Revenue (Disaggregation of Revenue) (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2022	Mar. 31, 2021
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers recognized under Topic 606		$ 382,758	$ 297,919	$ 700,529	$ 583,107
Other	[1]	43,970	48,645	92,467	85,650
Revenues		426,728	346,564	792,996	668,757
United States
Disaggregation of Revenue [Line Items]
Revenue from product sales and services		352,639	274,681	647,347	538,812
Europe
Disaggregation of Revenue [Line Items]
Revenue from product sales and services		28,641	31,527	54,270	52,812
Asia
Disaggregation of Revenue [Line Items]
Revenue from product sales and services		28,042	26,976	58,947	49,581
Canada
Disaggregation of Revenue [Line Items]
Revenue from product sales and services		13,748	10,636	26,409	21,815
Australia
Disaggregation of Revenue [Line Items]
Revenue from product sales and services		3,658	2,744	6,023	5,737
Integrated Solutions and Services
Disaggregation of Revenue [Line Items]
Revenue from product sales and services		294,840	224,134	539,886
Applied Product Technologies
Disaggregation of Revenue [Line Items]
Revenue from product sales and services		131,888	122,430	253,110
Revenue from aftermarket
Disaggregation of Revenue [Line Items]
Revenue from product sales and services		97,295	60,077	158,877	112,577
Revenue from aftermarket | Integrated Solutions and Services
Disaggregation of Revenue [Line Items]
Revenue from product sales and services		62,271	32,501	91,569	59,647
Revenue from aftermarket | Applied Product Technologies
Disaggregation of Revenue [Line Items]
Revenue from product sales and services		35,024	27,576	67,308	52,930
Revenue from service
Disaggregation of Revenue [Line Items]
Revenues		166,953	144,098	320,653	286,276
Revenue from product sales and services		166,953	144,098	320,653	286,276
Revenue from service | Integrated Solutions and Services
Disaggregation of Revenue [Line Items]
Revenue from product sales and services		161,867	139,540	310,513	276,485
Revenue from service | Applied Product Technologies
Disaggregation of Revenue [Line Items]
Revenue from product sales and services		5,086	4,558	10,140	9,791
Revenue from capital projects
Disaggregation of Revenue [Line Items]
Revenue from product sales and services		162,480	142,389	313,466	269,904
Revenue from capital projects | Integrated Solutions and Services
Disaggregation of Revenue [Line Items]
Revenue from product sales and services		70,702	52,093	137,804	102,719
Revenue from capital projects | Applied Product Technologies
Disaggregation of Revenue [Line Items]
Revenue from product sales and services		$ 91,778	$ 90,296	$ 175,662	$ 167,185

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