Acquisitions - Narrative (Detail) - USD ($) $ in Millions		1 Months Ended			9 Months Ended	12 Months Ended
	Oct. 15, 2018	Feb. 28, 2019	Oct. 31, 2018	Mar. 31, 2018	Dec. 29, 2018	Dec. 29, 2018	Dec. 28, 2019	Mar. 21, 2018
Mountain Valley
Business Acquisition [Line Items]
Total consideration	$ 80.0		$ 80.4
Payment of working capital settlement	0.4	$ 0.4
Business combination revenue						$ 10.1
Business combination net incomes						1.2
Acquisition related costs						1.0
Cash paid to sellers	62.5
Cash paid on behalf of sellers for sellers’ transaction expenses	1.8
Total consideration	$ 80.4						$ 80.0
Crystal rock acquisition
Business Acquisition [Line Items]
Total consideration				$ 37.7
Business combination revenue					$ 42.3
Acquisition related costs						$ 3.6
Cash paid to sellers				20.7
Cash paid on behalf of sellers for sellers’ transaction expenses				0.8
Assumed debt				16.2
Total consideration				$ 21.5			$ 21.5	$ 21.5