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Income Taxes - Additional Information (Detail) - USD ($)
 12 Months Ended
Sep. 30, 2017
Sep. 24, 2016
Income Taxes [Line Items]    
Decrease in valuation allowance $ 18,000,000  
Federal net operating loss expected to be expired unutilized 4,500,000  
State net operating loss expected to be expired unutilized 117,900,000  
Foreign net operating loss expected to be expired unutilized 45,400,000  
Gross unrecognized tax benefits, excluding interest 90,300,000 $ 163,600,000
Unrecognized tax benefit that would impact effective tax rate 70,300,000 76,900,000
Unrecognized tax benefits, period decrease 73,300,000  
Interest accrued on unrecognized tax benefits 5,300,000 $ 13,100,000
Income tax penalties accrued 0  
Payments for other taxes 1,700,000  
Recognized tax benefit due to reversal of unrecognized tax benefit 10,900,000  
Unremitted foreign earnings 309,500,000  
Non-income tax loss 35,600,000  
General and Administrative Expense [Member]    
Income Taxes [Line Items]    
Income tax refund (12,400,000)  
Convertible Debt Securities [Member]    
Income Taxes [Line Items]    
Unrecognized tax benefits, period decrease (64,000,000)  
Settlement with Taxing Authority [Member]    
Income Taxes [Line Items]    
Unrecognized tax benefits, period decrease (9,300,000)  
Net Operating Losses Carryforwards [Member]    
Income Taxes [Line Items]    
Amount with unlimited carry forward periods 33,700,000  
Tax Credit Carryforward [Member]    
Income Taxes [Line Items]    
Amount with unlimited carry forward periods 2,200,000  
Maximum    
Income Taxes [Line Items]    
Decrease in unrecognized tax benefits is reasonably possible 2,000,000  
Domestic Tax Authority [Member]    
Income Taxes [Line Items]    
Net operating losses 64,300,000  
Credit carry forwards 5,200,000  
State and Local Jurisdiction [Member]    
Income Taxes [Line Items]    
Net operating losses 91,400,000  
Credit carry forwards 10,300,000  
Foreign Tax Authority [Member]    
Income Taxes [Line Items]    
Net operating losses 36,500,000  
Credit carry forwards $ 5,800,000