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Fair Value of Financial Instruments (Schedule of Fair Value of Financial Assets and Liabilities) (Details) - USD ($) $ in Thousands | Mar. 30, 2019 | Mar. 31, 2018
--- | --- | ---
Cash equivalents | Money market funds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of financial assets | $ 216,172 | $ 211,891
Cash equivalents | Money market funds | Quoted Prices in Active Markets for Identical Assets Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of financial assets | 216,172 | 211,891
Cash equivalents | Money market funds | Significant Other Observable Inputs Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of financial assets | 0 | 0
Cash equivalents | Money market funds | Significant Unobservable Inputs Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of financial assets | 0 | 0
Available-for-sale securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of financial assets | 229,151 | 198,896
Available-for-sale securities | Quoted Prices in Active Markets for Identical Assets Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of financial assets | 0 | 0
Available-for-sale securities | Significant Other Observable Inputs Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of financial assets | 229,151 | 198,896
Available-for-sale securities | Significant Unobservable Inputs Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of financial assets | 0 | 0
Available-for-sale securities | Corporate debt securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of financial assets | 215,525 | 183,322
Available-for-sale securities | Corporate debt securities | Quoted Prices in Active Markets for Identical Assets Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of financial assets | 0 | 0
Available-for-sale securities | Corporate debt securities | Significant Other Observable Inputs Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of financial assets | 215,525 | 183,322
Available-for-sale securities | Corporate debt securities | Significant Unobservable Inputs Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of financial assets | 0 | 0
Available-for-sale securities | Non-US government securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of financial assets | 13,177 | 14,619
Available-for-sale securities | Non-US government securities | Quoted Prices in Active Markets for Identical Assets Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of financial assets | 0 | 0
Available-for-sale securities | Non-US government securities | Significant Other Observable Inputs Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of financial assets | 13,177 | 14,619
Available-for-sale securities | Non-US government securities | Significant Unobservable Inputs Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of financial assets | 0 | 0
Available-for-sale securities | Certificates of deposit |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of financial assets |  | 500
Available-for-sale securities | Certificates of deposit | Quoted Prices in Active Markets for Identical Assets Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of financial assets |  | 0
Available-for-sale securities | Certificates of deposit | Significant Other Observable Inputs Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of financial assets |  | 500
Available-for-sale securities | Certificates of deposit | Significant Unobservable Inputs Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of financial assets |  | 0
Available-for-sale securities | Agency discount notes |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of financial assets | 449 | 455
Available-for-sale securities | Agency discount notes | Quoted Prices in Active Markets for Identical Assets Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of financial assets | 0 | 0
Available-for-sale securities | Agency discount notes | Significant Other Observable Inputs Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of financial assets | 449 | 455
Available-for-sale securities | Agency discount notes | Significant Unobservable Inputs Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of financial assets | $ 0 | $ 0

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