Summary of Significant Accounting Policies and Other Information - Narrative (Details) customer in Thousands, associate in Thousands, € in Millions	3 Months Ended			12 Months Ended
	Dec. 27, 2025 USD ($) associate country	Dec. 28, 2024 USD ($)	Mar. 30, 2024 USD ($)	Dec. 27, 2025 USD ($) associate customer country	Dec. 28, 2024 USD ($)	Dec. 30, 2023 USD ($)	Dec. 27, 2025 EUR (€) associate country	Sep. 27, 2025	Dec. 28, 2024 EUR (€)
Summary of Significant Accounting Policies and Other Information
Countries where product is used (country) | country	20			20			20
Global associates (associate) | associate	17			17			17
Number of customers (over) | customer				100
Cost of sales				$ 1,480,251,000	$ 1,403,226,000	$ 1,462,416,000
Inventory	$ 416,472,000	$ 416,273,000		416,472,000	416,273,000
Equity investment	7,676,000	10,182,000		7,676,000	10,182,000
Gain (loss) from equity method investments				1,000,000.0	600,000
Equity method investments	12,300,000	13,100,000		12,300,000	13,100,000
Goodwill impairment				301,185,000	44,763,000	0
Goodwill	1,211,411,000	1,228,502,000		1,211,411,000	1,228,502,000	1,309,998,000
Impairment of intangible assets					47,800,000
Allowance for credit losses	2,500,000	1,600,000		2,500,000	1,600,000
Advertising expense				4,000,000.0	5,000,000.0	4,000,000.0
Foreign exchange loss (gain)				16,612,000	(9,230,000)	12,299,000
Loss contingency accrual	2,200,000	2,300,000		2,200,000	2,300,000		€ 1.8		€ 2.2
Interest inc				26,300,000	$ 28,000,000.0	18,900,000
Toll charge, noncurrent				8,200,000
Impairment, Intangible Asset, Statement of Income or Comprehensive Income [Extensible Enumeration]					Restructuring, impairment, and other charges
Adjustments
Summary of Significant Accounting Policies and Other Information
Cost of sales					$ 12,300,000
Inventory		(12,300,000)			(12,300,000)
Transportation Segment
Summary of Significant Accounting Policies and Other Information
Goodwill impairment				0	8,616,000
Goodwill	197,399,000	191,641,000		197,399,000	191,641,000	203,111,000
Impairment of long lived assets to be disposed of			$ 900,000	500,000
Industrial
Summary of Significant Accounting Policies and Other Information
Goodwill impairment				0	36,147,000
Goodwill	289,683,000	129,990,000		289,683,000	129,990,000	170,382,000
Impairment of intangible assets		47,800,000				900,000
Electronics
Summary of Significant Accounting Policies and Other Information
Goodwill impairment				301,185,000	0
Goodwill	724,329,000	906,871,000		724,329,000	906,871,000	936,505,000
Impairment of long lived assets to be disposed of				400,000
90 days past due
Summary of Significant Accounting Policies and Other Information
Allowance for credit losses	$ 9,300,000	3,800,000		9,300,000	3,800,000
Shipping and handling cost and expenses | Selling, general, and administrative expenses
Summary of Significant Accounting Policies and Other Information
Cost of sales				$ 14,300,000	15,300,000	15,400,000
Customer relationships
Summary of Significant Accounting Policies and Other Information
Impairment of intangible assets					47,600,000
Customer relationships | Transportation Segment
Summary of Significant Accounting Policies and Other Information
Impairment of intangible assets			$ 900,000
Customer relationships | Industrial
Summary of Significant Accounting Policies and Other Information
Impairment of intangible assets					200,000
Land use rights
Summary of Significant Accounting Policies and Other Information
Finite lived intangible asset weighted average useful life (years)	50 years			50 years			50 years
Industrial Controls
Summary of Significant Accounting Policies and Other Information
Goodwill impairment		36,100,000			36,147,000
Goodwill	$ 238,500,000			$ 238,500,000
Percentage of fair value in excess of carrying value (percent)								22.00%
Impairment of intangible assets					47,579,000
Industrial Controls | Patents, licenses, and software
Summary of Significant Accounting Policies and Other Information
Impairment of intangible assets					6,938,000
Automotive Sensors
Summary of Significant Accounting Policies and Other Information
Goodwill impairment		8,600,000			8,616,000
Goodwill	274,900,000			274,900,000
Electronics – Passive Products and Sensors
Summary of Significant Accounting Policies and Other Information
Goodwill impairment	$ 301,185,000			$ 301,200,000
