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Income Taxes - Additional Information (Detail) - USD ($)
 1 Months Ended 3 Months Ended 12 Months Ended
Jan. 31, 2018
Sep. 29, 2018
Dec. 30, 2017
Sep. 29, 2018
Sep. 30, 2017
Income Taxes [Line Items]          
Additional estimated net income tax benefit       $ 346,200,000  
Decrease in valuation allowance       2,700,000  
Federal net operating loss expected to be expired unutilized   $ 4,500,000   4,500,000  
State net operating loss expected to be expired unutilized   85,100,000   85,100,000  
Foreign net operating loss expected to be expired unutilized   46,400,000   46,400,000  
Gross unrecognized tax benefits, excluding interest   89,500,000   89,500,000 $ 90,300,000
Unrecognized tax benefit that would impact effective tax rate   79,000,000   79,000,000 70,300,000
Unrecognized tax benefits, period decrease       (800,000)  
Interest accrued on unrecognized tax benefits   9,000,000   9,000,000 $ 5,300,000
Income tax penalties accrued   0   0  
Payments for other taxes       1,700,000  
Recognized tax benefit due to reversal of unrecognized tax benefit       10,900,000  
Non-income tax loss       35,600,000  
Effective Income Tax Rate Reconciliation, Tax Settlement, State and Local, Amount $ 11,000,000        
Reduction in tax benefit   8,000,000      
General and Administrative Expense          
Income Taxes [Line Items]          
Non-income tax loss     $ (4,000,000)    
Income tax refund   12,400,000   12,400,000  
Convertible Debt Securities          
Income Taxes [Line Items]          
Unrecognized tax benefits, period decrease       10,400,000  
Settlement with Taxing Authority          
Income Taxes [Line Items]          
Unrecognized tax benefits, period decrease       9,600,000  
Net Operating Losses Carryforwards          
Income Taxes [Line Items]          
Amount with unlimited carry forward periods       34,500,000  
Tax Credit Carryforward          
Income Taxes [Line Items]          
Amount with unlimited carry forward periods       2,000,000  
Maximum          
Income Taxes [Line Items]          
Decrease in unrecognized tax benefits is reasonably possible   4,800,000   4,800,000  
Domestic Tax Authority          
Income Taxes [Line Items]          
Net operating losses   9,800,000   9,800,000  
Credit carry forwards   4,600,000   4,600,000  
State and Local Jurisdiction          
Income Taxes [Line Items]          
Net operating losses   46,900,000   46,900,000  
Credit carry forwards   9,400,000   9,400,000  
Foreign Tax Authority          
Income Taxes [Line Items]          
Net operating losses   35,900,000   35,900,000  
Credit carry forwards   $ 1,200,000   $ 1,200,000