CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (Parenthetical) - shares	12 Months Ended
	Dec. 31, 2017	Dec. 25, 2016	Dec. 27, 2015
Statement of Stockholders' Equity [Abstract]
Stock options (in shares)	657,704	114,652	341,362
Restricted stock unit vested (in shares)	283,116	304,171	233,901
Performance-based awards (in shares)	115,881	524,520	87,134
Warrants (in shares)			15,900,000
Shares repurchased (in shares)		1,179,672	5,511,233