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Supplemental Quarterly Financial Data (Unaudited) (Quarterly Financial Information) (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2015
Quarterly Financial Data |  |  |  |  |  |  |  |  |  |  |
Net sales | $ 606,788 | $ 548,622 | $ 500,381 | $ 442,894 | $ 590,922 | $ 507,664 | $ 479,382 | $ 445,110 | $ 2,098,685 | $ 2,023,078 | $ 2,038,303
Gross margin | 171,659 | 153,872 | 133,282 | 113,746 | 163,659 | 134,825 | 131,081 | 109,553 |  |  |
Earnings before income taxes | 86,765 | 68,687 | 50,236 | 47,059 | 80,756 | 63,408 | 54,366 | 27,956 | 252,747 | 226,486 | 240,949
Net Earnings: |  |  |  |  |  |  |  |  |  |  |
Net earnings | $ 62,228 | $ 53,626 | $ 38,105 | $ 46,548 | $ 63,147 | $ 51,047 | $ 40,824 | $ 25,820 | $ 200,507 | $ 180,838 | $ 181,452
Earnings per share: |  |  |  |  |  |  |  |  |  |  |
Basic earnings per share | $ 1.02 | $ 0.87 | $ 0.62 | $ 0.76 | $ 1.03 | $ 0.83 | $ 0.66 | $ 0.41 | $ 3.27 | $ 2.92 | $ 2.81
Diluted earnings per share | 0.98 | 0.85 | 0.60 | 0.73 | 0.99 | 0.81 | 0.65 | 0.40 | 3.16 | 2.85 | 2.75
Cash dividends per share | $ 0.125 | $ 0.125 | $ 0.125 | $ 0.110 | $ 0.110 | $ 0.110 | $ 0.110 | $ 0.100 | $ 0.485 | $ 0.430 | $ 0.380

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