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Income Taxes - Significant Components of Company's Deferred Tax Assets and Liabilities (Detail) (USD $)
In Millions, unless otherwise specified
Sep. 27, 2014
Sep. 28, 2013
Deferred tax assets    
Net operating loss carryforwards $ 54.2 $ 49.3
Capital losses 22.3 23.8
Non-deductible accruals 16.8 21.5
Non-deductible reserves 27.1 16.1
Stock-based compensation 25.0 30.2
Research and other credits 12.3 10.7
Nonqualified deferred compensation plan 13.7 14.7
Other temporary differences 11.6 7.0
Deferred tax assets, gross 183.0 173.3
Less: valuation allowance (62.8) (43.4)
Deferred tax assets, net 120.2 129.9
Deferred tax liabilities    
Depreciation and amortization (1,314.6) (1,494.1)
Debt discounts and deferrals (120.9) (189.3)
Debt issuance costs (6.8) (10.9)
Investment in subsidiary (13.9) (10.7)
Deferred tax liabilities, net (1,456.2) (1,705.0)
Net deferred tax liabilities $ (1,336.0) $ (1,575.1)