CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME (LOSS) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Income Statement [Abstract]
Revenue	$ 609,291	$ 548,438
Cost of goods and services	439,119	398,517
Gross profit	170,172	149,921
Selling, general and administrative expenses	121,557	117,798
Income from operations	48,615	32,123
Other income (expense)
Interest expense	(15,690)	(16,211)
Interest income	45	261
Gain on sale of business	6,240	0
Other, net	(41)	778
Total other expense, net	(9,446)	(15,172)
Income before taxes	39,169	16,951
Provision for income taxes	9,669	6,339
Net income	$ 29,500	$ 10,612
Basic earnings per common share (in dollars per share)	$ 0.58	$ 0.26
Basic weighted-average shares outstanding (in shares)	50,596	41,173
Diluted earnings per common share (in dollars per share)	$ 0.55	$ 0.24
Diluted weighted-average shares outstanding (in shares)	53,192	43,895
Dividends paid per common share (in dollars per share)	$ 0.08	$ 0.075
Other comprehensive income (loss), net of taxes:
Foreign currency translation adjustments	$ 12,123	$ 6,470
Pension and other post retirement plans	1,706	672
Change in cash flow hedges	(688)	(301)
Total other comprehensive income (loss), net of taxes	13,141	6,841
Comprehensive income, net	$ 42,641	$ 17,453