Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

No definition available.

Name:	us-gaap_DerivativeLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

DERIVATIVE FINANCIAL INSTRUMENTS - Additional Information (Details)	Mar. 31, 2018 portfolio_maintenance_agreement support_agreement	Jan. 31, 2016 portfolio_maintenance_agreement	Oct. 31, 2012 portfolio_maintenance_agreement
Derivative [Line Items]
Number of premium support agreements \| support_agreement	2
PLC
Derivative [Line Items]
Number of portfolio maintenance agreements \| portfolio_maintenance_agreement	3	1	2