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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
Dec. 31, 2018
Dec. 31, 2017
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
Earnings Per Share    
Basic earnings per share $ 0.79 $ 0.30
Diluted earnings per share $ 0.77 $ 0.29
Weighted Average Common Shares Outstanding (Note 4):    
Basic 61,818 61,246
Diluted 64,059 63,709
Under Previous Standard [Member]    
Net sales $ 632,641  
Costs and expenses:    
Cost of goods sold 468,690  
Selling, general and administrative expenses 52,026  
Research and development costs 38,714  
Interest expense 11,878  
Interest income (371)  
Other expense (income), net (3,179)  
Total costs and expenses 567,758  
Earnings before income taxes 64,883  
Income tax expense 13,083  
Net earnings $ 51,800  
Earnings Per Share    
Basic earnings per share $ 0.84  
Diluted earnings per share $ 0.81  
Weighted Average Common Shares Outstanding (Note 4):    
Basic 61,818  
Diluted 64,059  
Effect Of [Member] | ASC 606 [Member]    
Net sales $ 20,170  
Costs and expenses:    
Cost of goods sold 23,484  
Selling, general and administrative expenses (99)  
Research and development costs 153  
Total costs and expenses 23,538  
Earnings before income taxes (3,368)  
Income tax expense (688)  
Net earnings $ (2,680)  
Earnings Per Share    
Basic earnings per share $ (0.04)  
Diluted earnings per share $ (0.04)