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Fair Value of Financial Instruments (Schedule of Fair Value of Financial Assets and Liabilities) (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Mar. 25, 2017
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of financial assets |  | $ 22,143
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 |  | 160
Significant Other Observable Inputs Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of financial assets |  | 21,983
Significant Unobservable Inputs Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of financial assets |  | 0
Other accrued liabilities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of financial liabilities |  | 4,695
Other accrued liabilities | 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 liabilities |  | 0
Other accrued liabilities | Significant Other Observable Inputs Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of financial liabilities |  | 0
Other accrued liabilities | Significant Unobservable Inputs Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of financial liabilities |  | 4,695
Cash equivalents | Money market funds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of financial assets | $ 211,891 | 313,982
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 | 211,891 | 313,982
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 | 198,896 | 99,813
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 | 198,896 | 99,813
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 | 183,322 | 33,330
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 | 183,322 | 33,330
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 | 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 |
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 | 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 |
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 | 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 |
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 | 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 |
Available-for-sale securities | Commercial paper |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of financial assets |  | 66,483
Available-for-sale securities | Commercial paper | 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 | Commercial paper | Significant Other Observable Inputs Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of financial assets |  | 66,483
Available-for-sale securities | Commercial paper | Significant Unobservable Inputs Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of financial assets |  | $ 0

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