Fair Value Measurements (Changes in Fair Value of Level 3 Contingent Consideration Liability (Details) - USD ($) $ in Thousands	9 Months Ended
	Jun. 30, 2018	Jul. 01, 2017
Business Combination. Contingent Consideration [Roll Forward]
Beginning balance	$ 8,400
Payment of contingent consideration	(8,400)	$ (12,100)
Ending balance	2,100
Level 3
Business Combination. Contingent Consideration [Roll Forward]
Beginning balance	8,400	19,570
Addition to contingent consideration	2,100
Change in present value of contingent consideration		392
Payment of contingent consideration	(8,400)	(12,100)
Ending balance	2,100	7,862
Kepware
Business Combination. Contingent Consideration [Roll Forward]
Ending balance	0
Kepware | Level 3
Business Combination. Contingent Consideration [Roll Forward]
Beginning balance	8,400	17,070
Addition to contingent consideration	0
Change in present value of contingent consideration		392
Payment of contingent consideration	(8,400)	(9,600)
Ending balance	0	7,862
Other | Level 3
Business Combination. Contingent Consideration [Roll Forward]
Beginning balance	0
Addition to contingent consideration	2,100
Payment of contingent consideration	0
Ending balance	$ 2,100
ColdLight | Level 3
Business Combination. Contingent Consideration [Roll Forward]
Beginning balance		2,500
Change in present value of contingent consideration		0
Payment of contingent consideration		(2,500)
Ending balance		$ 0