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Income Taxes - Significant Components of Company's Deferred Tax Assets and Liabilities (Detail) - USD ($)
$ in Millions
Sep. 29, 2018
Sep. 30, 2017
Deferred tax assets    
Net operating loss carryforwards $ 30.9 $ 50.1
Capital losses 6.5 7.1
Non-deductible accruals 30.7 50.6
Non-deductible reserves 22.1 30.0
Stock-based compensation 24.0 39.3
Research and other credits 13.3 13.6
Nonqualified deferred compensation plan 12.3 16.4
Other temporary differences 11.5 16.5
Deferred tax assets, gross 151.3 223.6
Less: valuation allowance (25.5) (28.2)
Deferred tax assets, net 125.8 195.4
Deferred tax liabilities    
Depreciation and amortization (606.6) (1,071.5)
Debt discounts and deferrals (4.5) (88.4)
Deferred tax liabilities, net (611.1) (1,159.9)
Net deferred tax liabilities $ (485.3) $ (964.5)