Revenue (Disaggregation of Revenue) (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Disaggregation of Revenue [Line Items]
Revenue from product sales and services		$ 369,681	$ 347,827	$ 1,038,438	$ 1,045,595
Operating Leases, Income Statement, Lease Revenue	[1]	49,463	37,302	135,113	111,474
United States
Disaggregation of Revenue [Line Items]
Revenue from product sales and services		291,113	285,077	829,925	853,067
Europe
Disaggregation of Revenue [Line Items]
Revenue from product sales and services		28,749	23,413	81,561	79,906
Asia
Disaggregation of Revenue [Line Items]
Revenue from product sales and services		31,987	19,806	81,568	51,268
Canada
Disaggregation of Revenue [Line Items]
Revenue from product sales and services		14,210	16,536	36,025	50,418
Australia
Disaggregation of Revenue [Line Items]
Revenue from product sales and services		3,622	2,995	9,359	10,936
Integrated Solutions and Services
Disaggregation of Revenue [Line Items]
Revenue from product sales and services		239,687	228,711	678,538	694,734
Applied Product Technologies
Disaggregation of Revenue [Line Items]
Revenue from product sales and services		129,994	119,116	359,900	350,861
Revenue from aftermarket
Disaggregation of Revenue [Line Items]
Revenue from product sales and services		62,399	57,229	174,976	188,906
Revenue from aftermarket | Integrated Solutions and Services
Disaggregation of Revenue [Line Items]
Revenue from product sales and services		31,852	29,143	91,499	90,717
Revenue from aftermarket | Applied Product Technologies
Disaggregation of Revenue [Line Items]
Revenue from product sales and services		30,547	28,086	83,477	98,189
Revenue from service
Disaggregation of Revenue [Line Items]
Revenue from product sales and services		151,254	140,252	437,530	435,491
Revenue from service | Integrated Solutions and Services
Disaggregation of Revenue [Line Items]
Revenue from product sales and services		144,499	134,876	420,984	418,613
Revenue from service | Applied Product Technologies
Disaggregation of Revenue [Line Items]
Revenue from product sales and services		6,755	5,376	16,546	16,878
Revenue from capital projects
Disaggregation of Revenue [Line Items]
Revenue from product sales and services		156,028	150,346	425,932	421,198
Revenue from capital projects | Integrated Solutions and Services
Disaggregation of Revenue [Line Items]
Revenue from product sales and services		63,336	64,692	166,055	185,404
Revenue from capital projects | Applied Product Technologies
Disaggregation of Revenue [Line Items]
Revenue from product sales and services		92,692	85,654	259,877	235,794
Accounting Standards Update 2014-09 [Member]
Disaggregation of Revenue [Line Items]
Revenue from product sales and services		$ 320,218	$ 310,525	$ 903,325	$ 934,121

[1] Other revenue relates to revenue recognized pursuant to ASU 2016-02, Leases (Topic 842), primarily attributable to long term rentals.