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Revenue (Disaggregation of Revenue) (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2017
Disaggregation of Revenue [Line Items]                      
Operating Leases, Income Statement, Lease Revenue                 $ 135,138    
Sales to external customers $ 412,468 $ 360,343 $ 348,628 $ 323,002 $ 366,326 $ 342,475 $ 333,690 $ 297,051 1,444,441 $ 1,339,541 $ 1,247,424
Transferred over Time [Member]                      
Disaggregation of Revenue [Line Items]                      
Sales to external customers                 563,386    
United States                      
Disaggregation of Revenue [Line Items]                      
Sales to external customers                 1,147,649    
Europe [Member]                      
Disaggregation of Revenue [Line Items]                      
Sales to external customers                 102,998    
Asia [Member]                      
Disaggregation of Revenue [Line Items]                      
Sales to external customers                 90,273    
CANADA                      
Disaggregation of Revenue [Line Items]                      
Sales to external customers                 80,083    
AUSTRALIA                      
Disaggregation of Revenue [Line Items]                      
Sales to external customers                 23,438    
Manufactured Product, Other [Member]                      
Disaggregation of Revenue [Line Items]                      
Sales to external customers                 287,775    
Service                      
Disaggregation of Revenue [Line Items]                      
Sales to external customers                 593,280 $ 537,239 $ 529,326
Applied Product Technologies                      
Disaggregation of Revenue [Line Items]                      
Sales to external customers                 533,607    
Applied Product Technologies | Transferred over Time [Member]                      
Disaggregation of Revenue [Line Items]                      
Sales to external customers                 344,097    
Applied Product Technologies | Manufactured Product, Other [Member]                      
Disaggregation of Revenue [Line Items]                      
Sales to external customers                 165,056    
Applied Product Technologies | Service                      
Disaggregation of Revenue [Line Items]                      
Sales to external customers                 24,454    
Integrated Solutions and Services                      
Disaggregation of Revenue [Line Items]                      
Sales to external customers                 910,834    
Integrated Solutions and Services | Transferred over Time [Member]                      
Disaggregation of Revenue [Line Items]                      
Sales to external customers                 219,289    
Integrated Solutions and Services | Manufactured Product, Other [Member]                      
Disaggregation of Revenue [Line Items]                      
Sales to external customers                 122,719    
Integrated Solutions and Services | Service                      
Disaggregation of Revenue [Line Items]                      
Sales to external customers                 $ 568,826