Revenue (Disaggregation of Revenue) (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019
Disaggregation of Revenue [Line Items]
Sales to external customers	$ 1,464,429	$ 1,429,456	$ 1,444,441
Other	190,333	149,684	135,138
Transferred over Time
Disaggregation of Revenue [Line Items]
Sales to external customers	615,978	592,755	563,386
United States
Disaggregation of Revenue [Line Items]
Sales to external customers	1,174,474	1,164,634	1,147,649
Europe
Disaggregation of Revenue [Line Items]
Sales to external customers	113,559	108,139	102,998
Asia
Disaggregation of Revenue [Line Items]
Sales to external customers	113,316	77,253	90,273
CANADA
Disaggregation of Revenue [Line Items]
Sales to external customers	49,952	65,223	80,083
AUSTRALIA
Disaggregation of Revenue [Line Items]
Sales to external customers	13,128	14,207	23,438
Manufactured Product, Other [Member]
Disaggregation of Revenue [Line Items]
Sales to external customers	245,048	247,102	287,775
Service
Disaggregation of Revenue [Line Items]
Sales to external customers	603,403	589,599	593,280
Applied Product Technologies
Disaggregation of Revenue [Line Items]
Sales to external customers	504,543	485,274	533,607
Applied Product Technologies | Transferred over Time
Disaggregation of Revenue [Line Items]
Sales to external customers	365,791	335,227	344,097
Applied Product Technologies | Manufactured Product, Other [Member]
Disaggregation of Revenue [Line Items]
Sales to external customers	116,463	128,051	165,056
Applied Product Technologies | Service
Disaggregation of Revenue [Line Items]
Sales to external customers	22,289	21,996	24,454
Integrated Solutions and Services
Disaggregation of Revenue [Line Items]
Sales to external customers	959,886	944,182	910,834
Integrated Solutions and Services | Transferred over Time
Disaggregation of Revenue [Line Items]
Sales to external customers	250,187	257,528	219,289
Integrated Solutions and Services | Manufactured Product, Other [Member]
Disaggregation of Revenue [Line Items]
Sales to external customers	128,585	119,051	122,719
Integrated Solutions and Services | Service
Disaggregation of Revenue [Line Items]
Sales to external customers	581,114	567,603	568,826
Accounting Standards Update 2014-09 [Member]
Disaggregation of Revenue [Line Items]
Sales to external customers	$ 1,274,096	$ 1,279,772	$ 1,309,303