Schedule of Intangible Assets Subject to Amortization (Detail) - Canyon Bakehouse LLC $ in Thousands	12 Months Ended
	Dec. 29, 2018 USD ($)
Finite And Infinite Lived Intangible Assets [Line Items]
Acquired intangible assets subject to amortization	$ 78,380
Weighted average amortization years	32 years 10 months 24 days
Trademarks
Finite And Infinite Lived Intangible Assets [Line Items]
Acquired intangible assets subject to amortization	$ 41,700
Weighted average amortization years	40 years
Attribution Method	Straight-line
Customer Relationships
Finite And Infinite Lived Intangible Assets [Line Items]
Acquired intangible assets subject to amortization	$ 36,400
Weighted average amortization years	25 years
Attribution Method	Sum of year digits
Non-Compete Agreements
Finite And Infinite Lived Intangible Assets [Line Items]
Acquired intangible assets subject to amortization	$ 280
Weighted average amortization years	1 year 8 months 12 days
Attribution Method	Straight-line