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Fair Value Measurements (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Oct. 03, 2020	Oct. 03, 2020	Sep. 28, 2019	Sep. 29, 2018
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Goodwill impairment		$ 241,518
Impairment of assets		$ 291,389	$ 0	$ 0
Trade names
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Impairment of indefinite-lived intangible assets	$ 13,400
Legacy Test
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Goodwill impairment	22,509
E2M Technologies B.V.
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Goodwill impairment	30,835
PCB
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Goodwill impairment	188,174
Test & Simulation
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Impairment charges of amortizing intangible assets	$ 36,471