Business Acquisition Narrative (Details) - USD ($) $ in Thousands						3 Months Ended		6 Months Ended		12 Months Ended
	Oct. 01, 2020	Feb. 21, 2020	Feb. 06, 2020	Oct. 04, 2019	May 06, 2019	Oct. 03, 2020	Sep. 28, 2019	Oct. 03, 2020	Sep. 28, 2019	Mar. 28, 2020
Business Acquisition [Line Items]
Goodwill, Period Increase (Decrease)								$ (1,459)
Payments to Acquire Businesses, Net of Cash Acquired								47,520	$ 299,673
Intangible assets amortization						$ 72,400	$ 56,400	144,470	114,837
Goodwill						2,639,943		2,639,943		$ 2,614,274
7Hugs [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net	$ (5,400)
Business Combination, Consideration Transferred	48,700
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents	1,000
Goodwill	18,500
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities	(1,700)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill	$ 37,300
7Hugs [Member] | Other operating expense
Business Acquisition [Line Items]
Business Combination, Integration Related Costs						1,400
Custom MMIC [Member]
Business Acquisition [Line Items]
Payments to Acquire Businesses, Gross			$ 86,000
Business Combination, Contingent Consideration, Liability, Current						10,000		10,000
Business Combination, Consideration Transferred			$ 91,700
Cavendish [Member]
Business Acquisition [Line Items]
Payments to Acquire Businesses, Gross				$ 198,400
Finite-Lived Intangible Assets, Period Increase (Decrease)								(2,000)
Business Combination, Step Acquisition, Equity Interest in Acquiree, Fair Value				$ 102,400
Cavendish [Member] | Other Income [Member]
Business Acquisition [Line Items]
Business Combination, Step Acquisition, Equity Interest in Acquiree, Remeasurement Gain										43,000
Active-Semi
Business Acquisition [Line Items]
Business Combination, Consideration Transferred					$ 307,900
Decawave [Member]
Business Acquisition [Line Items]
Business Combination, Consideration Transferred		$ 372,700
Developed Technology | 7Hugs [Member]
Business Acquisition [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	10 years
Infrastructure and Defense Products
Business Acquisition [Line Items]
Goodwill, Period Increase (Decrease)								(508)
Goodwill						608,334		608,334		608,842
Infrastructure and Defense Products | Custom MMIC [Member]
Business Acquisition [Line Items]
Goodwill, Period Increase (Decrease)								(600)
Infrastructure and Defense Products | Active-Semi
Business Acquisition [Line Items]
Goodwill, Period Increase (Decrease)								100
Mobile Products
Business Acquisition [Line Items]
Goodwill, Period Increase (Decrease)								(951)
Goodwill						2,031,609		2,031,609		$ 2,005,432
Mobile Products | Cavendish [Member]
Business Acquisition [Line Items]
Goodwill, Period Increase (Decrease)								1,600
Mobile Products | Decawave [Member]
Business Acquisition [Line Items]
Goodwill, Period Increase (Decrease)								(2,600)
Cavendish [Member]
Business Acquisition [Line Items]
Equity Method Investments							$ 59,400		$ 59,400
Maximum [Member] | Custom MMIC [Member]
Business Acquisition [Line Items]
Business Combination, Contingent Consideration, Liability, Current						$ 10,000		$ 10,000