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Marketable Securities (Tables) | 12 Months Ended
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Mar. 31, 2018
Marketable Securities [Abstract] |
Schedule of Available-for-sale Securities |
As of March 25, 2017 | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Estimated Fair Value (Net Carrying Amount)
Corporate debt securities | $ | 33,350 |  |  | $ | — |  |  | $ | (20 | ) |  | $ | 33,330 |
Commercial paper | 66,518 |  |  | — |  |  | (35 | ) |  | 66,483 |
Total securities | $ | 99,868 |  |  | $ | — |  |  | $ | (55 | ) |  | $ | 99,813 |
The following table is a summary of available-for-sale securities (in thousands):
As of March 31, 2018 | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Estimated Fair Value (Net Carrying Amount)
Corporate debt securities | $ | 185,636 |  |  | $ | 4 |  |  | $ | (2,318 | ) |  | $ | 183,322 |
Non-US government securities | 14,730 |  |  | — |  |  | (111 | ) |  | 14,619 |
Certificates of deposit | 500 |  |  | — |  |  | — |  |  | 500 |
Agency discount notes | 459 |  |  | — |  |  | (4 | ) |  | 455 |
Total securities | $ | 201,325 |  |  | $ | 4 |  |  | $ | (2,433 | ) |  | $ | 198,896 |
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 investments by contractual maturity were as follows:
| March 31, 2018 |  | March 25, 2017
| Amortized Cost |  | Estimated Fair Value |  | Amortized Cost |  | Estimated Fair Value
Within 1 year | $ | 26,560 |  |  | $ | 26,397 |  |  | $ | 99,868 |  |  | $ | 99,813 |
After 1 year | 174,765 |  |  | 172,499 |  |  | — |  |  | — |
Total | $ | 201,325 |  |  | $ | 198,896 |  |  | $ | 99,868 |  |  | $ | 99,813 |

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