Schedule II - Valuation and Qualifying Accounts, Supplementary Financial Data Quarterly Data (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
Supplementary Financial Data [Abstract]
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
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
Income before provision for taxes	189,746	165,843	215,845	262,550	259,680	256,590	239,144	212,917	833,984	968,332	691,379
Net income	$ 162,257	$ 162,012	$ 226,993	$ 241,459	$ 244,640	$ 239,360	$ 215,712	$ 190,038	$ 792,721	$ 889,750	$ 463,981
Shares used in per share calculations
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
Cash dividends per common share (in dollars per share)	$ 0.37	$ 0.37	$ 0.37	$ 0.37		$ 0.36	$ 0.36	$ 0.36