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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, 2022 CAD ($) | Sep. 30, 2022 USD ($) | Sep. 30, 2022 EUR (€) | Sep. 30, 2022 GBP (£) | Sep. 30, 2022 SEK (kr) | Sep. 30, 2021 CAD ($)
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USD/INR |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Notional amount |  | $ 227,289 |  |  |  |
USD/INR | Less than one year |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Average rate of hedging instrument | 80.99% | 80.99% | 80.99% | 80.99% | 80.99% |
USD/INR | More than one year |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Average rate of hedging instrument | 83.17% | 83.17% | 83.17% | 83.17% | 83.17% |
CAD/INR |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Notional amount | $ 302,557 |  |  |  |  |
CAD/INR | Less than one year |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Average rate of hedging instrument | 62.40% | 62.40% | 62.40% | 62.40% | 62.40% |
CAD/INR | More than one year |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Average rate of hedging instrument | 64.41% | 64.41% | 64.41% | 64.41% | 64.41% |
EUR/INR |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Notional amount | € |  |  | € 67,895 |  |  |
EUR/INR | Less than one year |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Average rate of hedging instrument | 96.28% | 96.28% | 96.28% | 96.28% | 96.28% |
EUR/INR | More than one year |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Average rate of hedging instrument | 95.93% | 95.93% | 95.93% | 95.93% | 95.93% |
GBP/INR |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Notional amount | £ |  |  |  | £ 61,686 |  |
GBP/INR | Less than one year |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Average rate of hedging instrument | 106.91% | 106.91% | 106.91% | 106.91% | 106.91% |
GBP/INR | More than one year |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Average rate of hedging instrument | 105.62% | 105.62% | 105.62% | 105.62% | 105.62% |
SEK/INR |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Notional amount | kr |  |  |  |  | kr 49,908 |
SEK/INR | Less than one year |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Average rate of hedging instrument | 9.04% | 9.04% | 9.04% | 9.04% | 9.04% |
SEK/INR | More than one year |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Average rate of hedging instrument | 7.40% | 7.40% | 7.40% | 7.40% | 7.40% |
EUR/MAD |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Notional amount | € |  |  | € 22,190 |  |  |
EUR/MAD | Less than one year |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Average rate of hedging instrument | 11.00% | 11.00% | 11.00% | 11.00% | 11.00% |
EUR/MAD | More than one year |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Average rate of hedging instrument | 10.70% | 10.70% | 10.70% | 10.70% | 10.70% |
EUR/CZK |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Notional amount | € |  |  | € 7,082 |  |  |
EUR/CZK | Less than one year |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Average rate of hedging instrument | 26.80% | 26.80% | 26.80% | 26.80% | 26.80% |
EUR/CZK | More than one year |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Average rate of hedging instrument | 26.87% | 26.87% | 26.87% | 26.87% | 26.87% |
EUR/SEK |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Notional amount | € |  |  | € 7,241 |  |  |
EUR/SEK | Less than one year |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Average rate of hedging instrument | 10.77% | 10.77% | 10.77% | 10.77% | 10.77% |
EUR/SEK | More than one year |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Average rate of hedging instrument | 10.36% | 10.36% | 10.36% | 10.36% | 10.36% |
Others |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Notional amount | $ 65,935 |  |  |  |  |
At fair value |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Hedging instrument, assets | 24,060 |  |  |  |  | $ 19,375
At fair value | USD/INR |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Hedging instrument, assets |  |  |  |  |  | 4,002
Hedged item, liabilities | (7,803) |  |  |  |  |
At fair value | CAD/INR |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Hedging instrument, assets | 7,865 |  |  |  |  | 882
At fair value | EUR/INR |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Hedging instrument, assets | 11,690 |  |  |  |  | 6,650
At fair value | GBP/INR |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Hedging instrument, assets | 12,753 |  |  |  |  | 2,390
At fair value | SEK/INR |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Hedging instrument, assets | 1,047 |  |  |  |  |
Hedged item, liabilities |  |  |  |  |  | (10)
At fair value | EUR/GBP |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Hedging instrument, assets | 0 |  |  |  |  | 1,033
At fair value | EUR/MAD |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Hedging instrument, assets |  |  |  |  |  | 2,064
Hedged item, liabilities | (201) |  |  |  |  |
At fair value | EUR/CZK |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Hedging instrument, assets | 611 |  |  |  |  | 758
At fair value | EUR/SEK |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Hedging instrument, assets |  |  |  |  |  | 1,396
Hedged item, liabilities | (148) |  |  |  |  |
At fair value | Others |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Hedging instrument, assets |  |  |  |  |  | $ 210
Hedged item, liabilities | $ (1,754) |  |  |  |  |

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