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Acquisition (Canyon Bakehouse LLC) - Additional Information (Detail) $ in Thousands		12 Months Ended
	Dec. 14, 2018 USD ($)	Dec. 29, 2018 USD ($) Segment	Dec. 30, 2017 USD ($)	Jan. 14, 2017 USD ($)	Dec. 31, 2016 USD ($)
Business Acquisition [Line Items]
Goodwill		$ 545,379	$ 464,777	$ 801	$ 465,578
Number of business segments \| Segment		2
DSD Segment
Business Acquisition [Line Items]
Goodwill		$ 481,619	424,563		424,563
Warehouse Segment
Business Acquisition [Line Items]
Goodwill		$ 63,760	$ 40,214		$ 41,015
Canyon Bakehouse LLC
Business Acquisition [Line Items]
Percentage of outstanding membership interests acquired	100.00%
Date of acquisition		Dec. 14, 2018
Business acquisition, description		On December 14, 2018, the company completed the acquisition of 100% of the outstanding membership interests of Canyon, a leading gluten-free bread baker, from its members for total consideration of $205.2 million, including a $5.0 million earn-out recorded as contingent consideration. We believe the acquisition of Canyon strengthens our position as the second-largest baker in the U.S. by giving us access to the fast-growing gluten-free bread category. The acquisition has been accounted for as a business combination and the assets have been assigned to our DSD Segment and Warehouse Segment. Canyon’s sales and results of operations were immaterial for fiscal 2018. The total goodwill recorded for this acquisition was $80.6 million and it is deductible for tax purposes.
Total consideration paid	$ 205,207
Business acquisition, earn-out contingent consideration	5,000
Goodwill acquired	80,600
Acquisition-related costs		$ 4,500
Fair value of trade receivable		3,600
Gross amount receivables		3,700
Uncollectible receivables amount		$ 100
Goodwill	$ 80,602
Number of business segments \| Segment		2
Canyon Bakehouse LLC \| DSD Segment
Business Acquisition [Line Items]
Goodwill		$ 57,100
Canyon Bakehouse LLC \| Warehouse Segment
Business Acquisition [Line Items]
Goodwill		$ 23,500