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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 9 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Net sales $ 752,005 $ 588,117 $ 2,163,660 $ 1,606,514
Costs and expenses:        
Cost of goods sold 562,516 428,673 1,621,531 1,178,459
Selling, general and administrative expenses 52,980 54,868 159,764 141,082
Research and development costs 40,661 39,470 123,359 111,425
Restructuring charges       17,013
Interest expense 10,798 10,056 34,156 27,751
Interest income (348) (342) (1,013) (1,176)
Other (income) expense, net (6,916) 975 (18,134) (8,591)
Total costs and expenses 659,691 533,700 1,919,663 1,465,963
Earnings before income taxes 92,314 54,417 243,997 140,551
Income tax expense 26,207 5,300 51,191 34,685
Net earnings $ 66,107 49,117 $ 192,806 105,866
Accounting Standards Update 2017-07 [Member]        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Net sales   588,117   1,606,514
Costs and expenses:        
Cost of goods sold   428,673   1,178,459
Selling, general and administrative expenses   54,868   141,082
Research and development costs   39,470   111,425
Restructuring charges       17,013
Interest expense   10,056   27,751
Interest income   (342)   (1,176)
Other (income) expense, net   975   (8,591)
Total costs and expenses   533,700   1,465,963
Earnings before income taxes   54,417   140,551
Income tax expense   5,300   34,685
Net earnings   49,117   105,866
Accounting Standards Update 2017-07 [Member] | As Previously Reported [Member]        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Net sales   588,117   1,606,514
Costs and expenses:        
Cost of goods sold   427,897   1,176,012
Selling, general and administrative expenses   54,600   140,362
Research and development costs   39,470   111,425
Restructuring charges       17,013
Interest expense   7,878   21,315
Interest income   (342)   (1,176)
Other (income) expense, net   4,197   1,012
Total costs and expenses   533,700   1,465,963
Earnings before income taxes   54,417   140,551
Income tax expense   5,300   34,685
Net earnings   49,117   105,866
Accounting Standards Update 2017-07 [Member] | Adjustments [Member]        
Costs and expenses:        
Cost of goods sold   776   2,447
Selling, general and administrative expenses   268   720
Interest expense   2,178   6,436
Other (income) expense, net   $ (3,222)   $ (9,603)