Related Party Transactions (Details) - USD ($)			1 Months Ended	3 Months Ended		9 Months Ended
	Jan. 01, 2023	Dec. 02, 2021	Sep. 30, 2018	Dec. 24, 2021	Dec. 25, 2020	Dec. 24, 2021	Dec. 25, 2020	Mar. 26, 2021	Jun. 30, 2018	May 31, 2018
Related Party Transaction [Line Items]
Total net sales				$ 186,629,000	$ 164,449,000	$ 568,381,000	$ 416,099,000
Trade and other accounts receivable due from related party				28,305,000		28,305,000		$ 23,832,000
Amounts due to related party				4,051,000		4,051,000		2,353,000
Rent expense				1,454,000	1,172,000	4,226,000	3,477,000
Related Party Revenue
Related Party Transaction [Line Items]
Total net sales				39,461,000	26,439,000	112,079,000	72,570,000
Sanken
Related Party Transaction [Line Items]
Trade and other accounts receivable due from related party				28,251,000		28,251,000		21,595,000
Other accounts receivable from related party				54,000		$ 54,000		198,000
Option to terminate, period of notice						6 months
Rent expense				56,000	59,000	$ 166,000	173,000
Sanken | Related Party Revenue
Related Party Transaction [Line Items]
Total net sales				39,461,000	26,439,000	112,079,000	72,570,000
PSL
Related Party Transaction [Line Items]
Amounts due to related party				4,051,000		4,051,000		1,739,000
Purchases from related party				11,837,000	11,558,000	38,346,000	33,448,000
PSL | Loans Payable | Initial PSL Loan
Related Party Transaction [Line Items]
Face amount		$ 7,500,000
Stated interest rate		1.26%
Term		4 years
PSL | Loans Payable | Secondary PSL Loan | Forecast
Related Party Transaction [Line Items]
Face amount	$ 7,500,000
Stated interest rate	1.26%
Term	4 years
PSL | IC Technology Development Agreement
Related Party Transaction [Line Items]
Fees received				0	300,000	0	900,000
Fees paid				0	300,000	0	900,000
PSL | Discrete Technology Development Agreement
Related Party Transaction [Line Items]
Amounts due to related party								614,000
PSL | Price Support Payment
Related Party Transaction [Line Items]
Purchases from related party					1,500,000		5,000,000
Sanken Electric Europe Ltd.
Related Party Transaction [Line Items]
Trade and other accounts receivable due from related party				0		0		$ 1,272,000
Director
Related Party Transaction [Line Items]
Fees paid				$ 69,000	$ 82,000	$ 191,000	$ 262,000
Monthly fee payable									$ 19,000	$ 30,000
Signing fee			$ 54,000
Severance payment if terminated			$ 180,000
Accelerated vesting, acceleration period			6 months
Director | Common Class L
Related Party Transaction [Line Items]
Shares granted (in shares)			12,000,000