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Financial Instruments (Details 4) - USD ($) $ in Millions | Dec. 29, 2018 | Mar. 31, 2018
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2.125% Senior Notes [Member] |  |
Schedule of Fair Value Hedging Adjustments [Line Items] |  |
Senior Notes, Carrying Value | $ 0.0 | $ 298.1
Cumulative amount of fair value hedging adjustment included in carrying value of hedged item |  | (1.6)
2.625% Senior Notes [Member] |  |
Schedule of Fair Value Hedging Adjustments [Line Items] |  |
Senior Notes, Carrying Value | 291.2 | 288.0
Cumulative amount of fair value hedging adjustment included in carrying value of hedged item | $ (8.0) | $ (10.8)

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- Definition Fair value of all derivatives designated as interest rate fair value hedging instruments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 + Details
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- Definition Carrying value as of the balance sheet date of uncollateralized debt obligation (with maturities initially due after one year or beyond the operating cycle if longer), excluding current portion. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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