CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME (LOSS) - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2020
Income Statement [Abstract]
Revenue	$ 2,848,488	$ 2,270,626	$ 2,066,546
Cost of goods and services	1,911,602	1,629,513	1,482,552
Gross profit	936,886	641,113	583,994
Selling, general and administrative expenses	608,926	470,530	444,454
Goodwill and intangible asset impairments	517,027	0	0
Total operating expenses	1,125,953	470,530	444,454
Income (loss) from continuing operations	(189,067)	170,583	139,540
Other income (expense)
Interest expense	(84,379)	(63,175)	(66,544)
Interest income	215	440	749
Debt extinguishment, net	(4,529)	0	(7,925)
Other, net	6,881	2,107	1,661
Total other income (expense)	(81,812)	(60,628)	(72,059)
Income (loss) before taxes from continuing operations	(270,879)	109,955	67,481
Provision for income taxes	16,836	39,653	26,037
Income (loss) from continuing operations	(287,715)	70,302	41,444
Discontinued operations:
Income before tax from discontinued operations	116,345	10,121	15,276
Provision for income taxes	20,188	1,212	3,291
Income from discontinued operations	96,157	8,909	11,985
Net income (loss)	$ (191,558)	$ 79,211	$ 53,429
Basic earnings (loss) per common share:
Income (loss) from continuing operations (in usd per share)	$ (5.57)	$ 1.38	$ 0.97
Income (loss) from discontinued operations (in usd per share)	1.86	0.18	0.28
Basic earnings (loss) per common share (in usd per share)	$ (3.71)	$ 1.56	$ 1.25
Weighted-average shares outstanding (in shares)	51,672	50,830	42,588
Diluted earnings (loss) per common share:
Income (loss) from continuing operations (in usd per share)	$ (5.57)	$ 1.32	$ 0.92
Income (loss) from discontinued operations (in usd per share)	1.86	0.17	0.27
Diluted earnings (loss) per common share (in usd per share)	$ (3.71)	$ 1.48	$ 1.19
Weighted-average shares outstanding (in shares)	51,672	53,369	45,015
Other comprehensive income (loss), net of taxes:
Foreign currency translation adjustments	$ (37,920)	$ 6,433	$ 5,601
Pension and other post retirement plans	1,503	17,796	(11,784)
Gain (loss) on cash flow hedge	(344)	1,886	7
Total other comprehensive income (loss), net of taxes	(36,761)	26,115	(6,176)
Comprehensive income (loss)	$ (228,319)	$ 105,326	$ 47,253