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NET INCOME PER SHARE (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 26, 2014	Sep. 26, 2014	Jun. 27, 2014	Mar. 28, 2014	Dec. 27, 2013	Sep. 27, 2013	Jun. 28, 2013	Mar. 29, 2013	Dec. 26, 2014	Dec. 27, 2013	Dec. 28, 2012
Earnings Per Share [Abstract]
Net income	$ 27,027us-gaap_NetIncomeLoss	$ 20,910us-gaap_NetIncomeLoss	$ 16,082us-gaap_NetIncomeLoss	$ 1,656us-gaap_NetIncomeLoss	$ 14,511us-gaap_NetIncomeLoss	$ 18,952us-gaap_NetIncomeLoss	$ 12,537us-gaap_NetIncomeLoss	$ (1,076)us-gaap_NetIncomeLoss	$ 65,675us-gaap_NetIncomeLoss	$ 44,924us-gaap_NetIncomeLoss	$ 33,629us-gaap_NetIncomeLoss
Weighted average number of common shares used in basic net income per common share									40,734us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	40,166us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	39,548us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Dilutive effect of outstanding stock options and non-vested restricted stock									442us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment	336us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment	314us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment
Weighted average number of common shares used in diluted net income per common share									41,176us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	40,502us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	39,862us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Net income per common share:
Basic (in dollars per share)	$ 0.67us-gaap_EarningsPerShareBasic	$ 0.51us-gaap_EarningsPerShareBasic	$ 0.39us-gaap_EarningsPerShareBasic	$ 0.04us-gaap_EarningsPerShareBasic	$ 0.36us-gaap_EarningsPerShareBasic	$ 0.47us-gaap_EarningsPerShareBasic	$ 0.31us-gaap_EarningsPerShareBasic	$ (0.03)us-gaap_EarningsPerShareBasic	$ 1.61us-gaap_EarningsPerShareBasic	$ 1.12us-gaap_EarningsPerShareBasic	$ 0.85us-gaap_EarningsPerShareBasic
Diluted (in dollars per share)	$ 0.65us-gaap_EarningsPerShareDiluted	$ 0.51us-gaap_EarningsPerShareDiluted	$ 0.39us-gaap_EarningsPerShareDiluted	$ 0.04us-gaap_EarningsPerShareDiluted	$ 0.36us-gaap_EarningsPerShareDiluted	$ 0.47us-gaap_EarningsPerShareDiluted	$ 0.31us-gaap_EarningsPerShareDiluted	$ (0.03)us-gaap_EarningsPerShareDiluted	$ 1.59us-gaap_EarningsPerShareDiluted	$ 1.11us-gaap_EarningsPerShareDiluted	$ 0.84us-gaap_EarningsPerShareDiluted
Anti-dilutive shares									58us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	78us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	726us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount

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