NET INCOME PER SHARE (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended									12 Months Ended
	Dec. 27, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 28, 2012	Dec. 28, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 27, 2013	Dec. 28, 2012	Dec. 30, 2011
Earnings Per Share [Abstract]
Net income	$ 14,511	$ 18,952	$ 12,537	$ (1,076)	$ 7,415		$ 14,347	$ 10,337	$ 1,530	$ 44,924	$ 33,629	$ 30,791
Weighted average number of common shares used in basic net income per common share										40,166,000	39,548,000	41,961,000
Dilutive effect of outstanding stock options and non-vested restricted stock										336,000	364,000	341,000
Weighted average number of common shares used in diluted net income per common share										40,502,000	39,862,000	42,322,000
Net income per common share:
Basic (in dollars per share)	$ 0.36	$ 0.47	$ 0.31	$ (0.03)	$ 0.19		$ 0.36	$ 0.26	$ 0.04	$ 1.12	$ 0.85	$ 0.73
Diluted (in dollars per share)	$ 0.36	$ 0.47	$ 0.31	$ (0.03)	$ 0.19		$ 0.36	$ 0.26	$ 0.04	$ 1.11	$ 0.84	$ 0.73
Anti-dilutive shares						700,000				100,000	700,000	1,000,000