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SHORT-TERM INVESTMENTS (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Mar. 31, 2017
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Cost or Amortized Cost | $ 548,034 | $ 448,941
Gross Unrealized Gain | 33 | 226
Gross Unrealized Loss | (738) | (235)
Fair Value | 547,329 | 448,932
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Rolling Maturity [Abstract] |  |
Amortized cost, Due in 1 year or less | 371,567 |
Amortized cost, Due in 1-2 years | 176,467 |
Total amortized cost | 548,034 |
Available-for-sale Securities, Debt Maturities, Fair Value, Rolling Maturity [Abstract] |  |
Fair value, Due in 1 year or less | 371,489 |
Fair value, Due in 1-2 years | 175,840 |
Total fair value | 547,329 |
Bank time deposits |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost or Amortized Cost | 166,321 | 175,745
Gross Unrealized Gain | 0 | 0
Gross Unrealized Loss | 0 | 0
Fair Value | 166,321 | 175,745
Corporate bonds |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost or Amortized Cost | 363,127 | 243,140
Gross Unrealized Gain | 18 | 98
Gross Unrealized Loss | (729) | (219)
Fair Value | 362,416 | 243,019
Commercial paper |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost or Amortized Cost | 13,921 | 25,938
Gross Unrealized Gain | 0 | 5
Gross Unrealized Loss | 0 | (7)
Fair Value | 13,921 | 25,936
Mutual funds |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost or Amortized Cost | 4,665 | 4,118
Gross Unrealized Gain | 15 | 123
Gross Unrealized Loss | (9) | (9)
Fair Value | $ 4,671 | $ 4,232

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- Definition Amount of available-for-sale debt securities at cost, net of adjustments, maturing in the first rolling twelve months through the second rolling twelve months following the latest balance sheet presented. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings (less any cumulative-effect adjustments, as defined) and fair value hedge accounting adjustments. + References No definition available. + Details
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- Definition This item represents the cost of debt securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27161-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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