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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, 2018	Mar. 31, 2017	Mar. 31, 2018	Mar. 31, 2017
Earnings Per Share
Net earnings	$ 38,489	$ 38,105	$ 56,749	$ 84,653
Basic shares outstanding	61,401	61,310	61,323	61,436
Dilutive effect of stock options and restricted stock	2,349	2,189	2,407	2,157
Diluted shares outstanding	63,750	63,499	63,730	63,593
Basic earnings per share	$ 0.63	$ 0.62	$ 0.93	$ 1.38
Diluted earnings per share	$ 0.60	$ 0.60	$ 0.89	$ 1.33

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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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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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