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Earnings Per Share (Reconciliation of Net Earnings to Net Earnings Per Share Basic and Diluted) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2016	Mar. 31, 2015
Earnings Per Share
Net earnings	$ 40,824	$ 43,855	$ 66,644	$ 87,639
Basic shares outstanding	61,639	65,159	62,351	65,242
Dilutive effect of stock options and restricted stock	1,425	1,381	1,417	1,399
Diluted shares outstanding	63,064	66,540	63,768	66,641
Basic earnings per share	$ 0.66	$ 0.67	$ 1.07	$ 1.34
Diluted earnings per share	$ 0.65	$ 0.66	$ 1.05	$ 1.32

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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