CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME (LOSS) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Income Statement [Abstract]
Revenue	$ 481,370	$ 449,692	$ 1,357,490	$ 1,319,829
Cost of goods and services	255,316	230,851	730,714	691,254
Gross profit	226,054	218,841	626,776	628,575
Selling, general and administrative expenses	110,552	107,283	324,515	321,790
Goodwill and intangible asset impairments	0	243,612	0	243,612
Total operating expenses	110,552	350,895	324,515	565,402
Income (loss) from continuing operations	115,502	(132,054)	302,261	63,173
Other income (expense)
Interest expense	(21,124)	(24,068)	(64,254)	(72,763)
Interest income	1,002	90	1,243	429
Loss from debt extinguishment	(833)	0	(1,389)	0
Other, net	(2,576)	272	(5,192)	858
Total other expense, net	(23,531)	(23,706)	(69,592)	(71,476)
Income (loss) before taxes from continuing operations	91,971	(155,760)	232,669	(8,303)
Provision (benefit) for income taxes from continuing operations	25,660	(47,105)	63,849	(8,589)
Income (loss) from continuing operations	66,311	(108,655)	168,820	286
Discontinued operations:
Income (loss) from operations of discontinued operations	(6,937)	6,559	(30,464)	35,159
Provision for income taxes	7,742	18,043	3,019	27,971
Income (loss) from discontinued operations	(14,679)	(11,484)	(33,483)	7,188
Net income (loss)	$ 51,632	$ (120,139)	$ 135,337	$ 7,474
Basic earnings (loss) per common share:
Income (loss) from continuing operations (in dollars per share)	$ 1.51	$ (2.40)	$ 3.80	$ 0.01
Income (loss) from discontinued operations (in dollars per share)	(0.33)	(0.25)	(0.75)	0.16
Basic earnings (loss) per common share (in dollars per share)	$ 1.17	$ (2.65)	$ 3.05	$ 0.16
Basic weighted-average shares outstanding (in shares)	43,970	45,320	44,414	45,505
Diluted earnings (loss) per common share:
Income (loss) from continuing operations (in dollars per share)	$ 1.47	$ (2.40)	$ 3.71	$ 0.01
Income (loss) from discontinued operations (in dollars per share)	(0.33)	(0.25)	(0.74)	0.15
Diluted earnings (loss) per common share (in dollars per share)	$ 1.14	$ (2.65)	$ 2.97	$ 0.16
Diluted weighted-average shares outstanding (in shares)	45,148	45,320	45,543	46,911
Dividends paid per common share (in dollars per share)	$ 0.22	$ 0.18	$ 0.66	$ 0.54
Other comprehensive income (loss), net of taxes:
Foreign currency translation adjustments	$ 1,546	$ 12,244	$ 6,167	$ (4,804)
Pension and other post retirement plans	1,773	897	5,628	1,493
Change in cash flow hedges	1,196	(695)	(554)	475
Total other comprehensive income (loss), net of taxes	4,515	12,446	11,241	(2,836)
Comprehensive income (loss), net	$ 56,147	$ (107,693)	$ 146,578	$ 4,638