Concentrations of Credit Risk (Details)	9 Months Ended
Dec. 31, 2018 item
Credit Concentration Risk [Member]
Concentration Risk [Line Items]
Number of carriers	1

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