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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, 2024 CAD ($) | Sep. 30, 2024 USD ($) | Sep. 30, 2024 EUR (€) | Sep. 30, 2024 GBP (£) | Sep. 30, 2024 SEK (kr) | Sep. 30, 2023 CAD ($)
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USD/INR |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Notional amount of financial liabilities |  | $ 359,901 |  |  |  |
USD/INR | Less than one year |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Average rate of hedging instrument | 85.23% | 85.23% | 85.23% | 85.23% | 85.23% |
USD/INR | More than one year |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Average rate of hedging instrument | 88.92% | 88.92% | 88.92% | 88.92% | 88.92% |
CAD/INR |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Notional amount of financial liabilities | $ 381,045 |  |  |  |  |
CAD/INR | Less than one year |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Average rate of hedging instrument | 64.11% | 64.11% | 64.11% | 64.11% | 64.11% |
CAD/INR | More than one year |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Average rate of hedging instrument | 65.75% | 65.75% | 65.75% | 65.75% | 65.75% |
EUR/INR |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Notional amount of financial liabilities | € |  |  | € 112,863 |  |  |
EUR/INR | Less than one year |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Average rate of hedging instrument | 94.45% | 94.45% | 94.45% | 94.45% | 94.45% |
EUR/INR | More than one year |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Average rate of hedging instrument | 99.84% | 99.84% | 99.84% | 99.84% | 99.84% |
GBP/INR |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Notional amount of financial liabilities | £ |  |  |  | £ 107,169 |  |
GBP/INR | Less than one year |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Average rate of hedging instrument | 106.93% | 106.93% | 106.93% | 106.93% | 106.93% |
GBP/INR | More than one year |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Average rate of hedging instrument | 112.11% | 112.11% | 112.11% | 112.11% | 112.11% |
SEK/INR |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Notional amount of financial liabilities | kr |  |  |  |  | kr 157,427 |
SEK/INR | Less than one year |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Average rate of hedging instrument | 8.18% | 8.18% | 8.18% | 8.18% | 8.18% |
SEK/INR | More than one year |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Average rate of hedging instrument | 8.67% | 8.67% | 8.67% | 8.67% | 8.67% |
GBP/EUR |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Notional amount of financial liabilities | £ |  |  |  | £ 202,819 |  |
GBP/EUR | Less than one year |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Average rate of hedging instrument | 1.18% | 1.18% | 1.18% | 1.18% | 1.18% |
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 | € |  |  | € 22,947 |  |  |
EUR/MAD | Less than one year |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Average rate of hedging instrument | 10.66% | 10.66% | 10.66% | 10.66% | 10.66% |
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 | € |  |  | € 16,771 |  |  |
EUR/CZK | Less than one year |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Average rate of hedging instrument | 24.64% | 24.64% | 24.64% | 24.64% | 24.64% |
EUR/CZK | More than one year |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Average rate of hedging instrument | 25.05% | 25.05% | 25.05% | 25.05% | 25.05% |
Others |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Notional amount of financial liabilities | $ 65,784 |  |  |  |  |
At fair value |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Hedging instrument, assets |  |  |  |  |  | $ 14,350
Hedged item, liabilities | (15,578) |  |  |  |  |
At fair value | USD/INR |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Hedging instrument, assets | 2,091 |  |  |  |  |
Hedged item, liabilities |  |  |  |  |  | (973)
At fair value | CAD/INR |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Hedging instrument, assets | 314 |  |  |  |  | 4,497
At fair value | EUR/INR |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Hedging instrument, assets |  |  |  |  |  | 5,076
Hedged item, liabilities | (1,156) |  |  |  |  |
At fair value | GBP/INR |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Hedging instrument, assets |  |  |  |  |  | 3,501
Hedged item, liabilities | (8,700) |  |  |  |  |
At fair value | SEK/INR |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Hedged item, liabilities | (720) |  |  |  |  | (33)
At fair value | GBP/EUR |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Hedging instrument, assets |  |  |  |  |  | 649
Hedged item, liabilities | (5,763) |  |  |  |  |
At fair value | EUR/MAD |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Hedging instrument, assets |  |  |  |  |  | 135
Hedged item, liabilities | (548) |  |  |  |  |
At fair value | EUR/CZK |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Hedged item, liabilities | (473) |  |  |  |  | (92)
At fair value | Others |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Hedging instrument, assets |  |  |  |  |  | $ 1,590
Hedged item, liabilities | $ (623) |  |  |  |  |

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