CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME (LOSS) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Income Statement [Abstract]
Revenue	$ 632,061	$ 574,970	$ 1,746,849	$ 1,635,125
Cost of goods and services	467,058	420,487	1,279,893	1,200,092
Gross profit	165,003	154,483	466,956	435,033
Selling, general and administrative expenses	113,509	117,989	357,774	343,526
Income from operations	51,494	36,494	109,182	91,507
Other income (expense)
Interest expense	(16,725)	(17,288)	(49,807)	(51,334)
Interest income	140	201	711	611
Loss from debt extinguishment, net	(1,235)	0	(7,925)	0
Other, net	806	979	2,199	3,251
Total other expense, net	(17,014)	(16,108)	(54,822)	(47,472)
Income before taxes from continuing operations	34,480	20,386	54,360	44,035
Provision for income taxes	12,649	6,258	21,022	14,664
Income from continuing operations	21,831	14,128	33,338	29,371
Discontinued operations:
Loss from operations of discontinued operations	0	0	0	(11,000)
Provision (benefit) for income taxes	0	533	0	(2,821)
Loss from discontinued operations	0	(533)	0	(8,179)
Net income	$ 21,831	$ 13,595	$ 33,338	$ 21,192
Income from continuing operations (in dollars per share)	$ 0.52	$ 0.34	$ 0.80	$ 0.72
Loss from discontinued operations (in dollars per share)	0	(0.01)	0	(0.20)
Basic earnings per common share (in dollars per share)	$ 0.52	$ 0.33	$ 0.80	$ 0.52
Basic weighted-average shares outstanding (in shares)	41,712	40,967	41,483	40,888
Income from continuing operations (in dollars per share)	$ 0.50	$ 0.33	$ 0.76	$ 0.69
Income (loss) from discontinued operations (in dollars per share)	0	(0.01)	0	(0.19)
Diluted earnings per common share (in dollars per share)	$ 0.50	$ 0.31	$ 0.76	$ 0.50
Diluted weighted-average shares outstanding (in shares)	43,774	43,164	43,818	42,649
Dividends paid per common share (in dollars per share)	$ 0.0750	$ 0.0725	$ 0.2250	$ 0.2175
Net income	$ 21,831	$ 13,595	$ 33,338	$ 21,192
Other comprehensive income (loss), net of taxes:
Foreign currency translation adjustments	9,508	(1,092)	(493)	(3,943)
Pension and other post retirement plans	1,139	184	2,480	552
Change in cash flow hedges	(1,945)	(127)	(1,278)	(214)
Total other comprehensive income (loss), net of taxes	8,702	(1,035)	709	(3,605)
Comprehensive income, net	$ 30,533	$ 12,560	$ 34,047	$ 17,587