SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Impact of Change from LIFO to FIFO on Balance Sheet (Details) - USD ($) $ in Thousands	Sep. 26, 2020	Dec. 28, 2019
Change in Accounting Estimate [Line Items]
Inventory	$ 448,088	$ 418,370
Deferred income tax liability	51,280	58,906
Retained earnings	$ 2,219,182	2,173,802
As Previously Reported
Change in Accounting Estimate [Line Items]
Inventory		374,565
Deferred income tax liability		47,955
Retained earnings		2,140,948
Adjustment
Change in Accounting Estimate [Line Items]
Inventory		43,805
Deferred income tax liability		10,951
Retained earnings		$ 32,854