EARNINGS PER SHARE AND ACCUMULATED OTHER COMPREHENSIVE INCOME - Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Accumulated other comprehensive loss - beginning balance	$ (327,989)
Net current period other comprehensive income	17,362	$ (27,824)
Accumulated other comprehensive loss - ending balance	(310,627)
Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Accumulated other comprehensive loss - beginning balance	(327,989)
Other comprehensive income before reclassification	17,373
Reclassified from accumulated other comprehensive income	(11)
Net current period other comprehensive income	17,362
Foreign exchange rate impact	0
Accumulated other comprehensive loss - ending balance	(310,627)
Currency Translation Adjustments | Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Accumulated other comprehensive loss - beginning balance	(137,867)
Other comprehensive income before reclassification	16,888
Reclassified from accumulated other comprehensive income	0
Net current period other comprehensive income	16,888
Foreign exchange rate impact	(5,280)
Accumulated other comprehensive loss - ending balance	(126,259)
Pension Liability Adjustments | Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Accumulated other comprehensive loss - beginning balance	(189,734)
Other comprehensive income before reclassification	0
Reclassified from accumulated other comprehensive income	0
Net current period other comprehensive income	0
Foreign exchange rate impact	5,280
Accumulated other comprehensive loss - ending balance	(184,454)
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Accumulated other comprehensive loss - beginning balance	(388)
Other comprehensive income before reclassification	485
Reclassified from accumulated other comprehensive income	(11)
Net current period other comprehensive income	474
Foreign exchange rate impact	0
Accumulated other comprehensive loss - ending balance	$ 86