Revenue from Contract with Customers - Net Sales by Product (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 24, 2021	Dec. 25, 2020	Dec. 24, 2021	Dec. 25, 2020
Disaggregation of Revenue [Line Items]
Total net sales	$ 186,629	$ 164,449	$ 568,381	$ 416,099
Power integrated circuits
Disaggregation of Revenue [Line Items]
Total net sales	62,859	54,406	195,054	146,276
Magnetic sensors
Disaggregation of Revenue [Line Items]
Total net sales	123,543	109,457	371,806	268,956
Photonics
Disaggregation of Revenue [Line Items]
Total net sales	$ 227	$ 586	$ 1,521	$ 867