Revenue (Narrative) (Details)	6 Months Ended
	Mar. 28, 2020 reporting_unit
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Number of reportable segments	2
Number of previous months historical warranty claims used to calculate warranty expense percentage	12 months
Minimum
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Life of warranty obligations for sales that include installation services in months	12 months
Product obligation period from date of purchase in months	12 months
Minimum | Sensors
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Operating cycle	1 month
Maximum
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Life of warranty obligations for sales that include installation services in months	24 months
Product obligation period from date of purchase in months	24 months
Maximum | Test & Simulation
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Operating cycle	12 months
Maximum | Sensors
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Operating cycle	3 months