Restructuring and Related Costs (Summary of Restructuring Costs) (Details) - Test & Simulation $ in Thousands	12 Months Ended
	Oct. 03, 2020 USD ($)
Restructuring Cost and Reserve [Line Items]
Restructuring expense	$ 11,848
Cost of sales
Restructuring Cost and Reserve [Line Items]
Restructuring expense	6,951
Selling and marketing
Restructuring Cost and Reserve [Line Items]
Restructuring expense	3,809
General and administrative
Restructuring Cost and Reserve [Line Items]
Restructuring expense	950
Research and development
Restructuring Cost and Reserve [Line Items]
Restructuring expense	$ 138