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Revenue (Schedule of Impact of the Adoption ASC 606 on Condensed Consolidated Earning) (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2019
Mar. 31, 2018
Net sales $ 758,844 $ 548,249 $ 1,411,655 $ 1,018,397
Costs and expenses:        
Cost of goods sold 566,841 402,159 1,059,015 749,786
Selling, general and administrative expenses 54,857 39,755 106,784 86,214
Research and development costs 43,831 37,169 82,698 71,955
Restructuring charges   17,013   17,013
Interest expense 11,480 8,823 23,358 17,695
Interest income (294) (471) (665) (834)
Other expense (income), net (8,039) (4,846) (11,218) (9,566)
Total costs and expenses 668,676 499,602 1,259,972 932,263
Earnings before income taxes 90,168 48,647 151,683 86,134
Income tax expense 12,589 10,158 24,984 29,385
Net earnings $ 77,579 $ 38,489 $ 126,699 $ 56,749
Earnings Per Share        
Basic earnings per share $ 1.25 $ 0.63 $ 2.04 $ 0.93
Diluted earnings per share $ 1.20 $ 0.60 $ 1.97 $ 0.89
Weighted Average Common Shares Outstanding (Note 4):        
Basic 62,175 61,401 61,995 61,323
Diluted 64,564 63,750 64,307 63,730
ASC 606 [Member] | Under Previous Standard [Member]        
Net sales $ 723,227   $ 1,355,868  
Costs and expenses:        
Cost of goods sold 539,364   1,008,054  
Selling, general and administrative expenses 54,979   107,005  
Research and development costs 45,637   84,351  
Interest expense 11,480   23,358  
Interest income (294)   (665)  
Other expense (income), net (8,039)   (11,218)  
Total costs and expenses 643,127   1,210,885  
Earnings before income taxes 80,100   144,983  
Income tax expense 10,472   23,555  
Net earnings $ 69,628   $ 121,428  
Earnings Per Share        
Basic earnings per share $ 1.12   $ 1.96  
Diluted earnings per share $ 1.08   $ 1.89  
Weighted Average Common Shares Outstanding (Note 4):        
Basic 62,175   61,995  
Diluted 64,564   64,307  
Effect Of [Member] | ASC 606 [Member]        
Net sales $ 35,617   $ 55,787  
Costs and expenses:        
Cost of goods sold 27,477   50,961  
Selling, general and administrative expenses (122)   (221)  
Research and development costs (1,806)   (1,653)  
Total costs and expenses 25,549   49,087  
Earnings before income taxes 10,068   6,700  
Income tax expense 2,117   1,429  
Net earnings $ 7,951   $ 5,271  
Earnings Per Share        
Basic earnings per share $ 0.13   $ 0.08  
Diluted earnings per share $ 0.12   $ 0.08