STOCKHOLDERS' EQUITY (Details) $ / shares in Units, $ in Thousands				1 Months Ended		12 Months Ended
	Nov. 28, 2018 $ / shares shares	Oct. 29, 2018 USD ($) shares	May 17, 2016 USD ($) $ / shares	Oct. 31, 2018 shares	Mar. 31, 2018 USD ($) $ / shares shares	Jan. 02, 2021 USD ($) shares	Dec. 28, 2019 USD ($) shares	Dec. 29, 2018 USD ($)	Oct. 24, 2018 $ / shares
Share Data
Shares repurchased (in shares)					400,000
Repurchase price per share (in dollars per share) | $ / shares					$ 4.95
Cash paid for repurchase of common stock | $					$ 2,000	$ 0	$ 0	$ 1,967
Reverse stock split ratio				0.397
Number of shares authorized (in shares)				200,000,000.0		600,000,000.0	600,000,000
Number of preferred stock authorized (in shares)				30,000,000.0
Total number of shares authorized (in shares)				630,000,000.0
Number of shares authorized, preferred stock (in shares)						30,000,000.0	30,000,000
Shares issued (in shares)				0
Option to purchase additional shares from selling stockholders, period		30 days
Cash dividend paid (in dollars per share) | $ / shares			$ 5.54
Dividend paid | $			$ 451,300				$ 600	$ 2,500
Percentage used to calculate the difference in strike price and dividend			0.70
Total dividends | $			$ 7,900
IPO
Share Data
Cumulative common stock sold (in shares)		16,000,000.0
Company's common stock sold (in shares)		2,500,000
Common stock sold by selling stockholders (in shares)		13,500,000
Public offering, shares issued price (in dollars per share) | $ / shares									$ 18.00
Net proceeds after deducting underwriting discounts and commissions | $		$ 42,400
IPO underwriting discounts and commissions | $		2,600
IPO offering costs incurred | $		$ 4,600
Additional allotment option
Share Data
Common stock sold by selling stockholders (in shares)	900,000	2,400,000
Public offering, shares issued price (in dollars per share) | $ / shares	$ 18.00