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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
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Mar. 31, 2016 INR (₨) | Mar. 31, 2016 USD ($) | Mar. 31, 2015 INR (₨)
Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Opening provision of reward points | ₨ 2,000.7 | $ 30.2 | ₨ 1,509.1
Provision made during the year | 1,482.7 | 22.4 | 1,066.8
Utilization/write back of provision | (732.1) | (11.1) | (637.6)
Closing provision of reward points | 3,063.6 | 46.2 | 2,000.7
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 | 202.0 | 3.0 | (408.3)
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 | ₨ 110.3 | $ 1.7 | ₨ 470.7

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- 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
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- 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
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- 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
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- Details
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