FAIR VALUE MEASUREMENTS - Recurring Fair Value Measurements (Details) - USD ($) $ in Thousands | Jun. 30, 2021 | Mar. 31, 2021 |
Assets measured at fair value on a recurring basis | | |
Short-term investments | $ 1,135,188 | $ 1,308,692 |
Total recurring fair value measurements, net | 2,852,030 | 2,976,627 |
Money market funds | | |
Assets measured at fair value on a recurring basis | | |
Cash and cash equivalents | 633,114 | 837,614 |
Restricted cash and cash equivalents | 642,912 | 528,659 |
Long-term restricted cash and cash equivalents | 103,433 | 98,541 |
Bank-time deposits | | |
Assets measured at fair value on a recurring basis | | |
Cash and cash equivalents | 382,000 | 95,000 |
Restricted cash and cash equivalents | 557 | 563 |
Short-term investments | 266,869 | 578,762 |
Commercial paper | | |
Assets measured at fair value on a recurring basis | | |
Cash and cash equivalents | 17,980 | 100,105 |
Short-term investments | 150,811 | 148,150 |
US Agencies | | |
Assets measured at fair value on a recurring basis | | |
Cash and cash equivalents | 5,000 | |
Corporate bonds | | |
Assets measured at fair value on a recurring basis | | |
Cash and cash equivalents | 1,001 | 0 |
Short-term investments | 661,790 | 521,224 |
US Treasuries | | |
Assets measured at fair value on a recurring basis | | |
Short-term investments | 55,489 | 60,086 |
Asset-backed securities | | |
Assets measured at fair value on a recurring basis | | |
Short-term investments | 229 | 470 |
Private equity | | |
Assets measured at fair value on a recurring basis | | |
Private equity | 9,670 | 7,578 |
Foreign currency forward contracts | | |
Assets measured at fair value on a recurring basis | | |
Foreign currency forward contracts | (161) | (125) |
Contingent consideration, current | (28,294) | |
Contingent consideration, noncurrent | (50,370) | |
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 | 2,084,374 | 2,199,225 |
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 | 633,114 | 837,614 |
Restricted cash and cash equivalents | 642,912 | 528,659 |
Long-term restricted cash and cash equivalents | 103,433 | 98,541 |
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 | 382,000 | 95,000 |
Restricted cash and cash equivalents | 557 | 563 |
Short-term investments | 266,869 | 578,762 |
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) | US Agencies | | |
Assets measured at fair value on a recurring basis | | |
Cash and cash equivalents | 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 | 55,489 | 60,086 |
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 | 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 |
Contingent consideration, current | 0 | |
Contingent consideration, noncurrent | 0 | |
Significant other observable inputs (level 2) | | |
Assets measured at fair value on a recurring basis | | |
Total recurring fair value measurements, net | 836,650 | 769,824 |
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 | 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 | 17,980 | 100,105 |
Short-term investments | 150,811 | 148,150 |
Significant other observable inputs (level 2) | US Agencies | | |
Assets measured at fair value on a recurring basis | | |
Cash and cash equivalents | 5,000 | |
Significant other observable inputs (level 2) | Corporate bonds | | |
Assets measured at fair value on a recurring basis | | |
Cash and cash equivalents | 1,001 | 0 |
Short-term investments | 661,790 | 521,224 |
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 | 229 | 470 |
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 | (161) | (125) |
Contingent consideration, current | 0 | |
Contingent consideration, noncurrent | 0 | |
Significant unobservable inputs (level 3) | | |
Assets measured at fair value on a recurring basis | | |
Total recurring fair value measurements, net | (68,994) | 7,578 |
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 | 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) | US Agencies | | |
Assets measured at fair value on a recurring basis | | |
Cash and cash equivalents | 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 | 0 |
Significant unobservable inputs (level 3) | Private equity | | |
Assets measured at fair value on a recurring basis | | |
Private equity | 9,670 | 7,578 |
Significant unobservable inputs (level 3) | Foreign currency forward contracts | | |
Assets measured at fair value on a recurring basis | | |
Foreign currency forward contracts | 0 | $ 0 |
Contingent consideration, current | (28,294) | |
Contingent consideration, noncurrent | $ (50,370) | |