Restructuring and Related Charges (Details) $ in Thousands		3 Months Ended	12 Months Ended
	Oct. 29, 2018 segment	Sep. 30, 2021 USD ($) segment	Sep. 30, 2021 USD ($) segment	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)
Restructuring Cost and Reserve [Line Items]
Number of reportable segments | segment	3	2	2
Restructuring Reserve [Roll Forward]
Restructuring reserve, beginning of the period			$ 970	$ 655	$ 710
Restructuring charges related to two-segment realignment			9,149	12,135	12,993
Release of prior reserves			(329)	(98)	(541)
Write-off charges			(1,340)	(2,461)	0
Cash payments			(8,484)	(9,367)	(12,966)
Restructuring Reserve, Translation and Other Adjustment			9	8	(82)
Restructuring reserve, end of the period		$ 304	304	970	655
Post Memcor product line sale
Restructuring Reserve [Roll Forward]
Restructuring charges related to two-segment realignment			5,588	8,274	0
Two-segment realignment
Restructuring Reserve [Roll Forward]
Restructuring charges related to two-segment realignment			1,060	2,092	11,090
Other Restructuring
Restructuring Reserve [Roll Forward]
Restructuring charges related to two-segment realignment			2,830	$ 1,867	$ 2,444
Other Restructuring | Two-segment realignment
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost		500	500
Other Restructuring | Minimum | Integrated Solutions and Services
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost		600	600
Other Restructuring | Minimum | Post Memcor product line sale
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost		400	400
Other Restructuring | Maximum | Integrated Solutions and Services
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost		1,000	1,000
Other Restructuring | Maximum | Post Memcor product line sale
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost		$ 1,400	$ 1,400