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Financial Instruments and Fair Value Measurements - Contractual Maturities of Debt Investments (Detail) (USD $)
In Millions, unless otherwise specified
Jan. 23, 2015
Investments Debt And Equity Securities [Abstract]  
Due in one year or less, Amortized Cost $ 1,479.8us-gaap_AvailableForSaleSecuritiesDebtMaturitiesNextRollingTwelveMonthsAmortizedCostBasis
Due in two through five years, Amortized Cost 1,498.5us-gaap_AvailableForSaleSecuritiesDebtMaturitiesRollingYearTwoThroughFiveAmortizedCostBasis
Total, Amortized Cost 2,978.3us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis
Due in one year or less, Estimated Fair Value 1,482.0us-gaap_AvailableForSaleSecuritiesDebtMaturitiesNextRollingTwelveMonthsFairValue
Due in two through five years, Estimated Fair Value 1,503.8us-gaap_AvailableForSaleSecuritiesDebtMaturitiesRollingYearTwoThroughFiveFairValue
Total, Estimated Fair Value $ 2,985.8us-gaap_AvailableForSaleSecuritiesDebtSecurities