Summary of Significant Accounting Policies and Concentrations of Risk (New Accounting Policies) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Mar. 28, 2020	Dec. 28, 2019	Sep. 28, 2019	Jun. 29, 2019	Mar. 30, 2019	Dec. 29, 2018	Sep. 29, 2018	Jun. 30, 2018	Mar. 28, 2020	Mar. 30, 2019	Mar. 31, 2018	Mar. 31, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Lease assets	$ 57,819								$ 57,819			$ 50,000
Revenues	756,169	$ 723,499	$ 833,366	$ 849,632	$ 828,361	$ 800,057	$ 746,252	$ 684,370	3,162,666	$ 3,059,040	$ 2,467,023
Cost of revenues:									1,025,234	955,868	743,419
Gross margin	528,435	483,478	540,260	562,863	558,904	552,154	514,632	477,482	2,115,036	2,103,172	1,723,604
Operating expenses:
Research and development									853,589	743,027	639,750
Selling, general and administrative									432,308	398,416	362,329
Amortization of acquisition-related intangibles									8,889	4,930	2,152
Restructuring charges and executive transition costs									28,362	0	33,351
Total operating expenses									1,323,148	1,146,373	1,037,582
Operating income									791,888	956,799	686,022
Interest and other income (expense), net									42,096	11,533	5,357
Income before income taxes	189,746	165,843	215,845	262,550	259,680	256,590	239,144	212,917	833,984	968,332	691,379
Provision for income taxes									41,263	78,582	227,398
Net income	162,257	$ 162,012	$ 226,993	$ 241,459	244,640	$ 239,360	$ 215,712	$ 190,038	792,721	889,750	$ 463,981
Accounts receivable	273,028				335,165				273,028	335,165
Other assets	592,079				455,567				592,079	455,567
Other accrued liabilities	216,634				81,559				216,634	81,559
Retained earnings	$ 1,187,805				$ 1,876,969				$ 1,187,805	$ 1,876,969
Net income per common share:
Basic (in dollars per share)	$ 0.66	$ 0.65	$ 0.90	$ 0.95	$ 0.96	$ 0.95	$ 0.85	$ 0.75	$ 3.15	$ 3.52	$ 1.86
Diluted (in dollars per share)	$ 0.65	$ 0.64	$ 0.89	$ 0.94	$ 0.95	$ 0.93	$ 0.84	$ 0.74	$ 3.11	$ 3.47	$ 1.80
Shares used in per share calculations
Basic (in shares)	247,166	250,546	252,399	253,268	253,855	253,060	252,988	252,682	251,732	252,762	249,595
Diluted (in shares)	249,320	252,808	255,269	257,928	258,177	256,374	255,522	255,935	254,943	256,434	257,960
Operating Lease, Liability	$ 60,073								$ 60,073			$ 50,000