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
Dec. 31, 2021	Dec. 31, 2020
Numerator:
Net earnings	$ 30,305	$ 41,570
Denominator:
Basic	63,094	62,812
Dilutive effect of stock options and restricted stock	2,005	2,080
Diluted shares outstanding	65,099	64,892
Income per common share:
Basic earnings per share	$ 0.48	$ 0.66
Diluted earnings per share	$ 0.47	$ 0.64

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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- Definition

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

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