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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		9 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Earnings Per Share
Net earnings	$ 49,117	$ 53,626	$ 105,866	$ 138,279
Basic shares outstanding	61,608	61,288	61,417	61,387
Dilutive effect of stock options and restricted stock	2,273	2,104	2,365	2,133
Diluted shares outstanding	63,881	63,392	63,782	63,520
Basic earnings per share	$ 0.80	$ 0.87	$ 1.72	$ 2.25
Diluted earnings per share	$ 0.77	$ 0.85	$ 1.66	$ 2.18

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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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