Other Assets - Schedule of Other Assets (Parenthetical) (Detail)	12 Months Ended
Mar. 31, 2017
Deferred Costs Capitalized Prepaid And Other Assets Disclosure [Abstract]
Lease agreements for an additional period	49 years
Lease agreements total period	98 years

Term of the lessee's leasing arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

No definition available.

Name:	us-gaap_LesseeLeasingArrangementsOperatingLeasesTermOfContract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration