CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME (LOSS) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2024	Mar. 31, 2023
Income Statement [Abstract]
Revenue	$ 672,880	$ 710,984	$ 1,316,033	$ 1,360,368
Cost of goods and services	402,215	516,492	808,727	932,051
Gross profit	270,665	194,492	507,306	428,317
Selling, general and administrative expenses	157,217	160,301	310,020	313,021
Intangible asset impairment	0	100,000	0	100,000
Total operating expenses	157,217	260,301	310,020	413,021
Income (loss) from operations	113,448	(65,809)	197,286	15,296
Other income (expense)
Interest expense	(26,149)	(24,879)	(51,448)	(49,527)
Interest income	637	236	1,061	340
Gain on sale of building	11	0	558	10,852
Other, net	626	293	1,258	900
Total other expense, net	(24,875)	(24,350)	(48,571)	(37,435)
Income (loss) before taxes	88,573	(90,159)	148,715	(22,139)
Provision (benefit) for income taxes	24,430	(27,904)	42,395	(8,586)
Net income (loss)	$ 64,143	$ (62,255)	$ 106,320	$ (13,553)
Basic earnings (loss) per common share (in dollars per share)	$ 1.34	$ (1.17)	$ 2.20	$ (0.26)
Basic weighted-average shares outstanding (in shares)	47,946	53,038	48,365	52,809
Diluted earnings (loss) per common share (in dollars per share)	$ 1.28	$ (1.17)	$ 2.10	$ (0.26)
Diluted weighted-average shares outstanding (in shares)	49,931	53,038	50,714	52,809
Dividends paid per common share (in dollars per share)	$ 0.15	$ 0.10	$ 0.30	$ 0.20
Other comprehensive income (loss), net of taxes:
Foreign currency translation adjustments	$ (7,199)	$ 334	$ 3,039	$ 12,271
Pension and other post retirement plans	531	746	1,063	1,608
Change in cash flow hedges	1,772	1,533	1,477	953
Total other comprehensive income (loss), net of taxes	(4,896)	2,613	5,579	14,832
Comprehensive income (loss), net	$ 59,247	$ (59,642)	$ 111,899	$ 1,279