Segment and Geographic Information (Revenue By Product Segment) (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2017
Revenue	$ 1,255,631	$ 1,241,824	$ 1,164,039
Calculated under Revenue Guidance in Effect before Topic 606 [Member]
Revenue	1,311,494	1,241,824	1,164,039
Operating Segments [Member]
Revenue	1,255,631	1,241,824	1,164,039
Operating Segments [Member] | Solutions Group [Member]
Revenue	1,099,811	1,102,546	1,060,692
Operating Segments [Member] | IoT Group [Member]
Revenue	155,820	$ 139,278	$ 103,348
Operating Segments [Member] | Calculated under Revenue Guidance in Effect before Topic 606 [Member]
Revenue	1,311,494
Operating Segments [Member] | Calculated under Revenue Guidance in Effect before Topic 606 [Member] | Solutions Group [Member]
Revenue	1,135,891
Operating Segments [Member] | Calculated under Revenue Guidance in Effect before Topic 606 [Member] | IoT Group [Member]
Revenue	$ 175,603