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New Accounting Standards (Schedule of Impact of Retrospectively Applying New Accounting Standards to Condensed Consolidated Statement of Earnings) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2019
Mar. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
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
Accounting Standards Update 2017-07 [Member]        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Net sales   548,249   1,018,397
Costs and expenses:        
Cost of goods sold   402,159   749,786
Selling, general and administrative expenses   39,755   86,214
Research and development costs   37,169   71,955
Restructuring charges   17,013   17,013
Interest expense   8,823   17,695
Interest income   (471)   (834)
Other expense (income), net   (4,846)   (9,566)
Total costs and expenses   499,602   932,263
Earnings before income taxes   48,647   86,134
Income tax expense   10,158   29,385
Net earnings   38,489   56,749
Accounting Standards Update 2017-07 [Member] | As Previously Reported [Member]        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Net sales   548,249   1,018,397
Costs and expenses:        
Cost of goods sold   401,331   748,115
Selling, general and administrative expenses   39,486   85,762
Research and development costs   37,169   71,955
Restructuring charges   17,013   17,013
Interest expense   6,687   13,437
Interest income   (471)   (834)
Other expense (income), net   (1,613)   (3,185)
Total costs and expenses   499,602   932,263
Earnings before income taxes   48,647   86,134
Income tax expense   10,158   29,385
Net earnings   38,489   56,749
Accounting Standards Update 2017-07 [Member] | Effect Of [Member]        
Costs and expenses:        
Cost of goods sold   828   1,671
Selling, general and administrative expenses   269   452
Interest expense   2,136   4,258
Other expense (income), net   $ (3,233)   $ (6,381)