SHARE-BASED COMPENSATION - Stock Options by Plan (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Jan. 02, 2016	Jan. 03, 2015	Dec. 28, 2013
SHARE-BASED COMPENSATION
Share-based compensation expense	$ 25,600	$ 37,300	$ 7,300
Payroll and Related Costs and Spending
SHARE-BASED COMPENSATION
Share-based compensation expense	$ 300	$ 17,300	$ 2,800
2011 Plan
SHARE-BASED COMPENSATION
Authorized for issuance of common stock	3,000,000
2011 Plan | Maximum
SHARE-BASED COMPENSATION
Number of shares authorized to grants of restricted stock, restricted stock units, unrestricted stock and performance shares	1,500,000
2013 Plan
SHARE-BASED COMPENSATION
Authorized for issuance of common stock	9,500,000
Shares available for future grant	7,600,000
Stock options
SHARE-BASED COMPENSATION
Holding period of shares, if previously acquired shares are tendered as payment	6 months
Vesting period	3 years
Valuation Assumptions:
Weighted-average fair value of options granted (in dollars per share)	$ 15.92		$ 10.32
Expected volatility (as a percent)	76.50%		59.50%
Weighted-average volatility (as a percent)	58.70%		59.50%
Expected term (in years)	4 years 2 months 12 days		4 years 10 months 24 days
Risk-free rate, minimum (as a percent)	1.90%		0.10%
Risk-free rate, maximum (as a percent)			3.90%
Expected annual forfeiture (as a percent)	15.30%		12.40%
Shares
Outstanding at the beginning of the period (in shares)	1,030,969
Granted (in shares)	174,458
Exercised (in shares)	(244,780)
Cancelled/expired (in shares)	(54,764)
Outstanding at end of the period (in shares)	905,883	1,030,969
Vested or expected to vest at the end of the period (in shares)	873,924
Exercisable at the end of the period (in shares)	573,593
Weighted Average Exercise Price
Outstanding at the beginning of the period (in dollars per share)	$ 11.25
Granted (in dollars per share)	34.29
Exercised (in dollars per share)	10.07
Cancelled/expired (in dollars per share)	22.08
Outstanding at the end of the period (in dollars per share)	15.35	$ 11.25
Vested or expected to vest at the end of the period (in dollars per share)	14.68
Exercisable at the end of the period (in dollars per share)	$ 8.12
Weighted Average Remaining Contractual Term
Outstanding at the end of the period	3 years 4 months 24 days	3 years 10 months 24 days
Vested or expected to vest at the end of the period	3 years 4 months 24 days
Exercisable at the end of the period	2 years 4 months 24 days
Aggregate Intrinsic Value
Outstanding at the beginning of the period (in dollars)	$ 21,613
Exercised (in dollars)	5,869
Outstanding at the end of the period (in dollars)	5,686	$ 21,613
Vested or expected to vest at the end of the period (in dollars)	5,686
Exercisable at the end of the period (in dollars)	$ 5,686
Intrinsic value of options exercised (in dollars per share)	$ 23.98	$ 24.62	$ 16.46
Additional disclosure
Nonvested stock options outstanding (in shares)	300,000
Weighted average grant date fair value per award for nonvested stock options (in dollars per share)	$ 13.20
Total unrecognized compensation cost related to nonvested stock options granted	$ 2,200
Weighted average recognition period of unrecognized stock-based compensation expense	1 year 3 months 18 days
Fair value of shares vested under stock option plans	$ 2,300	$ 3,200	$ 4,900
Stock options | Minimum
SHARE-BASED COMPENSATION
Contractual term	7 years
Stock options | Maximum
SHARE-BASED COMPENSATION
Contractual term	10 years