Description of Business and Summary of Significant Accounting Policies - Additional Information (Detail) $ in Thousands		3 Months Ended					12 Months Ended
	Apr. 30, 2008 shares	Mar. 31, 2019 shares	Dec. 31, 2017 USD ($)	Oct. 01, 2017 USD ($)	Jul. 02, 2017 USD ($)	Apr. 02, 2017 USD ($)	Dec. 30, 2018 USD ($) Segment Benefit_Plan Vote shares	Dec. 31, 2017 USD ($) shares	Jan. 01, 2017 USD ($) shares
Description Of Business And Summary Of Significant Accounting Policies [Line Items]
Bottle and can volume to retail customers							88.00%
Number of operating segments | Segment							4
Number of additional operating segments do not meet quantitative thresholds for separate reporting | Segment							3
Period of collection of trade account receivable							30 days
Amortization expenses of internal-use software | $							$ 10,000	$ 11,900	$ 10,900
Percentage of maximum tax benefit							50.00%
Number of votes per share | Vote							1
Percentage control of total voting power							86.00%
Class B Common Stock is convertible into Common Stock Ratio							one-for-one per share
Anti-dilutive shares | shares							0	0	0
Cumulative effect adjustment increase in retained earnings | $							$ 20,000
Class B Common Stock [Member]
Description Of Business And Summary Of Significant Accounting Policies [Line Items]
Performance units authorized | shares	400,000
Term of performance unit award agreement	10 years
Performance unit award agreement expiration period	2018
Final potential award issued based on the performence unit | shares							36,800	40,000	40,000
Common B stock per performance unit | shares	1
Maximum overall goal achievement factor	100.00%
Annual performance units granted | shares	40,000
Number of votes per share | Vote							20
Class B Common Stock [Member] | Scenario Forecast [Member]
Description Of Business And Summary Of Significant Accounting Policies [Line Items]
Final potential award issued based on the performence unit | shares		40,000
Selling Delivery and Administrative Expenses [Member]
Description Of Business And Summary Of Significant Accounting Policies [Line Items]
Shipping and handling costs | $							$ 610,700	$ 550,900	$ 395,400
Net Pension Activity [Member]
Description Of Business And Summary Of Significant Accounting Policies [Line Items]
Number of company-sponsored pension plans | Benefit_Plan							2
Net periodic benefit cost | $							$ 5,274	4,324	1,880
Non-service Cost Components of Net Periodic Benefit Cost [Member] | Other Expense [Member] | ASU 2017-07 [Member]
Description Of Business And Summary Of Significant Accounting Policies [Line Items]
Net periodic benefit cost | $			$ 1,300	$ 1,300	$ 1,300	$ 1,300
Non-service Cost Components of Net Periodic Benefit Cost [Member] | Other Expense [Member] | Nonalcoholic Beverage Segment [Member] | ASU 2017-07 [Member]
Description Of Business And Summary Of Significant Accounting Policies [Line Items]
Net periodic benefit cost | $							$ 2,500
Non-service Cost Components of Net Periodic Benefit Cost and Other Benefit Plan Charges [Member] | Other Expense [Member] | Nonalcoholic Beverage Segment [Member] | ASU 2017-07 [Member]
Description Of Business And Summary Of Significant Accounting Policies [Line Items]
Net periodic benefit cost | $								$ 5,400	$ 3,300
Distribution Rights [Member]
Description Of Business And Summary Of Significant Accounting Policies [Line Items]
Estimated useful life						40 years
Minimum [Member] | Distribution Rights [Member]
Description Of Business And Summary Of Significant Accounting Policies [Line Items]
Estimated useful life							10 years
Minimum [Member] | Customer Relationships [Member]
Description Of Business And Summary Of Significant Accounting Policies [Line Items]
Estimated useful life							5 years
Maximum [Member] | Class B Common Stock [Member] | Scenario Forecast [Member]
Description Of Business And Summary Of Significant Accounting Policies [Line Items]
Final potential award issued based on the performence unit | shares		40,000
Maximum [Member] | Distribution Rights [Member]
Description Of Business And Summary Of Significant Accounting Policies [Line Items]
Estimated useful life							40 years
Maximum [Member] | Customer Relationships [Member]
Description Of Business And Summary Of Significant Accounting Policies [Line Items]
Estimated useful life							12 years