XML 158 R147.htm IDEA: XBRL DOCUMENT v3.19.2

Weighted-Average Asset Allocation of Said Plan Assets for Pension Benefits (Detail) - Pension	Mar. 31, 2019
Funds managed by trust
Weighted-average asset allocation	100.00%
Government Securities
Funds managed by trust
Weighted-average asset allocation	8.50%
Debenture and bonds
Funds managed by trust
Weighted-average asset allocation	91.50%
Other
Funds managed by trust
Weighted-average asset allocation	0.00%

X

- References

No definition available.

+ Details

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

X

- Definition

Percentage of actual investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (d)(i)
-URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920

+ Details

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

X

- Details

Name:	us-gaap_RetirementPlanTypeAxis=hdb_DomesticPensionPlansOfForeignEntityDefinedBenefitsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_InvestmentTypeAxis=hdb_GovernmentSecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_InvestmentTypeAxis=hdb_DebentureAndBondsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_InvestmentTypeAxis=hdb_OthersMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: