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SHORT-TERM INVESTMENTS | 9 Months Ended
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Dec. 31, 2017
Investments, Debt and Equity Securities [Abstract] |
SHORT-TERM INVESTMENTS | SHORT-TERM INVESTMENTS Our short-term investments consisted of the following:
| December 31, 2017
|  |  | Gross Unrealized |  |
| Cost or Amortized Cost |  | Gains |  | Losses |  | Fair Value
Short-term investments |  |  |  |  |  |  |  |  |  |  |
Bank time deposits | $ | 166,321 |  |  | $ | — |  |  | $ | — |  |  | $ | 166,321 |
Available-for-sale securities: |  |  |  |  |  |  |  |  |  |  |
Corporate bonds | 363,127 |  |  | 18 |  |  | (729 | ) |  | 362,416 |
Commercial paper | 13,921 |  |  | — |  |  | — |  |  | 13,921 |
Mutual funds | 4,665 |  |  | 15 |  |  | (9 | ) |  | 4,671 |
Total short-term investments | $ | 548,034 |  |  | $ | 33 |  |  | $ | (738 | ) |  | $ | 547,329 |
| March 31, 2017
|  |  | Gross Unrealized |  |
| Cost or Amortized Cost |  | Gains |  | Losses |  | Fair Value
Short-term investments |  |  |  |  |  |  |  |  |  |  |
Bank time deposits | $ | 175,745 |  |  | $ | — |  |  | $ | — |  |  | $ | 175,745 |
Available-for-sale securities: |  |  |  |  |  |  |  |  |  |  |
Corporate bonds | 243,140 |  |  | 98 |  |  | (219 | ) |  | 243,019 |
Commercial paper | 25,938 |  |  | 5 |  |  | (7 | ) |  | 25,936 |
Mutual funds | 4,118 |  |  | 123 |  |  | (9 | ) |  | 4,232 |
Total short-term investments | $ | 448,941 |  |  | $ | 226 |  |  | $ | (235 | ) |  | $ | 448,932 |
Based on our review of investments with unrealized losses, we did not consider these investments to be other-than-temporarily impaired as of December 31, 2017 or March 31, 2017. The following table summarizes the contracted maturities of our short-term investments at December 31, 2017:
| December 31, 2017
| Amortized Cost |  | Fair Value
Short-term investments |  |  |  |  |
Due in 1 year or less | $ | 371,567 |  |  | $ | 371,489 |
Due in 1 - 2 years | 176,467 |  |  | 175,840 |
Total short-term investments | $ | 548,034 |  |  | $ | 547,329 |

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