Acquisitions - Allocation of Purchase Price to Fair Value of Assets Acquired and Liabilities Assumed (Detail) - USD ($) $ in Millions	Sep. 29, 2018	Mar. 23, 2018	Dec. 30, 2017
Business Acquisition [Line Items]
Goodwill	$ 1,129.1		$ 1,104.7
Intangible assets	13.9
Crystal Rock Acquisition
Business Acquisition [Line Items]
Cash	1.6	$ 1.6
Accounts receivable	6.4	6.5
Inventory	2.2	2.3
Prepaid expenses and other assets	1.5	1.2
Property, plant and equipment	9.3	9.4
Goodwill	14.0	16.7
Intangible assets	13.9	13.3
Other assets	0.1	0.8
Short-term borrowings	(4.1)	(4.1)
Current maturities of long-term debt	(1.6)	(1.6)
Accounts payable and accrued liabilities	(7.4)	(5.2)
Long-term debt	(10.4)	(10.4)
Deferred tax liabilities	(3.1)	(6.5)
Other long-term liabilities	(0.9)	(2.5)
Total	21.5	$ 21.5
Scenario, Adjustment | Crystal Rock Acquisition
Business Acquisition [Line Items]
Cash	0.0
Accounts receivable	(0.1)
Inventory	(0.1)
Prepaid expenses and other assets	0.3
Property, plant and equipment	(0.1)
Goodwill	(2.7)
Intangible assets	0.6
Other assets	(0.7)
Short-term borrowings	0.0
Current maturities of long-term debt	0.0
Accounts payable and accrued liabilities	(2.2)
Long-term debt	0.0
Deferred tax liabilities	3.4
Other long-term liabilities	1.6
Total	$ 0.0