Goodwill and Other Intangible Assets - Narrative (Detail) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 27, 2020	Jun. 29, 2019	Jun. 27, 2020	Jun. 29, 2019	Dec. 28, 2019
Acquired Finite And Indefinite Lived Intangible Assets [Line Items]
Goodwill	$ 924,500,000		$ 924,500,000		$ 913,800,000
Accumulated impairment losses	0		$ 0
Weighted-average amortization period (in years)			11 years
Aggregate amortization expense	5,700,000	$ 5,400,000	$ 11,400,000	$ 10,800,000
Estimated annual amortization expense for fiscal period 2020	22,000,000.0		22,000,000.0
Estimated annual amortization expense for fiscal period 2021	19,500,000		19,500,000
Estimated annual amortization expense for fiscal period 2022	16,300,000		16,300,000
Estimated annual amortization expense for fiscal period 2023	13,500,000		13,500,000
Estimated annual amortization expense for fiscal period 2024	10,700,000		10,700,000
Estimated annual amortization expense for fiscal period 2025	6,400,000		6,400,000
Sigmavision
Acquired Finite And Indefinite Lived Intangible Assets [Line Items]
Goodwill	5,600,000		5,600,000
Cognitran Limited
Acquired Finite And Indefinite Lived Intangible Assets [Line Items]
Goodwill	14,500,000		$ 14,500,000
Customer relationships
Acquired Finite And Indefinite Lived Intangible Assets [Line Items]
Weighted-average amortization period (in years)			15 years
Customer relationship contractual term, minimum (in years)			3 years
Customer relationship contractual term, maximum (in years)			5 years
Repair Systems & Information Group
Acquired Finite And Indefinite Lived Intangible Assets [Line Items]
Goodwill	623,500,000		$ 623,500,000		$ 615,100,000
Repair Systems & Information Group | Sigmavision
Acquired Finite And Indefinite Lived Intangible Assets [Line Items]
Goodwill	5,600,000		$ 5,600,000
Repair Systems & Information Group | Cognitran Limited
Acquired Finite And Indefinite Lived Intangible Assets [Line Items]
Goodwill, purchase accounting adjustments	$ 3,100,000