Number of new stock issued during the period.

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Name:	us-gaap_StockIssuedDuringPeriodSharesNewIssues
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

Business Combination - Summary of Merger Consideration Paid to DTH Stockholders (except for the Levy Newco Parties) (Detail) - $ / shares	Aug. 08, 2016	Jan. 01, 2019	Jan. 02, 2018	Jan. 03, 2017
Business Acquisition [Line Items]
Issuance of common stock (in shares)	1,533,542
Value per share as of June 30, 2015		$ 4.92	$ 4.63	$ 3.31