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Financial Instruments and Fair Value Measurements (Tables) | 9 Months Ended
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Jan. 23, 2015
Investments Debt And Equity Securities [Abstract] |
Summary of Investments | The following is a summary of our investments (in millions):
|  | January 23, 2015 |  |  | April 25, 2014 |
|  |  |  |  |  | Gross Unrealized |  |  |  |  |  |  |  |  |  |  | Gross Unrealized |  |  |  |  |
|  | Cost or Amortized Cost |  |  | Gains |  |  | Losses |  |  | Estimated Fair Value |  |  | Cost or Amortized Cost |  |  | Gains |  |  | Losses |  |  | Estimated Fair Value |
Corporate bonds |  | $ | 2,083.9 |  |  | $ | 6.6 |  |  | $ | (0.4 | ) |  |  | 2,090.1 |  |  | $ | 2,142.3 |  |  | $ | 10.5 |  |  | $ | (0.5 | ) |  | $ | 2,152.3 |
U.S. Treasury and government debt securities |  |  | 521.4 |  |  |  | 1.4 |  |  |  | (0.1 | ) |  |  | 522.7 |  |  |  | 263.4 |  |  |  | 0.3 |  |  |  | (0.1 | ) |  |  | 263.6 |
Commercial paper |  |  | 15.0 |  |  |  | — |  |  |  | — |  |  |  | 15.0 |  |  |  | 168.4 |  |  |  | — |  |  |  | — |  |  |  | 168.4 |
Certificates of deposit |  |  | 358.0 |  |  |  | — |  |  |  | — |  |  |  | 358.0 |  |  |  | 245.0 |  |  |  | — |  |  |  | — |  |  |  | 245.0 |
Auction rate securities |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 36.9 |  |  |  | — |  |  |  | (0.9 | ) |  |  | 36.0 |
Equity funds |  |  | 30.4 |  |  |  | — |  |  |  | — |  |  |  | 30.4 |  |  |  | 32.7 |  |  |  | — |  |  |  | — |  |  |  | 32.7 |
Total debt and equity securities |  | $ | 3,008.7 |  |  | $ | 8.0 |  |  | $ | (0.5 | ) |  | $ | 3,016.2 |  |  | $ | 2,888.7 |  |  | $ | 10.8 |  |  | $ | (1.5 | ) |  | $ | 2,898.0 |
Contractual Maturities of Debt Investments | The following table presents the contractual maturities of our debt investments as of January 23, 2015 (in millions):
|  | Amortized Cost |  |  | Fair Value |
Due in one year or less |  | $ | 1,479.8 |  |  | $ | 1,482.0 |
Due in two through five years |  |  | 1,498.5 |  |  |  | 1,503.8 |
|  | $ | 2,978.3 |  |  | $ | 2,985.8 |
Summary of Financial Assets and Liabilities Measured at Fair Value on Recurring Basis | The following table summarizes our financial assets and liabilities measured at fair value on a recurring basis (in millions):
|  | January 23, 2015 |
|  |  |  |  |  | Fair Value Measurements at Reporting Date Using |
|  |  |  |  |  | Quoted Prices |  |  | Significant |
|  |  |  |  |  | in Active Markets |  |  | Other |
|  |  |  |  |  | for Identical Assets |  |  | Observable Inputs |
|  | Total |  |  | (Level 1) |  |  | (Level 2) |
Assets |  |  |  |  |  |  |  |  |  |  |  |
Corporate bonds |  | $ | 2,090.1 |  |  | $ | — |  |  | $ | 2,090.1 |
U.S. Treasury and government debt securities |  |  | 522.7 |  |  |  | 140.4 |  |  |  | 382.3 |
Commercial paper |  |  | 15.0 |  |  |  | — |  |  |  | 15.0 |
Certificates of deposit |  |  | 358.0 |  |  |  | — |  |  |  | 358.0 |
Equity funds |  |  | 30.4 |  |  |  | 30.4 |  |  |  | — |
Foreign currency contracts |  |  | 21.5 |  |  |  | — |  |  |  | 21.5 |
Total |  | $ | 3,037.7 |  |  | $ | 170.8 |  |  | $ | 2,866.9 |
Liabilities |  |  |  |  |  |  |  |  |  |  |  |
Foreign currency contracts |  | $ | (6.9 | ) |  | $ | — |  |  | $ | (6.9 | )
Assets and Liabilities Measured at Fair Value on Recurring Basis | The following table summarizes the balance sheet classifications of our financial assets and liabilities measured at fair value on a recurring basis (in millions):
|  | January 23, 2015 |
|  |  |  |  |  | Fair Value Measurements at Reporting Date Using |
|  |  |  |  |  | Quoted Prices |  |  | Significant |
|  |  |  |  |  | in Active Markets |  |  | Other |
|  |  |  |  |  | for Identical Assets |  |  | Observable Inputs |
|  | Total |  |  | (Level 1) |  |  | (Level 2) |
Assets |  |  |  |  |  |  |  |  |  |  |  |
Cash equivalents |  | $ | 273.0 |  |  | $ | — |  |  | $ | 273.0 |
Short-term investments |  |  | 2,712.8 |  |  |  | 140.4 |  |  |  | 2,572.4 |
Other current assets |  |  | 24.4 |  |  |  | 2.9 |  |  |  | 21.5 |
Other non-current assets |  |  | 27.5 |  |  |  | 27.5 |  |  |  | — |
Total |  | $ | 3,037.7 |  |  | $ | 170.8 |  |  | $ | 2,866.9 |
Liabilities |  |  |  |  |  |  |  |  |  |  |  |
Other current liabilities |  | $ | (6.9 | ) |  | $ | — |  |  | $ | (6.9 | )
Reconciliation of Beginning and Ending Balance of Level 3 Auction Rate Securities Measured at Fair Value on Recurring Basis | The table below provides a reconciliation of the beginning and ending balance of our Level 3 ARSs (in millions).
|  | Three Months Ended |  |  | Nine Months Ended |
|  | January 23, 2015 |  |  | January 24, 2014 |  |  | January 23, 2015 |  |  | January 24, 2014 |
Balance at beginning of period |  | $ | 23.0 |  |  | $ | 39.5 |  |  | $ | 36.0 |  |  | $ | 42.0 |
Total unrealized gains, net included in other comprehensive income (loss) |  |  | 0.3 |  |  |  | 0.9 |  |  |  | 0.9 |  |  |  | 0.7 |
Total realized gains included in earnings |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 0.7 |
Sales |  |  | — |  |  |  | — |  |  |  | (10.0 | ) |  |  | (3.0 | )
Settlements |  |  | (23.3 | ) |  |  | — |  |  |  | (26.9 | ) |  |  | — |
Balance at end of period |  | $ | — |  |  | $ | 40.4 |  |  | $ | — |  |  | $ | 40.4 |

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