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Related Party Transactions (Details) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended		6 Months Ended
	Sep. 30, 2018	Sep. 24, 2021	Sep. 25, 2020	Sep. 24, 2021	Sep. 25, 2020	Mar. 26, 2021	Jun. 30, 2018	May 31, 2018
Related Party Transaction [Line Items]
Total net sales		$ 193,610	$ 136,649	$ 381,752	$ 251,650
Trade accounts receivable from related party		23,720		23,720		$ 23,634
Amounts due to related party		3,686		3,686		2,353
Rent expense		1,537	1,122	2,772	2,305
Related Party Revenue
Related Party Transaction [Line Items]
Total net sales		37,165	22,511	72,618	46,131
Sanken
Related Party Transaction [Line Items]
Trade accounts receivable from related party		23,720		23,720		21,595
Other accounts receivable from related party		133		$ 133		198
Option to terminate, period of notice				6 months
Rent expense		56	58	$ 112	115
Sanken | Related Party Revenue
Related Party Transaction [Line Items]
Total net sales		37,165	22,511	72,618	46,131
PSL
Related Party Transaction [Line Items]
Amounts due to related party		3,688		3,688		1,739
Purchases from related party		13,129	9,967	26,509	21,890
PSL | IC Technology Development Agreement
Related Party Transaction [Line Items]
Fees received		0	0	0	0
Fees paid		0	0	0	0
PSL | Discrete Technology Development Agreement
Related Party Transaction [Line Items]
Amounts due to related party						614
PSL | Price Support Payment
Related Party Transaction [Line Items]
Purchases from related party			1,700		3,500
Sanken Electric Europe Ltd.
Related Party Transaction [Line Items]
Trade accounts receivable from related party		0		0		$ 1,272
Director
Related Party Transaction [Line Items]
Fees paid		$ 66	$ 90	$ 122	$ 180
Monthly fee payable							$ 19	$ 30
Signing fee	$ 54
Severance payment if terminated	$ 180
Accelerated vesting, acceleration period	6 months
Director | Common Class L
Related Party Transaction [Line Items]
Shares granted (in shares)	12,000,000

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