FINANCING ARRANGEMENTS - Schedule of Long-term Debt (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2017
Debt Instrument [Line Items]
Long-term debt	$ 90,000		$ 120,599
Line of Credit | Revolving Credit Facility, March 2018 | Revolving Credit Facility
Debt Instrument [Line Items]
Interest rate %	3.34%		0.00%
Long-term debt	$ 90,000		$ 0
Line of Credit | Revolving Credit Facility, June 2011 | Revolving Credit Facility
Debt Instrument [Line Items]
Interest rate %	0.00%		0.00%
Long-term debt	$ 0		$ 0
Senior Notes | Senior term notes
Debt Instrument [Line Items]
Interest rate %	5.50%	5.50%	5.50%
Long-term debt	$ 0		$ 120,599