Earnings Per Common Share (Schedule Of Earnings Per Share) (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
Earnings Per Common Share [Abstract]
Net Income, Basic	$ 65,468	$ 52,850
Shares, Basic	65,024,000	64,528,000
Per Share Amount, Basic	$ 1.01	$ 0.82
Effect of dilutive securities - Stock options, Shares	517,000	656,000
Effect of dilutive securities: Stock options, Per Share Amount	$ (0.01)	$ (0.01)
Net Income, Diluted	$ 65,468	$ 52,850
Diluted earnings per share, Shares	65,541,000	65,184,000
Per Share Amount, Diluted	$ 1.00	$ 0.81
Outstanding stock options excluded in the calculation of earnings per share	977,000	740,000