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SHAREHOLDERS' EQUITY (Details) - USD ($) $ / shares in Units, $ in Thousands			4 Months Ended	12 Months Ended
	Jul. 02, 2020	Feb. 28, 2020	Jul. 02, 2020	Dec. 27, 2020	Dec. 29, 2019	Dec. 30, 2018	Oct. 16, 2019	Sep. 15, 2017
Class of Stock [Line Items]
Purchases and retirement of common stock				$ 52,346	$ 38,826	$ 34,818
Treasury stock acquired, average cost per share (in usd per share)			$ 14.40	$ 15.85
Preferred stock, shares authorized (in shares)				20,000,000	20,000,000
Common stock
Class of Stock [Line Items]
Unvested restricted stock included in shares outstanding (in shares)				900,000	800,000
Stock repurchase program, authorized amount							$ 100,000	$ 100,000
Purchases and retirement of common stock		$ 40,000
Purchases and retirement of common stock	626,948	2,150,538	2,777,486	779,068
Remaining authorized repurchase amount				$ 66,700

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Equity impact of the value of stock that has been repurchased and retired during the period. The excess of the purchase price over par value can be charged against retained earnings (once the excess is fully allocated to additional paid in capital).

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