ACCUMULATED OTHER COMPREHENSIVE LOSS (Details) - USD ($) $ in Thousands	6 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Changes in accumulated other comprehensive loss
Beginning balance	$ 3,331,892	$ 2,539,244
Other comprehensive income (loss) before reclassifications	(11,083)	24,885
Amounts reclassified from accumulated other comprehensive loss		(1,333)
Ending balance	3,469,668	2,901,282
Foreign currency translation adjustments
Changes in accumulated other comprehensive loss
Beginning balance	(9,282)	(60,535)
Other comprehensive income (loss) before reclassifications	(10,599)	23,562
Amounts reclassified from accumulated other comprehensive loss		0
Ending balance	(19,881)	(36,973)
Unrealized gain (loss) on derivative instruments
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	(484)	4,295
Amounts reclassified from accumulated other comprehensive loss		0
Ending balance	134	1,549
Total
Changes in accumulated other comprehensive loss
Beginning balance	(8,664)	(58,376)
Ending balance	$ (19,747)	$ (34,824)