Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.

No definition available.

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

BASIS OF PRESENTATION - Segments (Details) - segment	3 Months Ended		12 Months Ended
BASIS OF PRESENTATION - Segments (Details) - segment	Apr. 01, 2017	Apr. 02, 2016	Dec. 30, 2017	Dec. 31, 2016
NATURE OF OPERATIONS AND BASIS OF PRESENTATION
Number of reportable segments	3
Period in fiscal year	91 days	91 days	364 days	364 days
KATE SPADE North America
NATURE OF OPERATIONS AND BASIS OF PRESENTATION
Number of operating segments	1
KATE SPADE International
NATURE OF OPERATIONS AND BASIS OF PRESENTATION
Number of operating segments	3