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Income Taxes - Significant Components of Company's Deferred Tax Assets and Liabilities (Detail) - USD ($)
$ in Millions
Sep. 30, 2017
Sep. 24, 2016
Deferred tax assets    
Net operating loss carryforwards $ 50.1 $ 40.0
Capital losses 7.1 19.1
Non-deductible accruals 50.6 21.1
Non-deductible reserves 30.0 31.1
Stock-based compensation 39.3 34.8
Research and other credits 13.6 10.7
Nonqualified deferred compensation plan 16.4 14.1
Other temporary differences 16.5 9.2
Deferred tax assets, gross 223.6 180.1
Less: valuation allowance (28.2) (46.2)
Deferred tax assets, net 195.4 133.9
Deferred tax liabilities    
Depreciation and amortization (1,071.5) (1,030.8)
Debt discounts and deferrals (88.4) (76.4)
Deferred tax liabilities, net (1,159.9) (1,107.2)
Net deferred tax liabilities $ (964.5) $ (973.3)