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Cash, Cash Equivalents and Investments with Hierarchy (Details) - USD ($) $ in Thousands | Mar. 31, 2016 | Mar. 31, 2015 | Mar. 31, 2014 | Mar. 31, 2013
--- | --- | --- | --- | ---
Amortized Costs | $ 163,005 | $ 177,198 |  |
Gross Unrealized Gains | 89 | 71 |  |
Gross Unrealized Loss | (244) | (175) |  |
Estimated Fair Value | 162,850 | 177,094 |  |
Cash and cash equivalents | 33,576 | 53,110 | $ 59,159 | $ 50,305
Short-term marketable investments | 129,274 | 123,984 |  |
Liabilities, Fair Value Disclosure | 341 | 0 | $ 0 |
Aavailable-for-sale investments due within one year | 71,071 |  |  |
Aavailable-for-sale investments due after one year | 58,203 |  |  |
Level 1 |  |  |  |
Amortized Costs | 35,576 | 55,110 |  |
Gross Unrealized Gains | 0 | 0 |  |
Gross Unrealized Loss | (187) | (107) |  |
Estimated Fair Value | 35,389 | 55,003 |  |
Cash and cash equivalents | 33,576 | 53,110 |  |
Short-term marketable investments | 1,813 | 1,893 |  |
Level 2 |  |  |  |
Amortized Costs | 127,429 | 122,088 |  |
Gross Unrealized Gains | 89 | 71 |  |
Gross Unrealized Loss | (57) | (68) |  |
Estimated Fair Value | 127,461 | 122,091 |  |
Cash and cash equivalents | 0 | 0 |  |
Short-term marketable investments | 127,461 | 122,091 |  |
Level 3 |  |  |  |
Amortized Costs | 0 |  |  |
Gross Unrealized Gains | 0 |  |  |
Gross Unrealized Loss | 0 |  |  |
Estimated Fair Value | 341 |  |  |
Cash and cash equivalents | 0 |  |  |
Short-term marketable investments | 0 |  |  |
Liabilities, Fair Value Disclosure | 341 |  |  |
Cash |  |  |  |
Amortized Costs | 18,596 | 24,734 |  |
Gross Unrealized Gains | 0 | 0 |  |
Gross Unrealized Loss | 0 | 0 |  |
Estimated Fair Value | 18,596 | 24,734 |  |
Cash and cash equivalents | 18,596 | 24,734 |  |
Short-term marketable investments | 0 | 0 |  |
Money Market Funds | Level 1 |  |  |  |
Amortized Costs | 14,980 | 28,376 |  |
Gross Unrealized Gains | 0 | 0 |  |
Gross Unrealized Loss | 0 | 0 |  |
Estimated Fair Value | 14,980 | 28,376 |  |
Cash and cash equivalents | 14,980 | 28,376 |  |
Short-term marketable investments | 0 | 0 |  |
Mutual Funds | Level 1 |  |  |  |
Amortized Costs | 2,000 | 2,000 |  |
Gross Unrealized Gains | 0 | 0 |  |
Gross Unrealized Loss | (187) | (107) |  |
Estimated Fair Value | 1,813 | 1,893 |  |
Cash and cash equivalents | 0 | 0 |  |
Short-term marketable investments | 1,813 | 1,893 |  |
Commercial Paper | Level 2 |  |  |  |
Amortized Costs | 6,794 | 9,043 |  |
Gross Unrealized Gains | 2 | 1 |  |
Gross Unrealized Loss | 0 | 0 |  |
Estimated Fair Value | 6,796 | 9,044 |  |
Cash and cash equivalents | 0 | 0 |  |
Short-term marketable investments | 6,796 | 9,044 |  |
Corporate Debt | Level 2 |  |  |  |
Amortized Costs | 85,164 | 75,284 |  |
Gross Unrealized Gains | 78 | 57 |  |
Gross Unrealized Loss | (28) | (10) |  |
Estimated Fair Value | 85,214 | 75,331 |  |
Cash and cash equivalents | 0 | 0 |  |
Short-term marketable investments | 85,214 | 75,331 |  |
Municipal Securities | Level 2 |  |  |  |
Amortized Costs | 1,007 | 5,435 |  |
Gross Unrealized Gains | 0 | 2 |  |
Gross Unrealized Loss | (1) | (1) |  |
Estimated Fair Value | 1,006 | 5,436 |  |
Cash and cash equivalents | 0 | 0 |  |
Short-term marketable investments | 1,006 | 5,436 |  |
Asset-backed Securities | Level 2 |  |  |  |
Amortized Costs | 24,614 | 21,503 |  |
Gross Unrealized Gains | 7 | 4 |  |
Gross Unrealized Loss | (11) | (5) |  |
Estimated Fair Value | 24,610 | 21,502 |  |
Cash and cash equivalents | 0 | 0 |  |
Short-term marketable investments | 24,610 | 21,502 |  |
Mortgage backed Securities | Level 2 |  |  |  |
Amortized Costs | 2,045 | 5,822 |  |
Gross Unrealized Gains | 0 | 0 |  |
Gross Unrealized Loss | (17) | (52) |  |
Estimated Fair Value | 2,028 | 5,770 |  |
Cash and cash equivalents | 0 | 0 |  |
Short-term marketable investments | 2,028 | 5,770 |  |
Agency Bond | Level 2 |  |  |  |
Amortized Costs | 6,805 | 5,822 |  |
Gross Unrealized Gains | 1 | 0 |  |
Gross Unrealized Loss | 0 | (52) |  |
Estimated Fair Value | 6,806 | 5,770 |  |
Cash and cash equivalents | 0 | 0 |  |
Short-term marketable investments | 6,806 | 5,770 |  |
International Government Securities | Level 2 |  |  |  |
Amortized Costs | 1,000 | 800 |  |
Gross Unrealized Gains | 1 | 4 |  |
Gross Unrealized Loss | 0 | 0 |  |
Estimated Fair Value | 1,001 | 804 |  |
Cash and cash equivalents | 0 | 0 |  |
Short-term marketable investments | 1,001 | $ 804 |  |
Contingent Consideration | Level 3 |  |  |  |
Amortized Costs | 0 |  |  |
Gross Unrealized Gains | 0 |  |  |
Gross Unrealized Loss | 0 |  |  |
Estimated Fair Value | 341 |  |  |
Cash and cash equivalents | 0 |  |  |
Short-term marketable investments | 0 |  |  |
Liabilities, Fair Value Disclosure | $ 341 |  |  |

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