Goodwill (Schedule of Goodwill) (Details) $ in Thousands	9 Months Ended
	Jun. 30, 2020 USD ($)
Goodwill [Roll Forward]
Goodwill, beginning of the period	$ 392,890
Business combinations and divestitures	1,393
Measurement period adjustment	298
Foreign currency translation	(1,154)
Goodwill, end of the period	393,427
Operating Segments | Integrated Solutions and Services
Goodwill [Roll Forward]
Goodwill, beginning of the period	222,013
Business combinations and divestitures	1,798
Measurement period adjustment	0
Foreign currency translation	(1,142)
Goodwill, end of the period	222,669
Operating Segments | Applied Product Technologies
Goodwill [Roll Forward]
Goodwill, beginning of the period	170,877
Business combinations and divestitures	(405)
Measurement period adjustment	298
Foreign currency translation	(12)
Goodwill, end of the period	$ 170,758