Restructuring and Related Charges (Details) $ in Thousands		3 Months Ended	6 Months Ended
	Oct. 29, 2018 segment	Mar. 31, 2021 USD ($) segment	Mar. 31, 2021 USD ($) segment	Mar. 31, 2020 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
Restructuring charges			5,531	5,610
Cash payments			(4,359)	(5,831)
Restructuring Reserve, Translation and Other Adjustment			9	0
Other adjustments			283	62
Restructuring reserve, end of the period		$ 1,185	1,185	434
Write off charges			(966)	0
Cost of Product Sales and Services
Restructuring Reserve [Roll Forward]
Restructuring charges			3,428	3,765
General and Administrative Expense
Restructuring Reserve [Roll Forward]
Restructuring charges			1,089	1,760
Sales and Marketing Expense
Restructuring Reserve [Roll Forward]
Restructuring charges			340	62
Research and Development Expense
Restructuring Reserve [Roll Forward]
Restructuring charges			(16)	23
Other Operating Income (Expense)
Restructuring Reserve [Roll Forward]
Restructuring charges			690	0
Two-segment realignment
Restructuring Reserve [Roll Forward]
Restructuring charges			562	1,233
Post Memcor product line sale restructuring [Member]
Restructuring Reserve [Roll Forward]
Restructuring charges			3,808	3,659
Other Restructuring [Member]
Restructuring Reserve [Roll Forward]
Restructuring charges			1,444	$ 780
Other Restructuring [Member] | Two-segment realignment | Maximum
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost		700	700
Other Restructuring [Member] | Two-segment realignment | Minimum
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost		500	500
Other Restructuring [Member] | Post Memcor product line sale restructuring [Member] | Maximum
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost		3,000	3,000
Other Restructuring [Member] | Post Memcor product line sale restructuring [Member] | Minimum
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost		2,000	2,000
Other Restructuring [Member] | ISS restructuring [Member] | Maximum
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost		1,000	1,000
Other Restructuring [Member] | ISS restructuring [Member] | Minimum
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost		$ 500	$ 500