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Revenue from Contract with Customers - Net Sales by Product (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 25, 2022	Mar. 26, 2021	Mar. 27, 2020
Disaggregation of Revenue [Line Items]
Total net sales	$ 768,674	$ 591,207	$ 650,089
Power integrated circuits (“PIC”)
Disaggregation of Revenue [Line Items]
Total net sales	268,381	203,600	165,911
Magnetic sensors (“MS”)
Disaggregation of Revenue [Line Items]
Total net sales	498,561	386,372	376,387
Photonics
Disaggregation of Revenue [Line Items]
Total net sales	1,732	1,235	0
Wafer foundry products
Disaggregation of Revenue [Line Items]
Total net sales	0	0	72,370
Distribution of Sanken products
Disaggregation of Revenue [Line Items]
Total net sales	$ 0	$ 0	$ 35,421

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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