CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME (LOSS) - 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]
Revenue	$ 646,792	$ 632,061	$ 1,890,915	$ 1,746,849
Cost of goods and services	476,727	467,058	1,380,362	1,279,893
Gross profit	170,065	165,003	510,553	466,956
Selling, general and administrative expenses	125,579	113,509	373,963	357,774
Income from operations	44,486	51,494	136,590	109,182
Other income (expense)
Interest expense	(15,849)	(16,725)	(47,370)	(49,807)
Interest income	50	140	399	711
Gain on sale of business	0	0	5,291	0
Loss from debt extinguishment, net	0	(1,235)	0	(7,925)
Other, net	386	806	1,192	2,199
Total other expense, net	(15,413)	(17,014)	(40,488)	(54,822)
Income before taxes	29,073	34,480	96,102	54,360
Provision for income taxes	12,366	12,649	32,783	21,022
Net income	$ 16,707	$ 21,831	$ 63,319	$ 33,338
Basic earnings per common share (in dollars per share)	$ 0.33	$ 0.52	$ 1.25	$ 0.80
Basic weighted-average shares outstanding (in shares)	50,903	41,712	50,779	41,483
Diluted earnings per common share (in dollars per share)	$ 0.31	$ 0.50	$ 1.19	$ 0.76
Diluted weighted-average shares outstanding (in shares)	53,504	43,774	53,306	43,818
Dividends paid per common share (in dollars per share)	$ 0.08	$ 0.075	$ 0.24	$ 0.225
Other comprehensive income (loss), net of taxes:
Foreign currency translation adjustments	$ 1,160	$ 9,508	$ 15,022	$ (493)
Pension and other post retirement plans	1,245	1,139	4,196	2,480
Change in cash flow hedges	351	(1,945)	1,454	(1,278)
Change in available-for-sale securities	(17)	0	(17)	0
Comprehensive income, net	19,446	30,533	83,974	34,047
Total other comprehensive income, net of taxes	$ 2,739	$ 8,702	$ 20,655	$ 709