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Income Taxes (Schedule Of Deferred Tax Assets And Liabilities) (Details) - USD ($)
$ in Millions
Dec. 30, 2016
Jan. 01, 2016
Income Tax Disclosure [Abstract]    
Purchased intangibles $ 91.9 $ 122.6
Depreciation and amortization 11.7 11.0
US residual tax on foreign earnings 11.3 12.2
Total deferred tax liabilities 114.9 145.8
Inventory valuation differences 12.9 11.5
Expenses not currently deductible 27.7 26.2
US federal tax credit carryforwards 0.3 0.6
Deferred revenue 6.9 6.6
US state tax credit carryforwards 15.1 16.4
Accrued warranty 3.1 3.4
US federal net operating loss carryforwards 3.8 5.5
Foreign net operating loss carryforwards 31.2 41.7
Stock-based compensation 31.9 29.6
Other 4.1 9.0
Total deferred tax assets 137.0 150.5
Valuation allowance (30.6) (34.9)
Total deferred tax assets 106.4 115.6
Total deferred tax liabilities (8.5) (30.2)
Non-current deferred income tax assets 30.3 21.5
Non-current deferred income tax liabilities $ (38.8) $ (51.7)