FAIR VALUE MEASUREMENTS - ASSETS MEASURED AT FAIR VALUE (Details) - USD ($) $ in Thousands | Jun. 30, 2020 | Mar. 31, 2020 |
Assets measured at fair value on a recurring basis | | |
Short-term investments | $ 880,825 | $ 644,003 |
Total recurring fair value measurements, net | 2,486,105 | 2,212,804 |
Money market funds | | |
Assets measured at fair value on a recurring basis | | |
Cash and cash equivalents | 498,644 | 497,861 |
Restricted cash and cash equivalents | 467,298 | 546,604 |
Long-term restricted cash and cash equivalents | 289,526 | 89,124 |
Bank-time deposits | | |
Assets measured at fair value on a recurring basis | | |
Cash and cash equivalents | 213,000 | 313,757 |
Restricted cash and cash equivalents | 324 | |
Short-term investments | 352,026 | 191,000 |
Commercial paper | | |
Assets measured at fair value on a recurring basis | | |
Cash and cash equivalents | 94,105 | 97,544 |
Short-term investments | 97,910 | 87,553 |
Corporate bonds | | |
Assets measured at fair value on a recurring basis | | |
Cash and cash equivalents | 37,261 | 9,888 |
Short-term investments | 401,198 | 334,631 |
US Treasuries | | |
Assets measured at fair value on a recurring basis | | |
Short-term investments | 28,684 | 30,819 |
Asset-backed securities | | |
Assets measured at fair value on a recurring basis | | |
Short-term investments | 1,007 | |
Cross-currency swap | | |
Assets measured at fair value on a recurring basis | | |
Prepaid expenses and other | | 11,275 |
Private equity | | |
Assets measured at fair value on a recurring basis | | |
Private equity | 5,364 | 2,759 |
Foreign currency forward contracts | | |
Assets measured at fair value on a recurring basis | | |
Foreign currency forward contracts | (242) | (11) |
Quoted prices in active markets for identical assets (level 1) | | |
Assets measured at fair value on a recurring basis | | |
Total recurring fair value measurements, net | 1,849,502 | 1,669,165 |
Quoted prices in active markets for identical assets (level 1) | Money market funds | | |
Assets measured at fair value on a recurring basis | | |
Cash and cash equivalents | 498,644 | 497,861 |
Restricted cash and cash equivalents | 467,298 | 546,604 |
Long-term restricted cash and cash equivalents | 289,526 | 89,124 |
Quoted prices in active markets for identical assets (level 1) | Bank-time deposits | | |
Assets measured at fair value on a recurring basis | | |
Cash and cash equivalents | 213,000 | 313,757 |
Restricted cash and cash equivalents | 324 | |
Short-term investments | 352,026 | 191,000 |
Quoted prices in active markets for identical assets (level 1) | Commercial paper | | |
Assets measured at fair value on a recurring basis | | |
Cash and cash equivalents | 0 | 0 |
Short-term investments | 0 | 0 |
Quoted prices in active markets for identical assets (level 1) | Corporate bonds | | |
Assets measured at fair value on a recurring basis | | |
Cash and cash equivalents | 0 | 0 |
Short-term investments | 0 | 0 |
Quoted prices in active markets for identical assets (level 1) | US Treasuries | | |
Assets measured at fair value on a recurring basis | | |
Short-term investments | 28,684 | 30,819 |
Quoted prices in active markets for identical assets (level 1) | Asset-backed securities | | |
Assets measured at fair value on a recurring basis | | |
Short-term investments | 0 | |
Quoted prices in active markets for identical assets (level 1) | Cross-currency swap | | |
Assets measured at fair value on a recurring basis | | |
Prepaid expenses and other | | 0 |
Quoted prices in active markets for identical assets (level 1) | Private equity | | |
Assets measured at fair value on a recurring basis | | |
Private equity | 0 | 0 |
Quoted prices in active markets for identical assets (level 1) | Foreign currency forward contracts | | |
Assets measured at fair value on a recurring basis | | |
