Summary of Significant Accounting Policies - Intangible Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 29, 2018	Dec. 30, 2017	Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]
Goodwill, Impairment Loss	$ 0
Other Comprehensive (Income) Loss, Defined Benefit Plan, before Reclassification Adjustment, Tax	(36,719)	$ 43,592
Indefinite-Lived Intangible Assets, Fair Value		93,000
Indefinite-Lived Intangible Assets, Carrying Value		151,000
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill)	0	58,000	$ 0
Gross Carrying amount	710,834	372,670
Finite-Lived Intangible Assets, Accumulated Amortization	(268,414)	(207,334)
Finite-Lived Intangible Assets, Amortization Expense	60,000	38,600	$ 29,900
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Tax	2,543	$ 4,243
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, Tax	6,900
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Tax	(1,700)
Goodwill, Impaired, Accumulated Impairment Loss	$ 0
Customer Relationships
Finite-Lived Intangible Assets [Line Items]
Estimated Weighted Avg Remaining LIfe	9 years 6 months	5 years 2 months
Gross Carrying amount	$ 644,145	$ 330,496
Finite-Lived Intangible Assets, Accumulated Amortization	$ (222,661)	$ (171,005)
Backlog
Finite-Lived Intangible Assets [Line Items]
Estimated Weighted Avg Remaining LIfe	2 years 9 months 18 days	9 months
Gross Carrying amount	$ 27,065	$ 19,689
Finite-Lived Intangible Assets, Accumulated Amortization	$ (24,755)	$ (18,081)
Developed Technology Rights
Finite-Lived Intangible Assets [Line Items]
Estimated Weighted Avg Remaining LIfe	5 years 10 months 24 days	4 years 2 months
Gross Carrying amount	$ 39,624	$ 22,485
Finite-Lived Intangible Assets, Accumulated Amortization	(20,998)	(18,248)
Tradenames And Trademarks
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	$ 918,604	$ 615,090