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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, 2019	Mar. 31, 2018	Mar. 31, 2019	Mar. 31, 2018
Numerator:
Net earnings	$ 77,579	$ 38,489	$ 126,699	$ 56,749
Denominator:
Basic shares outstanding	62,175	61,401	61,995	61,323
Dilutive effect of stock options and restricted stock	2,389	2,349	2,312	2,407
Diluted shares outstanding	64,564	63,750	64,307	63,730
Income per common share:
Basic earnings per share	$ 1.25	$ 0.63	$ 2.04	$ 0.93
Diluted earnings per share	$ 1.20	$ 0.60	$ 1.97	$ 0.89

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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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