Investments and Fair Value Measurements (Details 2) (USD $) | Jun. 28, 2014 | Mar. 29, 2014 |
In Thousands, unless otherwise specified |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] | ' | ' |
Fair value of financial assets measured at fair value on a recurring basis | $143,022 | $184,015 |
Recurring [Member] | ' | ' |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] | ' | ' |
Fair value of financial assets measured at fair value on a recurring basis | 143,022 | 184,015 |
Recurring [Member] | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | ' | ' |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] | ' | ' |
Fair value of financial assets measured at fair value on a recurring basis | 140,872 | 181,865 |
Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | ' | ' |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] | ' | ' |
Fair value of financial assets measured at fair value on a recurring basis | 2,150 | 2,150 |
U.S. government/agency securities [Member] | ' | ' |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] | ' | ' |
Fair value of financial assets measured at fair value on a recurring basis | 102,064 | 133,065 |
U.S. government/agency securities [Member] | Recurring [Member] | ' | ' |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] | ' | ' |
Fair value of financial assets measured at fair value on a recurring basis | 102,064 | 133,065 |
U.S. government/agency securities [Member] | Recurring [Member] | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | ' | ' |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] | ' | ' |
Fair value of financial assets measured at fair value on a recurring basis | 102,064 | 133,065 |
Auction Rate Securities [Member] | ' | ' |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] | ' | ' |
Fair value of financial assets measured at fair value on a recurring basis | 2,150 | 2,150 |
Auction Rate Securities [Member] | Recurring [Member] | ' | ' |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] | ' | ' |
Fair value of financial assets measured at fair value on a recurring basis | 2,150 | 2,150 |
Auction Rate Securities [Member] | Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | ' | ' |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] | ' | ' |
Fair value of financial assets measured at fair value on a recurring basis | 2,150 | 2,150 |
Money Market Funds [Member] | ' | ' |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] | ' | ' |
Fair value of financial assets measured at fair value on a recurring basis | 38,808 | 48,800 |
Money Market Funds [Member] | Recurring [Member] | ' | ' |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] | ' | ' |
Fair value of financial assets measured at fair value on a recurring basis | 38,808 | 48,800 |
Money Market Funds [Member] | Recurring [Member] | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | ' | ' |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] | ' | ' |
Fair value of financial assets measured at fair value on a recurring basis | $38,808 | $48,800 |