Percentage of fair value in excess of carrying value (percent)								87.00%
Passenger Car Products
Summary of Significant Accounting Policies and Other Information
Percentage of fair value in excess of carrying value (percent)								153.00%
Commercial Vehicle Products
Summary of Significant Accounting Policies and Other Information
Percentage of fair value in excess of carrying value (percent)								99.00%
Industrial Circuit Protection
Summary of Significant Accounting Policies and Other Information
Percentage of fair value in excess of carrying value (percent)								303.00%
Minimum
Summary of Significant Accounting Policies and Other Information
Percentage of fair value in excess of carrying value (percent)	22.00%			22.00%			22.00%
Minimum | Customer relationships
Summary of Significant Accounting Policies and Other Information
Finite lived intangible asset weighted average useful life (years)	3 years			3 years			3 years
Minimum | Trademarks and tradenames
Summary of Significant Accounting Policies and Other Information
Finite lived intangible asset weighted average useful life (years)	3 years			3 years			3 years
Minimum | Patents, licenses, and software
Summary of Significant Accounting Policies and Other Information
Finite lived intangible asset weighted average useful life (years)	4 years			4 years			4 years
Minimum | Distribution network
Summary of Significant Accounting Policies and Other Information
Finite lived intangible asset weighted average useful life (years)	4 years			4 years			4 years
Maximum
Summary of Significant Accounting Policies and Other Information
Percentage of fair value in excess of carrying value (percent)	303.00%			303.00%			303.00%
Maximum | Customer relationships
Summary of Significant Accounting Policies and Other Information
Finite lived intangible asset weighted average useful life (years)	20 years			20 years			20 years
Maximum | Trademarks and tradenames
Summary of Significant Accounting Policies and Other Information
Finite lived intangible asset weighted average useful life (years)	20 years			20 years			20 years
Maximum | Patents, licenses, and software
Summary of Significant Accounting Policies and Other Information
Finite lived intangible asset weighted average useful life (years)	17 years			17 years			17 years
Maximum | Distribution network
Summary of Significant Accounting Policies and Other Information
Finite lived intangible asset weighted average useful life (years)	10 years			10 years			10 years
Buildings
Summary of Significant Accounting Policies and Other Information
Useful life (in years)	35 years			35 years			35 years
Buildings | Electronics
Summary of Significant Accounting Policies and Other Information
Impairment of long lived assets to be disposed of						3,900,000
Equipment | Minimum
Summary of Significant Accounting Policies and Other Information
Useful life (in years)	3 years			3 years			3 years
Equipment | Maximum
Summary of Significant Accounting Policies and Other Information
Useful life (in years)	20 years			20 years			20 years
Furniture and Fixtures
Summary of Significant Accounting Policies and Other Information
Useful life (in years)	7 years			7 years			7 years
Tooling
Summary of Significant Accounting Policies and Other Information
Useful life (in years)	5 years			5 years			5 years
Computer Equipment
Summary of Significant Accounting Policies and Other Information
Useful life (in years)	3 years			3 years			3 years
Machinery and equipment | Electronics
Summary of Significant Accounting Policies and Other Information
Impairment of long lived assets to be disposed of						$ 100,000
Other long-term assets
Summary of Significant Accounting Policies and Other Information
Marketable securities	$ 25,700,000	23,300,000		$ 25,700,000	23,300,000
Polytronics
Summary of Significant Accounting Policies and Other Information
Ownership percentage	6.70%			6.70%			6.70%
Equity investment	$ 7,700,000	$ 10,200,000		$ 7,700,000	$ 10,200,000		€ 6.5		€ 9.8
Powersem | Related Party
Summary of Significant Accounting Policies and Other Information
Ownership percentage	45.00%			45.00%			45.00%
EB Tech | Related Party
Summary of Significant Accounting Policies and Other Information
Ownership percentage	15.00%			15.00%			15.00%
ATEC | Related Party
Summary of Significant Accounting Policies and Other Information
Ownership percentage	24.00%			24.00%			24.00%