Restructuring - Narrative (Details) $ in Thousands	3 Months Ended	6 Months Ended	12 Months Ended
	Sep. 30, 2018 USD ($) employee	Sep. 30, 2018 USD ($)	Apr. 01, 2018 USD ($) employee	Apr. 02, 2017 USD ($)
Restructuring Cost and Reserve [Line Items]
Payments for early termination fees	$ 1,500
Accrual related to the early termination fees of leases	200	$ 200
GigPeak Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Lease obligation changes			$ 2,800
Employee severance
Restructuring Cost and Reserve [Line Items]
Restructuring charges		1,891
Payments for restructuring actions		4,188
Accrued balance for employee severance costs	$ 2,340	2,340	$ 4,637
Employee severance | GigPeak Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Number of reduced headcount (employees) | employee			46
Restructuring charges			$ 2,700
Payments for restructuring actions		600		$ 2,100
Employee severance | Other Restructuring Plan - 2018 Restructuring
Restructuring Cost and Reserve [Line Items]
Number of reduced headcount (employees) | employee	18		63
Restructuring charges	$ 1,400	500	$ 5,100
Payments for restructuring actions		3,300	2,300
Accrued severance costs	1,400	1,400
Employee severance | Workforce-Reduction Plan
Restructuring Cost and Reserve [Line Items]
Payments for restructuring actions	500
Accrued balance for employee severance costs	300	300	800
Employee severance | Other Restructuring Plan, 2015 Restructuring | High-Speed Converter Business
Restructuring Cost and Reserve [Line Items]
Accrued balance for employee severance costs	600	600	600
Facility Closing
Restructuring Cost and Reserve [Line Items]
Restructuring charges		315
Payments for restructuring actions		2,113
Accrued balance for employee severance costs	483	483	$ 2,281
Facility Closing | Other Restructuring Plan - 2018 Restructuring
Restructuring Cost and Reserve [Line Items]
Accrued balance for employee severance costs	$ 300	$ 300