CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares	Dec. 27, 2015	Dec. 28, 2014
Preferred Stock:
Par value (usd per share)	$ 0.001	$ 0.001
Shares authorized (in shares)	5,000,000	5,000,000
Shares outstanding (in shares)	0	0
Common Stock:
Par value (in dollars per share)	$ 0.001	$ 0.001
Shares authorized (in shares)	195,000,000	195,000,000
Shares issued (in shares)	59,139,651	57,801,978
Shares outstanding (in shares)	59,139,651	57,801,978