ACCUMULATED OTHER COMPREHENSIVE LOSS (Details) - USD ($) $ in Thousands	9 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Changes in accumulated other comprehensive loss
Beginning balance	$ 2,040,580	$ 1,488,970
Ending balance	2,402,035	2,027,467
Foreign currency translation adjustments
Changes in accumulated other comprehensive loss
Beginning balance	(33,090)	(4,287)
Other comprehensive income (loss) before reclassifications	(3,192)	(40,666)
Amounts reclassified from accumulated other comprehensive loss	0	0
Ending balance	(36,282)	(44,953)
Unrealized gain (loss) on forward contracts
Changes in accumulated other comprehensive loss
Beginning balance	600	600
Other comprehensive income (loss) before reclassifications	0	0
Amounts reclassified from accumulated other comprehensive loss	0	0
Ending balance	600	600
Unrealized gain (loss) on cross-currency swap
Changes in accumulated other comprehensive loss
Beginning balance	(5,285)	(10,191)
Other comprehensive income (loss) before reclassifications	2,598	1,158
Amounts reclassified from accumulated other comprehensive loss	(1,157)	3,228
Ending balance	(3,844)	(5,805)
Unrealized gain (loss) on available-for- sales securities
Changes in accumulated other comprehensive loss
Beginning balance	586	(1,854)
Other comprehensive income (loss) before reclassifications	453	1,058
Amounts reclassified from accumulated other comprehensive loss	0	0
Ending balance	1,039	(796)
Accumulated Other Comprehensive Income (Loss)
Changes in accumulated other comprehensive loss
Beginning balance	(37,189)	(15,732)
Other comprehensive income (loss) before reclassifications	(141)	(38,450)
Amounts reclassified from accumulated other comprehensive loss	(1,157)	3,228
Ending balance	$ (38,487)	$ (50,954)