XML 166 R155.htm IDEA: XBRL DOCUMENT
v3.7.0.1

Movement in Provision for Credit Card and Debit Card Reward Points (Detail) - Debit and Credit Cards Reward Points ₨ in Millions, $ in Millions | 12 Months Ended
--- | ---
Mar. 31, 2017 INR (₨) | Mar. 31, 2017 USD ($) | Mar. 31, 2016 INR (₨)
Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Opening provision of reward points | ₨ 3,063.6 | $ 47.2 | ₨ 2,000.7
Provision made during the year | 2,786.8 | 43.0 | 1,482.7
Utilization/write back of provision | (2,093.6) | (32.3) | (732.1)
Closing provision of reward points | 4,312.4 | 66.5 | 3,063.6
Change in Rate of Accrual of Reward Points |  |  |
Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Effect of change in rate of accrual of points/cost of reward | 242.8 | 3.7 | 202.0
Change in Cost of Reward Points |  |  |
Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Effect of change in rate of accrual of points/cost of reward | ₨ 312.8 | $ 4.9 | ₨ 110.3

X
- Definition Utilization and write back in the liability during the period on provision towards cost of products or services under reward points to credit card and debit card customers resulting from customer loyalty program. + References No definition available. + Details
Name: | hdb_ProvisionForRewardPointsUtilizationAndWriteBack
Namespace Prefix: | hdb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of increase (decrease) in the allowances and reserves, which consist of the valuation and qualifying accounts that are either netted against the cost of an asset or that reflect a liability established to represent expected future costs, from adjustments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 + Details
Name: | us-gaap_ValuationAllowancesAndReservesAdjustments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Total of allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 + Details
Name: | us-gaap_ValuationAllowancesAndReservesBalance
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of increase in the allowances and reserves, which consist of the valuation and qualifying accounts that are either netted against the cost of an asset or that reflect a liability established to represent expected future costs, from charges to costs and expenses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 + Details
Name: | us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition 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. + References No definition available. + Details
Name: | us-gaap_ValuationAndQualifyingAccountsDisclosureLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_ValuationAllowancesAndReservesTypeAxis=hdb_DebitAndCreditCardsRewardPointsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | hdb_ValuationAllowanceChangeAxis=hdb_ChangeInRateOfAccrualOfRewardPointsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | hdb_ValuationAllowanceChangeAxis=hdb_ChangeInCostOfRewardPointsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |