Consolidated Statements of Earnings - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019
Income Statement [Abstract]
Net sales	$ 2,245,832	$ 2,495,665	$ 2,900,197
Costs and expenses:
Cost of goods sold	1,694,774	1,855,422	2,192,654
Selling, general and administrative expenses	186,866	217,710	211,205
Research and development costs	117,091	133,134	159,107
Impairment of assets sold		37,902
Restructuring charges	5,008	22,216
Gain on cross-currency interest rate swaps, net		(30,481)
Interest expense	34,282	35,811	44,001
Interest income	(1,495)	(1,764)	(1,413)
Other (income) expense, net	(36,493)	(56,166)	(25,969)
Total costs and expenses	2,000,033	2,213,784	2,579,585
Earnings before income taxes	245,799	281,881	320,612
Income tax expense	37,150	41,486	61,010
Net earnings	$ 208,649	$ 240,395	$ 259,602
Earnings per share:
Basic earnings per share	$ 3.30	$ 3.86	$ 4.19
Diluted earnings per share	$ 3.18	$ 3.74	$ 4.02
Weighted Average Common Shares Outstanding:
Basic	63,287	62,267	61,950
Diluted	65,555	64,209	64,498