Earnings Per Share (Details) (USD $)	3 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Basic Earnings per Share from Continuing Operations
Income from continuing operations	$ 87,016,000	$ 77,348,000
Less: Income from continuing operations allocated to participating securities	235,000	260,000
Income from continuing operations available to common shareholders	86,781,000	77,088,000
Basic weighted average shares outstanding	90,833,000	90,359,000
Income from continuing operations per share - Basic	$ 0.96	$ 0.85
Basic Earnings per Share from Discontinued Operations
Income from discontinued operations, net of tax	0	3,117,000
Less: Income from discontinued operations allocated to participating securities	0	10,000
Income from discontinued operations available to common shareholders	0	3,107,000
Basic weighted average shares outstanding	90,833,000	90,359,000
Income from discontinued operations per share - Basic	$ 0.00	$ 0.04
Net income per share - Basic	$ 0.96	$ 0.89
Diluted Earnings per Share from Continuing Operations
Income from continuing operations available to common shareholders	86,781,000	77,088,000
Effect of dilutive stock options and other shares	1,000	2,000
Income from continuing operations available to common shareholders	86,782,000	77,090,000
Basic weighted average shares outstanding	90,833,000	90,359,000
Additional dilutive stock options and other shares	913,000	950,000
Diluted weighted average shares outstanding	91,746,000	91,309,000
Income from continuing operations per share - Diluted	$ 0.95	$ 0.85
Diluted Earnings per Share from Discontinued Operations
Income from discontinued operations available to common shareholders	0	3,107,000
Effect of dilutive stock options and other shares	0	0
Net Income Loss From Discontinued Operations Available To Common Stockholders Diluted	0	3,107,000
Basic weighted average shares outstanding	90,833,000	90,359,000
Additional dilutive stock options and other shares	913,000	950,000
Diluted weighted average shares outstanding	91,746,000	91,309,000
Income from discontinued operations per share - Diluted	$ 0.00	$ 0.03
Net income per share - Diluted	$ 0.95	$ 0.88
Earnings Per Share Diluted Other Disclosures Abstract
Anti-dilutive stock options excluded from computation of diluted earnings per share (in shares)	0	0
Share Repurchase Program - Shares Purchased	0	0
Share Repurchase Program - Amount Purchased	$ 0	$ 0