CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (Parenthetical) - shares	3 Months Ended	6 Months Ended
Jun. 30, 2019	Jul. 01, 2018	Jun. 30, 2019	Jul. 01, 2018
Statement of Stockholders' Equity [Abstract]
Stock options (in shares)		7,875	279,510	2,185,201
Restricted stock unit vested (in shares)	59,967	31,357	221,087	223,174
Performance-based awards (in shares)			418,491	271,841

Number of share options (or share units) exercised during the current period.

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Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration