Earnings Per Share (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 Reconciliation:
Net earnings	$ 58,226	$ 66,539	$ 202,861	$ 179,357
Weighted average basic shares	120,901	135,450	124,331	139,888
Dilutive securities:
Stock option and stock award programs (in shares)	772	709	780	746
Weighted average diluted shares	121,673	136,159	125,111	140,634
Earnings per share:
Basic	$ 0.48	$ 0.49	$ 1.63	$ 1.28
Diluted	$ 0.48	$ 0.49	$ 1.62	$ 1.28
Common stock potentially outstanding but not included in the computation of diluted earnings per share
Options to purchase shares not included in the computation of diluted earnings per share since the options were anti-dilutive (in shares)	5,200	4,800	5,200	4,800

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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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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Amount, after deduction of tax, noncontrolling interests, dividends on preferred stock and participating securities; of income (loss) available to common shareholders.

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The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

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Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

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