Condensed Consolidated Statements of Earnings - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2020	Mar. 31, 2019
Condensed Consolidated Statements of Earnings
Net sales	$ 720,220	$ 758,844	$ 1,440,575	$ 1,411,655
Costs and expenses:
Cost of goods sold	517,514	566,841	1,052,431	1,059,015
Selling, general and administrative expenses	57,629	54,857	119,674	106,784
Research and development costs	34,661	43,831	71,507	82,698
Impairment of assets held for sale (Note 10)			37,902
Interest expense	8,756	11,480	17,765	23,358
Interest income	(476)	(294)	(963)	(665)
Other (income) expense, net (Note 18)	(5,063)	(8,039)	(26,488)	(11,218)
Total costs and expenses	613,021	668,676	1,271,828	1,259,972
Earnings before income taxes	107,199	90,168	168,747	151,683
Income tax expense	15,881	12,589	24,056	24,984
Net earnings	$ 91,318	$ 77,579	$ 144,691	$ 126,699
Earnings per share (Note 4):
Basic earnings per share	$ 1.47	$ 1.25	$ 2.33	$ 2.04
Diluted earnings per share	$ 1.41	$ 1.20	$ 2.24	$ 1.97
Weighted Average Common Shares Outstanding (Note 4):
Basic	62,266	62,175	62,128	61,995
Diluted	64,564	64,564	64,622	64,307