Goodwill (Schedule of Goodwill) (Details) $ in Thousands	6 Months Ended
	Mar. 31, 2021 USD ($)
Goodwill [Roll Forward]
Goodwill, beginning of the period	$ 397,205
Business combinations and divestitures	5,988
Measurement period adjustment	(3,485)
Foreign currency translation	4,685
Goodwill, end of the period	404,393
Operating Segments | Integrated Solutions and Services
Goodwill [Roll Forward]
Goodwill, beginning of the period	224,381
Business combinations and divestitures	5,988
Measurement period adjustment	(3,485)
Foreign currency translation	2,565
Goodwill, end of the period	229,449
Operating Segments | Applied Product Technologies
Goodwill [Roll Forward]
Goodwill, beginning of the period	172,824
Measurement period adjustment	0
Foreign currency translation	2,120
Goodwill, end of the period	174,944
Goodwill, Written off Related to Sale of Business Unit	$ 0