Derivative Instruments and Hedge Accounting - Additional Information (Details) - Interest Rate Swap - USD ($) $ in Millions	12 Months Ended
Mar. 31, 2019	Mar. 31, 2018
Derivative [Line Items]
Notional amount	$ 11.5	$ 12.0
Maximum remaining length of interest rate swap contract	10 years 3 months 18 days

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 13
-Sentence Column B

Name:	invest_DerivativeNotionalAmount
Namespace Prefix:	invest_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	instant