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LEASES (Details) - USD ($)
Sep. 27, 2020
Sep. 21, 2020
Jun. 28, 2020
[1]
Guarantor Obligations [Line Items]      
Restricted cash and investments $ 253,458,000   $ 253,911,000
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] us-gaap:PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization    
Finance Lease, Liability, Current, Statement of Financial Position [Extensible List] us-gaap:LongTermDebtAndCapitalLeaseObligationsCurrent    
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] us-gaap:LongTermDebtAndCapitalLeaseObligations    
California Facility Leases      
Guarantor Obligations [Line Items]      
Lease renewal term   7 years  
Right of use assets   $ 31,400,000  
Finance lease obligations   29,800,000  
Finance lease obligations, current   $ 3,100,000  
California Facility Leases | Maximum      
Guarantor Obligations [Line Items]      
Residual value of operating lease, maximum $ 298,400,000    
Operating Lease Cash Collateral      
Guarantor Obligations [Line Items]      
Restricted cash and investments $ 250,000,000.0    
[1] Derived from audited financial statements