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Income Taxes (Schedule of Deferred Assets and Liabilities) (Details) - USD ($)
$ in Thousands
Dec. 28, 2018
Dec. 29, 2017
Deferred tax assets:    
Net operating loss carryforwards $ 146,701 $ 244,205
Tax credit carryforwards 98,467 66,770
Book over tax depreciation and amortization 29,929 39,472
Amortization of deferred stock compensation – non-qualified 11,366 8,966
Accruals and reserves not currently deductible 10,425 4,914
Deferred revenue 5,474 53,543
Other assets 1,140 1,088
Total deferred tax assets 303,502 418,958
Valuation allowance (58,112) (418,958)
Net deferred tax assets 245,390 0
Deferred tax liabilities:    
Operating lease right-of-use assets (1,279) 0
Total deferred tax liabilities (1,279) 0
Net deferred taxes $ 244,111 $ 0