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SHORT-TERM INVESTMENTS (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Mar. 31, 2019
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Cost or Amortized Cost | $ 741,301 | $ 743,892
Gross Unrealized Gain | 1,329 | 769
Gross Unrealized Losses | (17) | (176)
Fair Value | 742,613 | 744,485
Bank-time deposits |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cost or Amortized Cost | 381,000 | 387,720
Gross Unrealized Gain | 0 | 0
Gross Unrealized Losses | 0 | 0
Fair Value | 381,000 | 387,720
Corporate bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cost or Amortized Cost | 272,758 | 295,526
Gross Unrealized Gain | 1,286 | 742
Gross Unrealized Losses | (17) | (127)
Fair Value | 274,027 | 296,141
US Treasuries |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cost or Amortized Cost | 28,898 | 55,656
Gross Unrealized Gain | 43 | 27
Gross Unrealized Losses | 0 | (49)
Fair Value | 28,941 | 55,634
Commercial paper |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cost or Amortized Cost | 58,645 | 4,990
Gross Unrealized Gain | 0 |
Gross Unrealized Losses | 0 |
Fair Value | $ 58,645 | $ 4,990

X
- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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- Definition Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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- Definition Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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