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Reclassification Out of Accumulated Other Comprehensive Income (OCI) by Income line Item and the Related Tax Effect (Detail) ₨ in Millions, $ in Millions | 12 Months Ended
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Mar. 31, 2021 INR (₨) | Mar. 31, 2021 USD ($) | Mar. 31, 2020 INR (₨) | Mar. 31, 2019 INR (₨) | [1]
Available for sale debt securities: |  |  |  |  |
Allowance on available for sale debt securities | ₨ (2,915.1) | $ (39.9) | ₨ (9,109.0) | [1] | ₨ (1,081.0)
Net of income tax | (23,271.9) |  | (8,823.1) |  |
Available for Sale Securities |  |  |  |  |
Available for sale debt securities: |  |  |  |  |
Net of income tax | (23,271.9) |  | (8,823.1) |  |
Reclassification out of Accumulated Other Comprehensive Income | Available for Sale Securities |  |  |  |  |
Available for sale debt securities: |  |  |  |  |
Realized (gain)/loss on sales of available for sale debt securities, net | (34,014.8) | (465.1) | (22,671.3) |  |
Allowance on available for sale debt securities | 2,915.1 | 39.9 | 9,109.0 |  |
Total before income tax | (31,099.7) | (425.2) | (13,562.3) |  |
Income tax | 7,827.8 | 107.0 | 4,739.2 |  |
Net of income tax | ₨ (23,271.9) | $ (318.2) | ₨ (8,823.1) |  |
[1] | For fiscal 2019 and 2020 the amount represents Other than temporary impairment. The Bank adopted the CECL accounting guidance on April 1, 2020.

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- Definition Amount before tax of reclassification adjustments of other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 45 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=118261656&loc=d3e32136-110900 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=121641772&loc=SL7669686-108580 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450520&loc=d3e32583-110901 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 17B -URI http://asc.fasb.org/extlink&oid=121641772&loc=SL34724394-108580 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 45 -Paragraph 20 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=118261656&loc=d3e32211-110900 + Details
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