Foreign currency forward contracts | 0 | 0 |
Significant other observable inputs (level 2) | | |
Assets measured at fair value on a recurring basis | | |
Total recurring fair value measurements, net | 631,239 | 540,880 |
Significant other observable inputs (level 2) | Money market funds | | |
Assets measured at fair value on a recurring basis | | |
Cash and cash equivalents | 0 | 0 |
Restricted cash and cash equivalents | 0 | 0 |
Long-term restricted cash and cash equivalents | 0 | 0 |
Significant other observable inputs (level 2) | Bank-time deposits | | |
Assets measured at fair value on a recurring basis | | |
Cash and cash equivalents | 0 | 0 |
Restricted cash and cash equivalents | 0 | |
Short-term investments | 0 | 0 |
Significant other observable inputs (level 2) | Commercial paper | | |
Assets measured at fair value on a recurring basis | | |
Cash and cash equivalents | 94,105 | 97,544 |
Short-term investments | 97,910 | 87,553 |
Significant other observable inputs (level 2) | Corporate bonds | | |
Assets measured at fair value on a recurring basis | | |
Cash and cash equivalents | 37,261 | 9,888 |
Short-term investments | 401,198 | 334,631 |
Significant other observable inputs (level 2) | US Treasuries | | |
Assets measured at fair value on a recurring basis | | |
Short-term investments | 0 | 0 |
Significant other observable inputs (level 2) | Asset-backed securities | | |
Assets measured at fair value on a recurring basis | | |
Short-term investments | 1,007 | |
Significant other observable inputs (level 2) | Cross-currency swap | | |
Assets measured at fair value on a recurring basis | | |
Prepaid expenses and other | | 11,275 |
Significant other observable inputs (level 2) | Private equity | | |
Assets measured at fair value on a recurring basis | | |
Private equity | 0 | 0 |
Significant other observable inputs (level 2) | Foreign currency forward contracts | | |
Assets measured at fair value on a recurring basis | | |
Foreign currency forward contracts | (242) | (11) |
Significant unobservable inputs (level 3) | | |
Assets measured at fair value on a recurring basis | | |
Total recurring fair value measurements, net | 5,364 | 2,759 |
Significant unobservable inputs (level 3) | Money market funds | | |
Assets measured at fair value on a recurring basis | | |
Cash and cash equivalents | 0 | 0 |
Restricted cash and cash equivalents | 0 | 0 |
Long-term restricted cash and cash equivalents | 0 | 0 |
Significant unobservable inputs (level 3) | Bank-time deposits | | |
Assets measured at fair value on a recurring basis | | |
Cash and cash equivalents | 0 | 0 |
Restricted cash and cash equivalents | 0 | |
Short-term investments | 0 | 0 |
Significant unobservable inputs (level 3) | Commercial paper | | |
Assets measured at fair value on a recurring basis | | |
Cash and cash equivalents | 0 | 0 |
Short-term investments | 0 | 0 |
Significant unobservable inputs (level 3) | Corporate bonds | | |
Assets measured at fair value on a recurring basis | | |
Cash and cash equivalents | 0 | 0 |
Short-term investments | 0 | 0 |
Significant unobservable inputs (level 3) | US Treasuries | | |
Assets measured at fair value on a recurring basis | | |
Short-term investments | 0 | 0 |
Significant unobservable inputs (level 3) | Asset-backed securities | | |
Assets measured at fair value on a recurring basis | | |
Short-term investments | 0 | |
Significant unobservable inputs (level 3) | Cross-currency swap | | |
Assets measured at fair value on a recurring basis | | |
Prepaid expenses and other | | 0 |
Significant unobservable inputs (level 3) | Private equity | | |
Assets measured at fair value on a recurring basis | | |
Private equity | 5,364 | 2,759 |
Significant unobservable inputs (level 3) | Foreign currency forward contracts | | |
Assets measured at fair value on a recurring basis | | |
Foreign currency forward contracts | $ 0 | $ 0 |