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Financial instruments - Notional, average contract rates and maturities (Details) € in Thousands, £ in Thousands, kr in Thousands, $ in Thousands, $ in Thousands | Sep. 30, 2023 CAD ($) | Sep. 30, 2023 USD ($) | Sep. 30, 2023 EUR (€) | Sep. 30, 2023 GBP (£) | Sep. 30, 2023 SEK (kr) | Sep. 30, 2022 CAD ($)
--- | --- | --- | --- | --- | --- | ---
USD/INR |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Notional amount of financial liabilities |  | $ 278,814 |  |  |  |
USD/INR | Less than one year |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Average rate of hedging instrument | 83.27% | 83.27% | 83.27% | 83.27% | 83.27% |
USD/INR | More than one year |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Average rate of hedging instrument | 87.32% | 87.32% | 87.32% | 87.32% | 87.32% |
CAD/INR |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Notional amount of financial liabilities | $ 292,047 |  |  |  |  |
CAD/INR | Less than one year |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Average rate of hedging instrument | 63.77% | 63.77% | 63.77% | 63.77% | 63.77% |
CAD/INR | More than one year |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Average rate of hedging instrument | 65.32% | 65.32% | 65.32% | 65.32% | 65.32% |
EUR/INR |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Notional amount of financial liabilities | € |  |  | € 78,476 |  |  |
EUR/INR | Less than one year |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Average rate of hedging instrument | 95.01% | 95.01% | 95.01% | 95.01% | 95.01% |
EUR/INR | More than one year |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Average rate of hedging instrument | 96.54% | 96.54% | 96.54% | 96.54% | 96.54% |
GBP/INR |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Notional amount of financial liabilities | £ |  |  |  | £ 67,507 |  |
GBP/INR | Less than one year |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Average rate of hedging instrument | 107.07% | 107.07% | 107.07% | 107.07% | 107.07% |
GBP/INR | More than one year |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Average rate of hedging instrument | 106.76% | 106.76% | 106.76% | 106.76% | 106.76% |
SEK/INR |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Notional amount of financial liabilities | kr |  |  |  |  | kr 15,000 |
SEK/INR | Less than one year |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Average rate of hedging instrument | 7.48% | 7.48% | 7.48% | 7.48% | 7.48% |
SEK/INR | More than one year |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Average rate of hedging instrument | 0.00% | 0.00% | 0.00% | 0.00% | 0.00% |
GBP/EUR |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Notional amount of financial liabilities | £ |  |  |  | £ 77,610 |  |
GBP/EUR | Less than one year |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Average rate of hedging instrument | 1.16% | 1.16% | 1.16% | 1.16% | 1.16% |
GBP/EUR | More than one year |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Average rate of hedging instrument | 0.00% | 0.00% | 0.00% | 0.00% | 0.00% |
EUR/MAD |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Notional amount of financial liabilities | € |  |  | € 24,466 |  |  |
EUR/MAD | Less than one year |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Average rate of hedging instrument | 10.94% | 10.94% | 10.94% | 10.94% | 10.94% |
EUR/MAD | More than one year |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Average rate of hedging instrument | 0.00% | 0.00% | 0.00% | 0.00% | 0.00% |
EUR/CZK |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Notional amount of financial liabilities | € |  |  | € 15,062 |  |  |
EUR/CZK | Less than one year |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Average rate of hedging instrument | 24.80% | 24.80% | 24.80% | 24.80% | 24.80% |
EUR/CZK | More than one year |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Average rate of hedging instrument | 24.55% | 24.55% | 24.55% | 24.55% | 24.55% |
Others |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Notional amount of financial liabilities | $ 78,027 |  |  |  |  |
At fair value |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Hedging instrument, assets | 14,350 |  |  |  |  | $ 24,060
At fair value | USD/INR |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Hedged item, liabilities | (973) |  |  |  |  | (7,803)
At fair value | CAD/INR |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Hedging instrument, assets | 4,497 |  |  |  |  | 7,865
At fair value | EUR/INR |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Hedging instrument, assets | 5,076 |  |  |  |  | 11,690
At fair value | GBP/INR |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Hedging instrument, assets | 3,501 |  |  |  |  | 12,753
At fair value | SEK/INR |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Hedging instrument, assets |  |  |  |  |  | 1,047
Hedged item, liabilities | (33) |  |  |  |  |
At fair value | GBP/EUR |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Hedging instrument, assets | 649 |  |  |  |  | 0
At fair value | EUR/MAD |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Hedging instrument, assets | 135 |  |  |  |  |
Hedged item, liabilities |  |  |  |  |  | (201)
At fair value | EUR/CZK |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Hedging instrument, assets |  |  |  |  |  | 611
Hedged item, liabilities | (92) |  |  |  |  |
At fair value | Others |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Hedging instrument, assets | $ 1,590 |  |  |  |  |
Hedged item, liabilities |  |  |  |  |  | $ (1,902)

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