Goodwill - Rollforward (Details) $ in Thousands	9 Months Ended
Sep. 28, 2019 USD ($)
Goodwill
Beginning balance	$ 585,942
Acquisitions - preliminary allocation	26,553
Acquisition remeasurements	(5,678)
Sale of business unit	(1,343)
Currency translation	(15,491)
Ending balance	589,983
North America
Goodwill
Beginning balance	223,562
Acquisitions - preliminary allocation	26,553
Acquisition remeasurements	(4,430)
Sale of business unit	(1,343)
Currency translation	169
Ending balance	244,511
Europe
Goodwill
Beginning balance	279,688
Currency translation	(12,585)
Ending balance	267,103
Australasia
Goodwill
Beginning balance	82,692
Acquisition remeasurements	(1,248)
Currency translation	(3,075)
Ending balance	$ 78,369

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination.

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Amount of foreign currency translation gain (loss) which increases (decreases) an asset representing future economic benefits from other assets acquired in a business combination that are not individually identified and separately recognized.

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Amount of increase (decrease) from adjustments after acquisition date under purchase accounting of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Amount of divestiture of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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