LONG-TERM DEBT - Interest rate (Details)	Mar. 31, 2018	Mar. 31, 2017
LONG-TERM DEBT
Weighted average interest rate for the credit facilities (as percent)	1.47%	1.32%

Weighted average interest rate of long-term debt outstanding calculated at point in time.

No definition available.

Name:	us-gaap_LongtermDebtWeightedAverageInterestRate
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant