Leases - Additional Information (Detail) - USD ($) $ in Thousands	4 Months Ended	12 Months Ended
	Apr. 20, 2019	Dec. 29, 2018
Lessee Lease Description [Line Items]
Lessee, operating lease, existence of residual value guarantees	false
Lessee, operating lease, residual value guarantees, description	Additionally, these contracts do not contain residual value guarantees, and there are no other restrictions or covenants in the contracts.
Short-term lease expense	$ 814
Increase in lease assets and liabilities, net	$ 1,300
Lease arrangements expiration period		18 years
Minimum
Lessee Lease Description [Line Items]
Lessee, operating lease term	1 year
Lessee, operating lease renewal term	1 month
Lease term		2 years
Operating lease period		1 month
Maximum
Lessee Lease Description [Line Items]
Lessee, operating lease term	26 years
Lessee, operating lease renewal term	10 years
Lease term		26 years
Operating lease period		10 years
Bakery Equipment
Lessee Lease Description [Line Items]
Lessee, operating lease term	less than a year up to eight years
Bakery Equipment | Maximum
Lessee Lease Description [Line Items]
Lessee, operating lease term	8 years
Transportation Equipment
Lessee Lease Description [Line Items]
Lessee, operating lease term	less than one year up to seven years
Transportation Equipment | Maximum
Lessee Lease Description [Line Items]
Lessee, operating lease term	7 years
IT Equipment
Lessee Lease Description [Line Items]
Lessee, operating lease term	less than a year up to five years
IT Equipment | Maximum
Lessee Lease Description [Line Items]
Lessee, operating lease term	5 years
Certain Equipment and IT Equipment | Maximum
Lessee Lease Description [Line Items]
Lessee, operating lease term	shorter than a year
Buildings and Land
Lessee Lease Description [Line Items]
Lessee, operating lease, existence of residual value guarantees	false
Lessee, operating lease, residual value guarantees, description	Additionally, these contracts do not contain residual value guarantees, and there are no other restrictions or covenants in the contracts.
Short Term Leases
Lessee Lease Description [Line Items]
Lessee, operating lease, existence of residual value guarantees	false
Lessee, operating lease, residual value guarantees, description	do not contain residual value guarantees, and there are no other restrictions or covenants in the leases.
Lessee, operating lease, purchase options	false
Lessee, operaing lease, option to extend, description	There are no purchase options present, however, there generally are renewals that could extend lease terms for additional periods.
Short Term Leases | Minimum
Lessee Lease Description [Line Items]
Lessee, operating lease term	1 month
Short Term Leases | Maximum
Lessee Lease Description [Line Items]
Lessee, operating lease term	12 months