Share-Based Compensation (Details) - USD ($) $ in Thousands			3 Months Ended
		Apr. 04, 2016	Jun. 30, 2017	Jun. 30, 2016
Stock-based compensation expense [Line Items]
Allocated share-based compensation expense			$ 22,408	$ 59,579
Income tax benefit			7,428	20,888
Net income effect of share-based compensation			14,980	38,691
Share-based compensation expense previously capitalized			3,400	4,200
Inventory
Stock-based compensation expense [Line Items]
Income tax benefit			2,700	2,800
Share-based compensation expense previously capitalized				3,700
Cost of Sales
Stock-based compensation expense [Line Items]
Allocated share-based compensation expense			3,394	7,897
Research and development
Stock-based compensation expense [Line Items]
Allocated share-based compensation expense			10,289	17,517
Selling, General and Administrative
Stock-based compensation expense [Line Items]
Allocated share-based compensation expense			8,725	34,165
Atmel Corporation
Stock-based compensation expense [Line Items]
Allocated share-based compensation expense	[1]			43,200
Non cash consideration of certain share-based payment awards		$ 7,500
Accelerated compensation cost				37,100
New Accounting Pronouncement, Early Adoption, Effect | Accounting Standards Update 2016-09, Excess Tax Benefit Component
Stock-based compensation expense [Line Items]
Allocated share-based compensation expense			$ 5,900	$ 6,700

[1] During the three months ended June 30, 2017, $2.7 million of share-based compensation expense was capitalized to inventory and $3.4 million of previously capitalized share-based compensation expense in inventory was sold. During the three months ended June 30, 2016, $2.8 million of share-based compensation expense was capitalized to inventory. The amount of share-based compensation included in cost of sales during the three months ended June 30, 2016 included $3.7 million of previously capitalized share-based compensation expense in inventory that was sold and $4.2 million of share-based compensation expense related to the Company's acquisition of Atmel that was not previously capitalized to inventory.