Fair Value Measurements (Changes in Fair Value of Level 3 Contingent Consideration Liability (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 29, 2018	Dec. 30, 2017
Business Combination. Contingent Consideration [Roll Forward]
Beginning balance	$ 1,575
Payment of contingent consideration	(1,600)	$ (3,800)
Ending balance	0
Level 3
Business Combination. Contingent Consideration [Roll Forward]
Beginning balance	1,575
Ending balance	0
Kepware | Level 3
Business Combination. Contingent Consideration [Roll Forward]
Beginning balance		8,400
Payment of contingent consideration		(3,757)
Ending balance		$ 4,643
Other | Level 3
Business Combination. Contingent Consideration [Roll Forward]
Beginning balance	1,575
Payment of contingent consideration	(1,575)
Ending balance	$ 0