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Marketable Securities (Tables) | 3 Months Ended
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Jun. 27, 2020
Marketable Securities [Abstract] |
Schedule of Available-for-sale Securities | The following table is a summary of available-for-sale securities at June 27, 2020 (in thousands):
As of June 27, 2020 | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Estimated Fair Value (Net Carrying Amount)
Corporate debt securities | $ | 294,015 |  |  | $ | 6,727 |  |  | $ | (72) |  |  | $ | 300,670 |
Non-U.S. government securities | 12,879 |  |  | 316 |  |  | — |  |  | 13,195 |
U.S. Treasury securities | 5,267 |  |  | 108 |  |  | — |  |  | 5,375 |
Agency discount notes | 889 |  |  | — |  |  | — |  |  | 889 |
Total securities | $ | 313,050 |  |  | $ | 7,151 |  |  | $ | (72) |  |  | $ | 320,129 |
The Company typically invests in highly-rated securities with original maturities generally ranging from one to three years. The Company's specifically identified gross unrealized loss of $0.1 million related to securities with total amortized costs of approximately $7.7 million at June 27, 2020. There were no securities that had been in a continuous unrealized loss position for more than 12 months as of June 27, 2020. The Company may sell certain of its marketable securities prior to their stated maturities for strategic reasons including, but not limited to, anticipated or actual changes in credit rating and duration management. The Company records an allowance for credit loss when a decline in investment market value is due to credit-related factors. When evaluating an investment for impairment, the Company reviews factors including the length of time and extent to which fair value has been below cost basis, the financial condition of the issuer, changes in market interest rates and whether it is more likely than not the Company will be required to sell the investment before recovery of the investment’s cost basis. As of June 27, 2020, the Company does not consider any of its investments to be impaired. The following table is a summary of available-for-sale securities at March 28, 2020 (in thousands): ໿ ໿
As of March 28, 2020 | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Estimated Fair Value (Net Carrying Amount)
Corporate debt securities | $ | 286,668 |  |  | $ | 1,157 |  |  | $ | (3,993) |  |  | $ | 283,832 |
Non-U.S. government securities | 12,483 |  |  | 260 |  |  | — |  |  | 12,743 |
U.S. Treasury securities | 8,839 |  |  | 167 |  |  | — |  |  | 9,006 |
Total securities | $ | 307,990 |  |  | $ | 1,584 |  |  | $ | (3,993) |  |  | $ | 305,581 |
Schedule of Cost and Estimated Fair Value of Available-for-sale Securities by Contractual Maturity | The cost and estimated fair value of available-for-sale securities by contractual maturities were as follows (in thousands): ໿
| June 27, 2020 |  |  |  | March 28, 2020 |  |
| Amortized |  | Estimated |  | Amortized |  | Estimated
| Cost |  | Fair Value |  | Cost |  | Fair Value
Within 1 year | $ | 29,447 |  |  | $ | 29,943 |  |  | $ | 22,012 |  |  | $ | 22,008 |
After 1 year | 283,603 |  |  | 290,186 |  |  | 285,978 |  |  | 283,573 |
Total | $ | 313,050 |  |  | $ | 320,129 |  |  | $ | 307,990 |  |  | $ | 305,581 |

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