EARNINGS PER SHARE AND ACCUMULATED OTHER COMPREHENSIVE INCOME - Accumulated Other Comprehensive Income (Details) $ in Thousands	9 Months Ended
	Dec. 31, 2017 USD ($)
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Balance as of March 31, 2017	$ 1,294,232
Net current period other comprehensive income	20,924
Balance as of December 31, 2017	1,253,965
Currency Translation Adjustments
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Balance as of March 31, 2017	(149,721)
Other comprehensive income before reclassification	20,924
Reclassified from accumulated other comprehensive income	0
Net current period other comprehensive income	20,924
Foreign exchange rate impact	18,885
Balance as of December 31, 2017	(109,912)
Pension Liability Adjustments
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Balance as of March 31, 2017	(178,556)
Other comprehensive income before reclassification	0
Reclassified from accumulated other comprehensive income	0
Net current period other comprehensive income	0
Foreign exchange rate impact	(18,885)
Balance as of December 31, 2017	(197,441)
Total
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Balance as of March 31, 2017	(328,277)
Other comprehensive income before reclassification	20,924
Reclassified from accumulated other comprehensive income	0
Net current period other comprehensive income	20,924
Foreign exchange rate impact	0
Balance as of December 31, 2017	$ (307,353)