Reportable Segments - Summary of Segment Description and Data (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Jun. 27, 2025	Dec. 26, 2025	Dec. 27, 2024	Dec. 29, 2023
Revenues:
Total segment revenues		$ 2,054.0	$ 2,097.6	$ 1,734.5
Cost of revenues:
Total cost revenues		1,731.1	1,741.3	1,457.2
Operating expenses:
Research and development		32.0	28.3	28.3
Sales and marketing		61.2	57.3	51.8
General and administrative		186.0	179.5	162.0
Impairment of goodwill	$ 151.1	151.1	0.0	0.0
Total operating expenses		430.3	265.1	242.1
Segment operating profit (loss):
Total segment operating profit		(107.4)	91.2	35.2
Interest income		3.9	4.8	4.1
Interest expense		(38.3)	(46.5)	(48.8)
Other income (expense), net		(3.9)	17.7	(1.8)
Income (loss) before provision for income taxes		(145.7)	67.2	(11.3)
Expenditures for segment property, plant and equipment
Total expenditures for segment assets		50.3	63.5	75.8
Depreciation and amortization
Total depreciation and amortization		76.0	76.1	61.7
Products
Assets		1,729.0	1,919.9
Products
Operating expenses:
Impairment of goodwill	77.6	77.6
Services
Operating expenses:
Impairment of goodwill	$ 73.5	73.5
Total operating expenses		131.8	60.5	60.9
Operating Segments
Segment operating profit (loss):
Total segment operating profit		(107.4)	91.2	35.2
Operating Segments | Products
Revenues:
Total segment revenues		1,799.3	1,853.7	1,501.6
Cost of revenues:
Total cost revenues		1,547.0	1,569.7	1,290.5
Operating expenses:
Research and development		21.3	18.8	17.8
Sales and marketing		48.1	46.7	41.4
General and administrative		151.5	139.1	122.0
Impairment of goodwill		77.6	0.0	0.0
Total operating expenses		298.5	204.6	181.2
Segment operating profit (loss):
Total segment operating profit		(46.2)	79.4	29.9
Expenditures for segment property, plant and equipment
Total expenditures for segment assets		31.7	40.4	62.4
Depreciation and amortization
Total depreciation and amortization		50.7	51.3	36.4
Products
Assets		1,446.0	1,657.0
Operating Segments | Services
Revenues:
Total segment revenues		254.7	243.9	232.9
Cost of revenues:
Total cost revenues		184.1	171.6	166.7
Operating expenses:
Research and development		10.7	9.5	10.5
Sales and marketing		13.1	10.6	10.4
General and administrative		34.5	40.4	40.0
Impairment of goodwill		73.5	0.0	0.0
Segment operating profit (loss):
Total segment operating profit		(61.2)	11.8	5.3
Expenditures for segment property, plant and equipment
Total expenditures for segment assets		18.6	23.1	13.4
Depreciation and amortization
Total depreciation and amortization		25.3	24.8	25.3
Products
Assets		283.0	262.9
Segment Reporting, Reconciling Item, Excluding Corporate Nonsegment
Segment operating profit (loss):
Interest income		3.9	4.8	4.1
Interest expense		(38.3)	(46.5)	(48.8)
Other income (expense), net		$ (3.9)	$ 17.7	$ (1.8)