Goodwill and Intangible Assets, Net - Intangible Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Apr. 02, 2017
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Assets	$ 575,725	$ 456,868
Accumulated Amortization	(378,748)	(348,050)
Net Assets	196,977	108,818
Developed technology
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Assets	336,402	262,184
Accumulated Amortization	(217,529)	(199,851)
Net Assets	118,873	62,333
Trademarks
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Assets	5,391	5,391
Accumulated Amortization	(5,391)	(5,347)
Net Assets	0	44
Customer relationships
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Assets	201,998	173,097
Accumulated Amortization	(146,374)	(137,239)
Net Assets	55,624	35,858
Intellectual property licenses
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Assets	14,886	16,196
Accumulated Amortization	(6,452)	(5,613)
Net Assets	8,434	$ 10,583
Software licenses
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Assets	7,831
Accumulated Amortization	(2,852)
Net Assets	4,979
Order backlog
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Assets	200
Accumulated Amortization	(150)
Net Assets	50
Total amortizable purchased intangible assets
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Assets	566,708
Accumulated Amortization	(378,748)
Net Assets	187,960
In-process research and development (IPR&D)
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Assets	9,017
Accumulated Amortization	0
Net Assets	$ 9,017