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Accumulated other comprehensive income | 12 Months Ended
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Mar. 31, 2019
Accumulated other comprehensive income | 19. Accumulated other comprehensive income The below table presents the changes in accumulated other comprehensive income (OCI) after income tax for the years ended March 31, 2018 and March 31, 2019.
|  | Available for sale securities |  |  | Foreign currency translation reserve |  |  | Total |
|  | (In millions) |
Balance, March 31, 2017 |  | Rs. | 25,433.1 |  |  | Rs. | 598.5 |  |  | Rs. | 26,031.6 |
Net unrealized gain/(loss) arising during the period |  |  | (21,445.3 | ) |  |  | 72.1 |  |  |  | (21,373.2 | )
Amounts reclassified to income |  |  | (8,455.1 | ) |  |  | 0.0 |  |  |  | (8,455.1 | )
Balance, March 31, 2018 |  | Rs. | (4,467.3 | ) |  | Rs. | 670.6 |  |  | Rs. | (3,796.7 | )
Balance, March 31, 2018 |  | Rs. | (4,467.3 | ) |  | Rs. | 670.6 |  |  | Rs. | (3,796.7 | )
Adjustment to Other Comprehensive Income (loss) |  |  | (268.0 | ) |  |  | 0.0 |  |  |  | (268.0 | )
Net unrealized gain/(loss) arising during the period |  |  | 17,105.1 |  |  |  | 663.9 |  |  |  | 17,769.0 |
Amounts reclassified to income |  |  | (1,895.5 | ) |  |  | 0.0 |  |  |  | (1,895.5 | )
Balance, March 31, 2019 |  | Rs. | 10,474.3 |  |  | Rs. | 1,334.5 |  |  | Rs. | 11,808.8 |
Balance, March 31, 2019 |  | US$ | 151.5 |  |  | US$ | 19.2 |  |  | US$ | 170.7 |
The below table presents the reclassification out of accumulated other comprehensive income (OCI) by income line item and the related income tax effect for periods ended March 31, 2018 and March 31, 2019.
|  | As of March 31, |
|  | 2018 |  |  | 2019 |  |  | 2019 |
|  | (In millions) |
Available for sale debt securities: |  |  |  |  |  |  |  |  |  |  |  |
Realized (gain)/loss on sales of available for sale debt securities, net |  | Rs. | (13,145.7) |  |  | Rs. | (3,994.6) |  |  | US$ | (57.8) |
Other than temporary impairment losses on available for sale debt securities |  |  | 149.1 |  |  |  | 1,081.0 |  |  |  | 15.6 |
Total before income tax |  | Rs. | (12,996.6) |  |  | Rs. | (2,913.6) |  |  | US$ | (42.2) |
Income tax |  |  | 4,541.5 |  |  |  | 1,018.1 |  |  |  | 14.7 |
Net of income tax |  | Rs. | (8,455.1) |  |  | Rs. | (1,895.5) |  |  | US$ | (27.5 | )

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- Definition The entire disclosure for comprehensive income, which includes, but is not limited to, 1) the amount of income tax expense or benefit allocated to each component of other comprehensive income, including reclassification adjustments, 2) the reclassification adjustments for each classification of other comprehensive income and 3) the ending accumulated balances for each component of comprehensive income. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -URI http://asc.fasb.org/topic&trid=2134417 + Details
Name: | us-gaap_ComprehensiveIncomeNoteTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration