v2.4.0.8

Investments (Tables) | 6 Months Ended
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Sep. 30, 2014
Investments [Abstract] |
Summary of available-for-sale securities | The following is a summary of available-for-sale securities at September 30, 2014 (amounts in thousands):
| Available-for-sale Securities
| Adjusted Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Estimated Fair Value
Government agency bonds | $ | 668,639 |  |  | $ | 129 |  |  | $ | (2,560 | ) |  | $ | 666,208 |
Municipal bonds | 41,097 |  |  | 66 |  |  | (2 | ) |  | 41,161 |
Auction rate securities | 9,825 |  |  | — |  |  | — |  |  | 9,825 |
Time deposits (1) | 20,160 |  |  | — |  |  | — |  |  | 20,160 |
Corporate bonds and debt | 904,243 |  |  | 2,150 |  |  | (800 | ) |  | 905,593 |
| $ | 1,643,964 |  |  | $ | 2,345 |  |  | $ | (3,362 | ) |  | $ | 1,642,947 |
(1) Time deposits in various financial institutions with maturities greater than three months that will mature within one year. The following is a summary of available-for-sale securities at March 31, 2014 (amounts in thousands):
| Available-for-sale Securities
| Adjusted Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Estimated Fair Value
Government agency bonds | $ | 684,451 |  |  | $ | 114 |  |  | $ | (3,171 | ) |  | $ | 681,394 |
Municipal bonds | 41,622 |  |  | 101 |  |  | (14 | ) |  | 41,709 |
Auction rate securities | 9,825 |  |  | — |  |  | — |  |  | 9,825 |
Corporate bonds and debt | 941,524 |  |  | 3,247 |  |  | (805 | ) |  | 943,966 |
| $ | 1,677,422 |  |  | $ | 3,462 |  |  | $ | (3,990 | ) |  | $ | 1,676,894 |
Summary of amortized cost and estimated fair value of available-for-sale securities, by maturity | The amortized cost and estimated fair value of the available-for-sale securities at September 30, 2014, by contractual maturity, excluding corporate debt of $6.2 million, which has no contractual maturity, are shown below (amounts in thousands). Expected maturities can differ from contractual maturities because the issuers of the securities may have the right to prepay obligations without prepayment penalties, and the Company views its available-for-sale securities as available for current operations.
| Adjusted Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Estimated Fair Value
Available-for-sale |  |  |  |  |  |  |
Due in one year or less | $ | 250,615 |  |  | $ | 742 |  |  | $ | (5 | ) |  | $ | 251,352 |
Due after one year and through five years | 1,264,898 |  |  | 1,552 |  |  | (2,227 | ) |  | 1,264,223 |
Due after five years and through ten years | 112,436 |  |  | 51 |  |  | (1,130 | ) |  | 111,357 |
Due after ten years | 9,825 |  |  | — |  |  | — |  |  | 9,825 |
| $ | 1,637,774 |  |  | $ | 2,345 |  |  | $ | (3,362 | ) |  | $ | 1,636,757 |

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- Definition Tabular disclosure of available-for-sale securities which includes, but is not limited to, changes in the cost basis and fair value, fair value and gross unrealized gain (loss), fair values by type of security, contractual maturity and classification, amortized cost basis, contracts to acquire securities to be accounted for as available-for-sale, debt maturities, transfers to trading, change in net unrealized holding gain (loss) net of tax, continuous unrealized loss position fair value, aggregate losses qualitative disclosures, other than temporary impairment (OTTI) losses or other disclosures related to available for sale securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27357-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27337-111563 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62557-112803 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27198-111563 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62586-112803 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 + Details
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- Definition Tabular disclosure of maturities of an entity's investments as well as any other information pertinent to the investments. + References No definition available. + Details
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