Intangible Assets, by Major Class (Details) - USD ($) $ in Thousands		3 Months Ended
	Apr. 04, 2016	Jun. 30, 2017	Jun. 30, 2016	Mar. 31, 2017
Finite-Lived Intangible Assets, Net [Abstract]
Gross Amount		$ 2,703,867		$ 2,706,512
Accumulated Amortization		(677,292)		(558,420)
Net Amount		2,026,575		2,148,092
In-process technology reaching technological feasibility and reclassified		8,900
Amortization of Intangible Assets		122,800	$ 82,500
Impairment of Intangible Assets		128	1,984
Projected Amortization Expense
2018		367,731
2019		362,023
2020		313,447
2021		257,054
2022		190,017
Core and developed technology
Finite-Lived Intangible Assets, Net [Abstract]
Gross Amount		1,938,816		1,932,329
Accumulated Amortization		(474,650)		(419,468)
Net Amount		1,464,166		1,512,861
Customer-related
Finite-Lived Intangible Assets, Net [Abstract]
Gross Amount		716,945		716,945
Accumulated Amortization		(186,694)		(123,616)
Net Amount		530,251		593,329
Trademarks and trade names
Finite-Lived Intangible Assets, Net [Abstract]
Gross Amount		11,700		11,700
Accumulated Amortization		(10,152)		(9,636)
Net Amount		1,548		2,064
In-process technology
Finite-Lived Intangible Assets, Net [Abstract]
Gross Amount		29,379		38,511
Accumulated Amortization		0		0
Net Amount		29,379		38,511
Distribution rights
Finite-Lived Intangible Assets, Net [Abstract]
Gross Amount		5,578		5,578
Accumulated Amortization		(5,357)		(5,346)
Net Amount		221		232
Other
Finite-Lived Intangible Assets, Net [Abstract]
Gross Amount		1,449		1,449
Accumulated Amortization		(439)		(354)
Net Amount		$ 1,010		$ 1,095
Minimum
Finite-Lived Intangible Assets, Net [Abstract]
Useful life		1 year
Maximum
Finite-Lived Intangible Assets, Net [Abstract]
Useful life		15 years
Atmel Corporation
Finite-Lived Intangible Assets, Net [Abstract]
Useful life	9 years
Purchased intangible assets	$ 1,888,392
Atmel Corporation | Core and developed technology
Finite-Lived Intangible Assets, Net [Abstract]
Useful life	11 years
Purchased intangible assets	$ 1,074,987
Atmel Corporation | In-process technology
Finite-Lived Intangible Assets, Net [Abstract]
Purchased intangible assets	$ 140,700
Atmel Corporation | Other
Finite-Lived Intangible Assets, Net [Abstract]
Useful life	5 years
Purchased intangible assets	$ 1,805
Cost of Sales
Finite-Lived Intangible Assets, Net [Abstract]
Amortization of Intangible Assets		$ 2,000	900
Operating Expense
Finite-Lived Intangible Assets, Net [Abstract]
Amortization of Intangible Assets		$ 120,800	$ 81,600