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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
Dec. 31, 2018
Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Net sales $ 652,811 $ 470,148
Costs and expenses:    
Cost of goods sold 492,174 347,627
Selling, general and administrative expenses 51,927 46,459
Research and development costs 38,867 34,786
Interest expense 11,878 8,872
Interest income (371) (363)
Other expense (income), net (3,179) (4,720)
Total costs and expenses 591,296 432,661
Earnings before income taxes 61,515 37,487
Income tax expense 12,395 19,227
Net earnings $ 49,120 18,260
Accounting Standards Update 2017-07 [Member]    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Net sales   470,148
Costs and expenses:    
Cost of goods sold   347,627
Selling, general and administrative expenses   46,459
Research and development costs   34,786
Interest expense   8,872
Interest income   (363)
Other expense (income), net   (4,720)
Total costs and expenses   432,661
Earnings before income taxes   37,487
Income tax expense   19,227
Net earnings   18,260
Accounting Standards Update 2017-07 [Member] | As Previously Reported [Member]    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Net sales   470,148
Costs and expenses:    
Cost of goods sold   346,784
Selling, general and administrative expenses   46,276
Research and development costs   34,786
Interest expense   6,750
Interest income   (363)
Other expense (income), net   (1,572)
Total costs and expenses   432,661
Earnings before income taxes   37,487
Income tax expense   19,227
Net earnings   18,260
Accounting Standards Update 2017-07 [Member] | Effect Of [Member]    
Costs and expenses:    
Cost of goods sold   843
Selling, general and administrative expenses   183
Interest expense   2,122
Other expense (income), net   $ (3,148)