Share-based Compensation, ASU 2016-09 (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended	12 Months Ended
Jun. 28, 2016	Jun. 27, 2017	Jun. 28, 2016	Dec. 27, 2016
ASU 2016-09 Compensation-Stock Compensation
ASU 2016-09
Cumulative effect on retained earnings	$ 0.0	$ (0.1)	$ 0.0	$ 0.0

Amount of the cumulative effect on retained earnings net of related income tax effect.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 250
-SubTopic 10
-Section 50
-Paragraph 9
-URI http://asc.fasb.org/extlink&oid=64853466&loc=d3e22663-107794

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration