Goodwill - Schedule of Reconciliation of Activity for Goodwill (Detail) - USD ($) $ in Thousands		12 Months Ended
		Dec. 30, 2018	Dec. 31, 2017
Goodwill And Intangible Assets Disclosure [Abstract]
Beginning balance - goodwill		$ 169,316	$ 144,586
Goodwill, 2017 System Transformation Transactions acquisitions	[1]		35,867
Goodwill, Divestitures			(13,073)
Goodwill, Measurement period adjustments	[2]	(3,413)	1,936
Ending balance - goodwill		$ 165,903	$ 169,316

[1] 2017 System Transformation Transactions acquisitions includes an increase in goodwill of $7.4 million in 2017 from the opening balance sheets for the distribution territories and regional manufacturing facilities acquired in the System Transformation during 2017, as disclosed in the financial statements in the Company’s filed periodic reports. These adjustments are for post-closing adjustments made in accordance with the terms and conditions of the applicable asset purchase agreement or asset exchange agreement for each System Transformation Transaction.

[2] Measurement period adjustments relate to post-closing adjustments made in accordance with the terms and conditions of the applicable asset purchase agreement or asset exchange agreement for each System Transformation Transaction.