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Marketable Securities | 12 Months Ended
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Mar. 31, 2018
Marketable Securities [Abstract] |
Marketable Securities | Marketable Securities The Company’s investments have been classified as available-for-sale securities in accordance with U.S. GAAP. Marketable securities are categorized on the Consolidated Balance Sheet as “Marketable securities” within the short-term or long-term classification, as appropriate. 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 |
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 $2.4 million related to securities with a total amortized cost of approximately $198.2 million at March 31, 2018. No securities had been in a continuous unrealized loss position for more than 12 months as of March 31, 2018. 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. When evaluating an investment for other-than-temporary 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 March 31, 2018, the Company does not consider any of its investments to be other-than-temporarily impaired.
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 Company’s specifically identified gross unrealized losses of $55 thousand related to securities with a total amortized cost of approximately $99.9 million at March 25, 2017. Four securities had been in a continuous unrealized loss position for more than 12 months as of March 25, 2017. The gross unrealized loss on these securities was less than one tenth of one percent of the position value. 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. When evaluating an investment for other-than-temporary 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 March 25, 2017, the Company did not consider any of its investments to be other-than-temporarily impaired. 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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- Definition The entire disclosure for investments in certain debt and equity securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -URI http://asc.fasb.org/topic&trid=2196928 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=4738149 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2176304 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2324412 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2209399 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 954 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2289146 + Details
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