Earnings Per Common Share (Computation Of Basic And Diluted Earnings Per Share) (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Earnings Per Common Share [Abstract]
Net income, Basic earnings per share	$ 51,711	$ 75,285	$ 176,645	$ 198,747
Shares, Basic earnings per share	65,362,000	64,820,000	65,221,000	64,689,000
Per Share Amount, Basic earnings per share	$ 0.79	$ 1.16	$ 2.71	$ 3.07
Effect of dilutive securities: Stock options, Shares	461,000	650,000	494,000	666,000
Effect of dilutive securities: Stock options, Per Share Amount	$ 0.00	$ (0.01)	$ (0.02)	$ (0.03)
Net Income, Diluted earnings per share	$ 51,711	$ 75,285	$ 176,645	$ 198,747
Diluted earnings per share, Shares	65,823,000	65,470,000	65,715,000	65,355,000
Per Share Amount, Diluted earnings per share	$ 0.79	$ 1.15	$ 2.69	$ 3.04
Outstanding stock options, excluded in the calculation of earnings per share	672,000	684,000