Acquisitions and Purchase Accounting Estimated Fair Values of Assets Acquired and Liabilities Assumed - 2019 Acquisitions (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 26, 2020	Dec. 28, 2019
Business Acquisition [Line Items]
Goodwill	$ 1,855,361	$ 1,849,747
Commercial Foodservice Equipment Group
Business Acquisition [Line Items]
Goodwill	1,170,516	1,153,552
Food Processing Group
Business Acquisition [Line Items]
Goodwill	251,653	257,679
Residential Kitchen
Business Acquisition [Line Items]
Goodwill	433,192	$ 438,516
2019 Acquisitions
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents	2,673
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets	22,541
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment	8,754
Goodwill	88,625
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill	75,382
Business Combination Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Assets	2,716
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets	991
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities	(20,785)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Other	(10,299)
Business Combination Recognized Identifiable Assets Acquired Goodwill And Liabilities Assumed Initial Consideration, Net	170,598
Business Combination, Deferred Payments, Liability	2,404
Business Combination, Contingent Consideration, Liability	7,858
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net	180,860
Business Combinations, Deferred Tax Assets, Operating Loss Carryforwards	2,900
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities	1,000
Deferred Tax Assets, Tax Deferred Expense, Other	800
Business Acquisition, Goodwill, Expected Tax Deductible Amount	77,800
Business Combination, Intangible Assets, Other than Goodwill, Expected Tax Deductible Amount	64,800
2019 Acquisitions | Initial accounting
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents	2,683
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets	21,525
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment	8,920
Goodwill	99,838
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill	64,019
Business Combination Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Assets	1,288
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets	137
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities	(20,437)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Other	(6,170)
Business Combination Recognized Identifiable Assets Acquired Goodwill And Liabilities Assumed Initial Consideration, Net	171,803
Business Combination, Deferred Payments, Liability	2,404
Business Combination, Contingent Consideration, Liability	4,258
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net	178,465
2019 Acquisitions | Measurement period adjustment
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents	(10)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets	1,016
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment	(166)
Goodwill	(11,213)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill	11,363
Business Combination Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Assets	1,428
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets	854
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities	(348)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Other	(4,129)
Business Combination Recognized Identifiable Assets Acquired Goodwill And Liabilities Assumed Initial Consideration, Net	(1,205)
Business Combination, Deferred Payments, Liability	0
Business Combination, Contingent Consideration, Liability	3,600
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net	2,395
2019 Acquisitions | Commercial Foodservice Equipment Group
Business Acquisition [Line Items]
Goodwill	42,600
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill	35,500
2019 Acquisitions | Food Processing Group
Business Acquisition [Line Items]
Goodwill	34,900
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill	30,100
2019 Acquisitions | Residential Kitchen
Business Acquisition [Line Items]
Goodwill	11,200
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill	9,800
Tradenames And Trademarks | 2019 Acquisitions
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill	33,800
Customer Relationships | 2019 Acquisitions
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill	$ 27,900
Customer Relationships | 2019 Acquisitions | Minimum
Business Acquisition [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	5 years
Customer Relationships | 2019 Acquisitions | Maximum
Business Acquisition [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	10 years
Developed Technology Rights | 2019 Acquisitions
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill	$ 12,300
Developed Technology Rights | 2019 Acquisitions | Minimum
Business Acquisition [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	5 years
Developed Technology Rights | 2019 Acquisitions | Maximum
Business Acquisition [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	12 years
Backlog | 2019 Acquisitions
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill	$ 1,400
Backlog | 2019 Acquisitions | Minimum
Business Acquisition [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	3 months