STOCK-BASED COMPENSATION - Rrestricted Stock (Details) $ / shares in Units, $ in Thousands		3 Months Ended		7 Months Ended	9 Months Ended		12 Months Ended
	Jul. 20, 2016 USD ($) item $ / shares	Oct. 01, 2016 USD ($) $ / shares shares	Oct. 03, 2015 USD ($)	Jul. 20, 2016 USD ($) item $ / shares shares	Oct. 01, 2016 USD ($) $ / shares shares	Oct. 03, 2015 USD ($) $ / shares	Jan. 02, 2016 USD ($) $ / shares shares	Oct. 01, 2016 USD ($) $ / shares	Aug. 18, 2016 shares	Jul. 02, 2016 $ / shares
Accrued liabilities
Share-based compensation narrative disclosures
Liability to holders of grants | $							$ 17,393
Restricted stock
Equity Incentive Plan
Fair value, per share	$ 23.53			$ 23.53			$ 10.24			$ 17.65
Unvested Restricted Shares:
Balance at beginning of fiscal year | shares				1,625,477	1,625,477
Granted | shares					224,378
Forfeited | shares					(431,407)
Repurchased | shares					(98,543)
Balance at end of period | shares		1,319,905			1,319,905		1,625,477
Vested Restricted Shares:
Balance at beginning of fiscal year | shares				2,913,207	2,913,207
Granted, vested | shares					431,407
Repurchased, vested | shares					(259,249)
Balance at end of period | shares		3,085,365			3,085,365		2,913,207
Weighted Average Grant Date Fair value per Share
Balance at beginning of fiscal year (in dollars per share)						$ 2.46	$ 2.46
Granted (in dollars per share)					$ 10.66
Forfeited (in dollars per share)					4.58
Repurchased (per share)					1.01
Balance at end of period (in dollars per share)		$ 3.26			3.26
Weighted average grant date fair value, Total restricted shares
Granted (per share)					10.66
Forfeited (in dollars per share)					4.58
Vested Restricted Shares (per share)
Balance, beginning of period (per share)						1.72	1.72
Granted (per share)					4.58
Repurchased (per share)					1.51
Balance, end of period (per share)		2.27			2.27
Unvested shares at end of period (price per share)		$ 3.26			$ 3.26	$ 2.46	$ 2.46	$ 3.26
Share-based compensation narrative disclosures
Compensation expense | $	$ 6,477
Unrecognized compensation expense | $								$ 9,940
Weighted average period for recognition of unrecognized compensation					9 months 4 days
Call right expiration, percentage of stock offered in public offering	25.00%			25.00%
Cash payments for repurchase of vested stock from terminated employees | $				$ 1,577		$ 0
Liability to holders of grants | $		$ 0
Restricted stock | Selling, general and administrative expenses
Share-based compensation narrative disclosures
Compensation expense | $		$ 12,736	$ 1,452		$ 24,589	$ 8,669
Restricted stock | Minimum
Equity Incentive Plan
Vesting period					3 years
Restricted stock | Maximum
Equity Incentive Plan
Vesting period					4 years
Equity Incentive Plan
Equity Incentive Plan
Authorized shares | shares									16,562,730
Share-based compensation narrative disclosures
Number of awardees | item	24			24