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Financial instruments (Details 5) - Currency swap contract [member] ₨ in Thousands, $ in Thousands | Mar. 31, 2022 INR (₨) | Mar. 31, 2022 USD ($) | Mar. 31, 2021 INR (₨) | Mar. 31, 2021 USD ($)
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Maturity Analysis For Derivative Financial Instruments [Line Items] |  |  |  |
Payable | $ |  | $ 45,000 |  | $ 50,000
Receivable | ₨ | ₨ 330,750 |  | ₨ 367,500 |
Less than 1 year [Member] |  |  |  |
Maturity Analysis For Derivative Financial Instruments [Line Items] |  |  |  |
Payable | $ |  | 10,000 |  | 5,000
Receivable | ₨ | 73,500 |  | 36,750 |
One to two years [Member] |  |  |  |
Maturity Analysis For Derivative Financial Instruments [Line Items] |  |  |  |
Payable | $ |  | 10,000 |  | 10,000
Receivable | ₨ | 73,500 |  | 73,500 |
Two to three years [Member] |  |  |  |
Maturity Analysis For Derivative Financial Instruments [Line Items] |  |  |  |
Payable | $ |  | 10,000 |  | 10,000
Receivable | ₨ | 73,500 |  | 73,500 |
Three to four years [Member] |  |  |  |
Maturity Analysis For Derivative Financial Instruments [Line Items] |  |  |  |
Payable | $ |  | 10,000 |  | 10,000
Receivable | ₨ | 73,500 |  | 73,500 |
Four to five years [member] |  |  |  |
Maturity Analysis For Derivative Financial Instruments [Line Items] |  |  |  |
Payable | $ |  | 5,000 |  | 10,000
Receivable | ₨ | 36,800 |  | 73,500 |
More than five years |  |  |  |
Maturity Analysis For Derivative Financial Instruments [Line Items] |  |  |  |
Payable | $ |  | $ 0 |  | $ 5,000
Receivable | ₨ | ₨ 0 |  | ₨ 36,750 |

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