Condensed Consolidated Statements of Earnings - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Income Statement [Abstract]
Net sales	$ 556,675	$ 523,826	$ 1,675,615	$ 1,964,401
Costs and expenses:
Cost of goods sold	422,457	395,511	1,258,340	1,447,942
Selling, general and administrative expenses	48,021	57,361	148,461	177,035
Research and development costs	29,765	34,522	89,388	106,029
Impairment of assets sold				37,902
Restructuring charges		19,040		19,040
Gain on cross-currency interest rate swaps, net		(30,481)		(30,481)
Interest expense	8,397	8,737	25,552	26,502
Interest income	(308)	(377)	(1,086)	(1,340)
Other (income) expense, net	(10,355)	(5,503)	(29,809)	(31,991)
Total costs and expenses	497,977	478,810	1,490,846	1,750,638
Earnings before income taxes	58,698	45,016	184,769	213,763
Income tax expense	9,837	6,551	26,025	30,607
Net earnings	$ 48,861	$ 38,465	$ 158,744	$ 183,156
Earnings per share:
Basic earnings per share	$ 0.77	$ 0.62	$ 2.51	$ 2.95
Diluted earnings per share	$ 0.74	$ 0.61	$ 2.42	$ 2.85
Weighted Average Common Shares Outstanding:
Basic	63,559	62,309	63,215	62,188
Diluted	65,910	63,427	65,499	64,273