Recently Issued Accounting Standards - Additional Information (Detail) - Accounting Standards Update 2016-09 [Member] - USD ($) $ in Millions	4 Months Ended
Apr. 22, 2017	Apr. 23, 2016
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Recognition of tax benefits in provision for income taxes	$ 1.1
Increase in net cash provided by operating activities		$ (1.4)
Increase in net cash used in financing activities		$ 1.4

Amount of the effect of a change in accounting principle on net income.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 250
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=64853466&loc=d3e22583-107794

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 250
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)(2)
-URI http://asc.fasb.org/extlink&oid=64853466&loc=d3e22499-107794

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 250
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=64853466&loc=d3e22580-107794

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration