CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME (LOSS) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Income Statement [Abstract]
Revenue	$ 574,970	$ 516,550	$ 1,635,125	$ 1,432,413
Cost of goods and services	420,487	377,868	1,200,092	1,051,573
Gross profit	154,483	138,682	435,033	380,840
Selling, general and administrative expenses	117,989	115,112	343,526	326,229
Income from operations	36,494	23,570	91,507	54,611
Other income (expense)
Interest expense	(17,288)	(16,328)	(51,334)	(49,973)
Interest income	201	532	611	1,491
Other, net	979	1,228	3,251	3,988
Total other expense, net	(16,108)	(14,568)	(47,472)	(44,494)
Income before taxes from continuing operations	20,386	9,002	44,035	10,117
Provision (benefit) from income taxes	6,258	1,560	14,664	(22,107)
Income from continuing operations	14,128	7,442	29,371	32,224
Discontinued operations:
Income (loss) from operations of discontinued operations	0	(200)	(11,000)	124,642
Provision (benefit) for income taxes	533	1,415	(2,821)	29,770
Income (loss) from discontinued operations	(533)	(1,615)	(8,179)	94,872
Net income	$ 13,595	$ 5,827	$ 21,192	$ 127,096
Income from continuing operations (in dollars per share)	$ 0.34	$ 0.18	$ 0.72	$ 0.78
Income (loss) from discontinued operations (in dollars per share)	(0.01)	(0.04)	(0.20)	2.30
Basic earnings per common share (in dollars per share)	$ 0.33	$ 0.14	$ 0.52	$ 3.08
Weighted-average shares outstanding (in shares)	40,967	40,295	40,888	41,232
Income from continuing operations (in dollars per share)	$ 0.33	$ 0.18	$ 0.69	$ 0.76
Income (loss) from discontinued operations (in dollars per share)	(0.01)	(0.04)	(0.19)	2.23
Diluted earnings per common share (in dollars per share)	$ 0.31	$ 0.14	$ 0.50	$ 2.98
Weighted-average shares outstanding (in shares)	43,164	41,742	42,649	42,620
Dividends paid per common share (in dollars per share)	$ 0.0725	$ 1.0700	$ 0.2175	$ 1.2100
Other comprehensive income (loss), net of taxes:
Net income	$ 13,595	$ 5,827	$ 21,192	$ 127,096
Foreign currency translation adjustments	(1,092)	(9,136)	(3,943)	9,289
Pension and other post retirement plans	184	247	552	10,053
Change in cash flow hedges	(127)	84	(214)	612
Total other comprehensive income (loss), net of taxes	(1,035)	(8,805)	(3,605)	19,954
Comprehensive income (loss), net	$ 12,560	$ (2,978)	$ 17,587	$ 147,050