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Earnings Per Share (Reconciliation of Net Earnings to Net Earnings Per Share Basic and Diluted) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Mar. 31, 2012	Mar. 31, 2011
Earnings Per Share
Net earnings	$ 38,751	$ 32,090	$ 67,168	$ 54,489
Basic shares outstanding	69,077	68,752	68,998	68,782
Dilutive effect of stock options	1,547	1,355	1,506	1,358
Diluted shares outstanding	70,624	70,107	70,504	70,140
Basic earnings per share	$ 0.56	$ 0.47	$ 0.97	$ 0.79
Diluted earnings per share	$ 0.55	$ 0.46	$ 0.95	$ 0.78

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