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Supplemental Quarterly Financial Data (Unaudited) (Quarterly Financial Information) (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2011
Quarterly Financial Data                      
Net sales $ 558,365 $ 483,759 $ 485,513 $ 408,339 $ 528,697 $ 460,241 $ 468,793 $ 407,896 $ 1,935,976 $ 1,865,627 $ 1,711,702
Gross margin 169,249 134,277 137,413 118,766 161,706 130,790 146,301 123,486      
Earnings before income taxes 75,201 35,497 50,336 38,537 65,885 37,708 54,038 40,176 199,571 197,807 187,567
Net Earnings:                      
Net earnings $ 52,465 $ 23,663 $ 42,446 $ 27,368 $ 46,120 $ 28,302 $ 38,751 $ 28,416 $ 145,942 $ 141,589 $ 132,235
Earnings per share:                      
Basic earnings per share $ 0.77 $ 0.35 $ 0.62 $ 0.40 $ 0.67 $ 0.41 $ 0.56 $ 0.41 $ 2.13 $ 2.06 $ 1.92
Diluted earnings per share $ 0.76 $ 0.34 $ 0.61 $ 0.39 $ 0.66 $ 0.40 $ 0.55 $ 0.40 $ 2.10 $ 2.01 $ 1.89
Cash dividends per share $ 0.08 $ 0.08 $ 0.08 $ 0.08 $ 0.08 $ 0.08 $ 0.08 $ 0.07 $ 0.32 $ 0.31 $ 0.27