Restructuring and Related Costs - Schedule of Restructuring Charges and Liabilities (Details) - USD ($) $ in Thousands	12 Months Ended
	Apr. 01, 2018	Apr. 02, 2017	Apr. 03, 2016
Employee Severance
Restructuring Reserve [Roll Forward]
Balance as of beginning of period	$ 4,841	$ 2,816	$ 10,512
Provision	7,847	16,409	11,632
Cash payments	(8,197)	(13,884)	(19,538)
Foreign exchange impact	148	(500)	210
Balance as of end of period	4,639	4,841	2,816
Asset Impairment Charges [Abstract]
Asset impairment	4,841	2,816	10,512
Employee Severance | High-Speed Converter Business
Restructuring Reserve [Roll Forward]
Balance as of beginning of period	1,427	1,534	10,217
Provision	0	0	0
Cash payments	(867)	(83)	(8,877)
Foreign exchange impact	66	(24)	194
Balance as of end of period	626	1,427	1,534
Asset Impairment Charges [Abstract]
Asset impairment	1,427	1,534	10,217
Facility Closing
Restructuring Reserve [Roll Forward]
Balance as of beginning of period	0
Provision	2,818
Cash payments	(537)
Balance as of end of period	2,281	0
Asset Impairment Charges [Abstract]
Asset impairment	0	0
Facility Closing | High-Speed Converter Business
Restructuring Reserve [Roll Forward]
Balance as of beginning of period	0
Provision	0
Cash payments	0
Balance as of end of period	0	0
Asset Impairment Charges [Abstract]
Asset impairment	0	0
Asset Impairment
Restructuring Reserve [Roll Forward]
Balance as of beginning of period	7,846
Balance as of end of period		7,846
Asset Impairment Charges [Abstract]
Asset impairment	7,846	7,846
Asset Impairment | High-Speed Converter Business
Restructuring Reserve [Roll Forward]
Balance as of beginning of period	0
Balance as of end of period		0
Asset Impairment Charges [Abstract]
Asset impairment	0	0
Cost of Revenues | Employee Severance
Restructuring Reserve [Roll Forward]
Balance as of beginning of period	201	307	0
Provision	416	2,605	435
Cash payments	(370)	(2,709)	(128)
Foreign exchange impact	0	(2)	0
Balance as of end of period	247	201	307
Asset Impairment Charges [Abstract]
Asset impairment	201	307	0
Cost of Revenues | Facility Closing
Restructuring Reserve [Roll Forward]
Balance as of beginning of period	0
Provision	0
Cash payments	0
Balance as of end of period	0	0
Asset Impairment Charges [Abstract]
Asset impairment	0	0
Cost of Revenues | Asset Impairment
Restructuring Reserve [Roll Forward]
Balance as of beginning of period	5,460
Balance as of end of period		5,460
Asset Impairment Charges [Abstract]
Asset impairment	5,460	5,460
Operating Expenses | Employee Severance
Restructuring Reserve [Roll Forward]
Balance as of beginning of period	3,213	975	295
Provision	7,431	13,804	11,197
Cash payments	(6,960)	(11,092)	(10,533)
Foreign exchange impact	82	(474)	16
Balance as of end of period	3,766	3,213	975
Asset Impairment Charges [Abstract]
Asset impairment	3,213	975	$ 295
Operating Expenses | Facility Closing
Restructuring Reserve [Roll Forward]
Balance as of beginning of period	0
Provision	2,818
Cash payments	(537)
Balance as of end of period	2,281	0
Asset Impairment Charges [Abstract]
Asset impairment	0	0
Operating Expenses | Asset Impairment
Restructuring Reserve [Roll Forward]
Balance as of beginning of period	2,386
Balance as of end of period		2,386
Asset Impairment Charges [Abstract]
Asset impairment	$ 2,386	$ 2,386