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Income Taxes (Deferred Tax Assets and Liabilities) (Details) - USD ($)
 12 Months Ended
Dec. 28, 2018
Dec. 29, 2017
Income Tax Disclosure [Abstract]    
Deferred Tax Liabilities, Noncurrent assets of discontinued operations held for sale $ 0 $ 701,000
Deferred Tax Assets, Gross, Noncurrent 3,937,000 4,152,000
Deferred Tax Liabilities, Gross, Noncurrent 203,910,000 145,364,000
Deferred Income Tax Liabilities, Net (203,910,000.000) (140,964,000.000)
Deferred Tax Liabilities, Noncurrent liabilities of discontinued operations held for sale 0 (4,400,000)
Components of Deferred Tax Assets and Liabilities [Abstract]    
Net operating loss carryforwards 18,088,000 107,005,000
Tax credit carryforwards 24,593,000 28,215,000
Inventories 3,408,000 4,956,000
Accrued expenses 39,000 3,815,000
Stock-based compensation 2,340,000 5,531,000
Gross deferred tax assets 48,468,000 149,522,000
Less valuation allowance (34,339,000) (36,480,000)
Net deferred tax assets 14,129,000 113,042,000
Property, plant and equipment (9,445,000) (27,547,000)
Intangible assets (198,648,000) (219,576,000)
Convertible subordinated notes 0 (806,000)
Other (6,009,000) (6,325,000)
Gross deferred tax liabilities (214,102,000) (254,254,000)
Net deferred tax liability $ (199,973,000) $ (141,212,000)