6 Months Ended
	Mar. 31, 2012 Y
Share-Based Compensation [Abstract]
Stock options Outstanding at October 1, 2011, Shares	435,054
Stock options Granted, Shares
Stock options Exercised, Shares	(94,136)
Stock options Cancelled / Expired, Shares	(202,616)
Stock options Outstanding at March 31, 2012, Shares	138,302
Stock options Exercisable at March 31, 2012, Shares	137,635
Stock options Outstanding at October 1, 2011, Weighted Avg. Price	$ 35.58
Stock options Granted, Weighted Avg. Price
Stock options Exercised, Weighted Avg. Price	$ 14.66
Stock options Cancelled / Expired, Weighted Avg. Price	$ 45.33
Stock options Outstanding at March 31, 2012, Weighted Avg. Price	$ 35.63
Stock options Exercisable at March 31, 2012, Weighted Avg. Price	$ 35.65
Stock options Exercised, Aggregate Intrinsic Value	$ 1.9
Stock options Outstanding at March 31, 2012, Aggregate Intrinsic Value	0.3
Stock options Exercisable at March 31, 2012, Aggregate Intrinsic Value	$ 0.3
Stock options Outstanding at March 31, 2012, Weighted Avg. Remaining Contractual Life, Years	1.3