Segment information - Additional Information (Detail)	12 Months Ended
Dec. 30, 2017 customer brand segment
Segment Reporting [Abstract]
Number of brands \| brand	2
Number of reportable segments \| segment	4
Number of Customers Accounted for More than 10% of Total Revenues \| customer	0

Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

No definition available.

Name:	us-gaap_NumberOfReportableSegments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration