ACCUMULATED OTHER COMPREHENSIVE LOSS (Details) - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Changes in accumulated other comprehensive loss
Beginning balance	$ 3,331,892	$ 2,539,244
Other comprehensive income (loss) before reclassifications	5,894	7,578
Amounts reclassified from accumulated other comprehensive loss	0	(1,333)
Ending balance	3,631,307	2,651,028
Foreign currency translation adjustments
Changes in accumulated other comprehensive loss
Beginning balance	(9,282)	(60,535)
Other comprehensive income (loss) before reclassifications	6,132	4,701
Amounts reclassified from accumulated other comprehensive loss	0	0
Ending balance	(3,150)	(55,834)
Unrealized gain (loss) on forward contracts
Changes in accumulated other comprehensive loss
Beginning balance		600
Other comprehensive income (loss) before reclassifications		0
Amounts reclassified from accumulated other comprehensive loss		0
Ending balance		600
Unrealized gain (loss) on cross-currency swap
Changes in accumulated other comprehensive loss
Beginning balance		4,305
Other comprehensive income (loss) before reclassifications		(2,972)
Amounts reclassified from accumulated other comprehensive loss		(1,333)
Ending balance		0
Unrealized gain (loss) on available-for- sales securities
Changes in accumulated other comprehensive loss
Beginning balance	618	(2,746)
Other comprehensive income (loss) before reclassifications	(238)	5,849
Amounts reclassified from accumulated other comprehensive loss	0	0
Ending balance	380	3,103
Total
Changes in accumulated other comprehensive loss
Beginning balance	(8,664)	(58,376)
Ending balance	$ (2,770)	$ (52,131)