Acquisitions and Purchase Accounting Estimated Fair Values of Assets Acquired and Liabilities Assumed - 2020 Acquisitions (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 27, 2020	Dec. 28, 2019
Business Acquisition [Line Items]
Goodwill	$ 1,841,684	$ 1,849,747
2020 Acquisitions
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents	2,347
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets	18,370
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment	791
Goodwill	13,109
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill	16,484
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets	1,708
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities	(17,378)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Other	(3,070)
Business Combination Recognized Identifiable Assets Acquired Goodwill And Liabilities Assumed Initial Consideration, Net	32,361
Business Combination, Deferred Payments, Liability	1,250
Business Combination, Contingent Consideration, Liability	1,774
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net	35,385
2020 Acquisitions | Initial accounting
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents	2,347
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets	31,089
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment	1,032
Goodwill	12,776
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill	16,484
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets	1,708
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities	(30,005)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Other	(3,070)
Business Combination Recognized Identifiable Assets Acquired Goodwill And Liabilities Assumed Initial Consideration, Net	32,361
Business Combination, Deferred Payments, Liability	1,250
Business Combination, Contingent Consideration, Liability	1,774
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net	35,385
2020 Acquisitions | Measurement period adjustment
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents	0
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets	(12,719)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment	(241)
Goodwill	333
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill	0
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets	0
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities	12,627
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Other	0
Business Combination Recognized Identifiable Assets Acquired Goodwill And Liabilities Assumed Initial Consideration, Net	0
Business Combination, Deferred Payments, Liability	0
Business Combination, Contingent Consideration, Liability	0
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net	0
Tradenames And Trademarks | 2020 Acquisitions
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill	9,000
Customer Relationships | 2020 Acquisitions
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill	5,300
Developed Technology Rights | 2020 Acquisitions
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill	200
Backlog | 2020 Acquisitions
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill	$ 2,000
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	9 months
Maximum | Customer Relationships | 2020 Acquisitions
Business Acquisition [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	7 years
Maximum | Developed Technology Rights | 2020 Acquisitions
Business Acquisition [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	7 years
Commercial Foodservice Equipment Group
Business Acquisition [Line Items]
Goodwill	$ 1,163,920	$ 1,153,552
Commercial Foodservice Equipment Group | 2020 Acquisitions
Business Acquisition [Line Items]
Goodwill	13,100
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill	$ 16,500