Significant Accounting Policies - Amounts Due from Banks (Detail) - USD ($) $ in Thousands	Dec. 30, 2018	Dec. 31, 2017
Cash And Cash Equivalents [Abstract]
Due from banks for debit and credit card transactions	$ 52,896	$ 51,825

A bank's noninterest bearing demand deposits in other banks (such as correspondents).

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.1)
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Name:	us-gaap_DueFromBanks
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant