Revenue (Disaggregation of Revenue) (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Disaggregation of Revenue [Line Items]
Revenue from product sales and services		$ 347,827	$ 360,343	$ 1,045,595	$ 1,031,973
Operating Leases, Income Statement, Lease Revenue	[1]	37,302	35,334	111,474	97,862
United States
Disaggregation of Revenue [Line Items]
Revenue from product sales and services		285,077	284,737	853,067	823,923
Europe
Disaggregation of Revenue [Line Items]
Revenue from product sales and services		23,413	26,677	79,906	71,235
Asia
Disaggregation of Revenue [Line Items]
Revenue from product sales and services		19,806	23,007	51,268	62,411
Canada
Disaggregation of Revenue [Line Items]
Revenue from product sales and services		16,536	20,873	50,418	58,836
Australia
Disaggregation of Revenue [Line Items]
Revenue from product sales and services		2,995	5,049	10,936	15,568
Integrated Solutions and Services
Disaggregation of Revenue [Line Items]
Revenue from product sales and services		228,711	225,429	694,734
Applied Product Technologies
Disaggregation of Revenue [Line Items]
Revenue from product sales and services		119,116	134,914	350,861
Revenue from aftermarket
Disaggregation of Revenue [Line Items]
Revenue from product sales and services		57,229	74,841	188,906	213,660
Revenue from aftermarket | Integrated Solutions and Services
Disaggregation of Revenue [Line Items]
Revenue from product sales and services		29,143	29,968	90,717	93,238
Revenue from aftermarket | Applied Product Technologies
Disaggregation of Revenue [Line Items]
Revenue from product sales and services		28,086	44,873	98,189	120,422
Revenue from service
Disaggregation of Revenue [Line Items]
Revenue from product sales and services		140,252	149,980	435,491	434,654
Revenue from service | Integrated Solutions and Services
Disaggregation of Revenue [Line Items]
Revenue from product sales and services		134,876	143,329	418,613	416,781
Revenue from service | Applied Product Technologies
Disaggregation of Revenue [Line Items]
Revenue from product sales and services		5,376	6,651	16,878	17,873
Revenue from capital projects
Disaggregation of Revenue [Line Items]
Revenue from product sales and services		150,346	135,522	421,198	383,659
Revenue from capital projects | Integrated Solutions and Services
Disaggregation of Revenue [Line Items]
Revenue from product sales and services		64,692	52,132	185,404	152,772
Revenue from capital projects | Applied Product Technologies
Disaggregation of Revenue [Line Items]
Revenue from product sales and services		85,654	83,390	235,794	230,887
Accounting Standards Update 2014-09 [Member]
Disaggregation of Revenue [Line Items]
Revenue from product sales and services		$ 310,525	$ 325,009	$ 934,121	$ 934,111

[1] Other revenue relates to revenue recognized from Topic 842 (previously Topic 840), Leases, mainly attributable to long term rentals.