CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME (LOSS) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2019	Mar. 31, 2018
Income Statement [Abstract]
Revenue	$ 549,633	$ 478,560	$ 1,060,155	$ 915,863
Cost of goods and services	412,129	357,181	779,605	673,705
Gross profit	137,504	121,379	280,550	242,158
Selling, general and administrative expenses	111,783	104,493	225,537	211,117
Income from operations	25,721	16,886	55,013	31,041
Other income (expense)
Interest expense	(17,517)	(16,806)	(34,046)	(33,645)
Interest income	212	762	410	959
Other, net	1,268	2,346	2,272	2,760
Total other expense, net	(16,037)	(13,698)	(31,364)	(29,926)
Income before taxes from continuing operations	9,684	3,188	23,649	1,115
Provision (benefit) from income taxes	3,194	1,237	8,406	(23,667)
Income from continuing operations	6,490	1,951	15,243	24,782
Discontinued operations:
Income (loss) from operations of discontinued operations	(11,000)	113,376	(11,000)	124,842
Provision (benefit) for income taxes	(3,354)	25,047	(3,354)	28,355
Income (loss) from discontinued operations	(7,646)	88,329	(7,646)	96,487
Net income (loss)	$ (1,156)	$ 90,280	$ 7,597	$ 121,269
Income from continuing operations (in dollars per share)	$ 0.16	$ 0.05	$ 0.37	$ 0.59
Income (loss) from discontinued operations (in dollars per share)	(0.19)	2.13	(0.19)	2.31
Basic earnings per common share (in dollars per share)	$ (0.03)	$ 2.18	$ 0.19	$ 2.91
Weighted-average shares outstanding (in shares)	40,949	41,477	40,849	41,700
Income from continuing operations (in dollars per share)	$ 0.15	$ 0.05	$ 0.36	$ 0.58
Income (loss) from discontinued operations (in dollars per share)	(0.18)	2.07	(0.18)	2.24
Diluted earnings per common share (in dollars per share)	$ (0.03)	$ 2.11	$ 0.18	$ 2.82
Weighted-average shares outstanding (in shares)	42,832	42,765	42,376	43,062
Dividends paid per common share (in dollars per share)	$ 0.0725	$ 0.0700	$ 0.145	$ 0.1400
Other comprehensive income (loss), net of taxes:
Net income (loss)	$ (1,156)	$ 90,280	$ 7,597	$ 121,269
Foreign currency translation adjustments	2,885	19,714	(2,851)	18,425
Pension and other post retirement plans	184	247	368	9,806
Change in cash flow hedges	(189)	440	(87)	528
Total other comprehensive income (loss), net of taxes	2,880	20,401	(2,570)	28,759
Comprehensive income, net	$ 1,724	$ 110,681	$ 5,027	$ 150,028