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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, 2025 CAD ($) | Sep. 30, 2025 USD ($) | Sep. 30, 2025 EUR (€) | Sep. 30, 2025 GBP (£) | Sep. 30, 2025 SEK (kr) | Sep. 30, 2024 CAD ($)
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USD/INR |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Notional amount of financial liabilities |  | $ 482,362 |  |  |  |
USD/INR | Less than one year |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Average rate of hedging instrument | 87.72% | 87.72% | 87.72% | 87.72% | 87.72% |
USD/INR | More than one year |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Average rate of hedging instrument | 92.05% | 92.05% | 92.05% | 92.05% | 92.05% |
CAD/INR |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Notional amount of financial liabilities | $ 458,999 |  |  |  |  |
CAD/INR | Less than one year |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Average rate of hedging instrument | 64.89% | 64.89% | 64.89% | 64.89% | 64.89% |
CAD/INR | More than one year |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Average rate of hedging instrument | 68.22% | 68.22% | 68.22% | 68.22% | 68.22% |
EUR/INR |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Notional amount of financial liabilities | € |  |  | € 170,890 |  |  |
EUR/INR | Less than one year |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Average rate of hedging instrument | 99.00% | 99.00% | 99.00% | 99.00% | 99.00% |
EUR/INR | More than one year |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Average rate of hedging instrument | 107.80% | 107.80% | 107.80% | 107.80% | 107.80% |
GBP/INR |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Notional amount of financial liabilities | £ |  |  |  | £ 129,282 |  |
GBP/INR | Less than one year |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Average rate of hedging instrument | 112.00% | 112.00% | 112.00% | 112.00% | 112.00% |
GBP/INR | More than one year |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Average rate of hedging instrument | 120.29% | 120.29% | 120.29% | 120.29% | 120.29% |
SEK/INR |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Notional amount of financial liabilities | kr |  |  |  |  | kr 258,452 |
SEK/INR | Less than one year |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Average rate of hedging instrument | 8.72% | 8.72% | 8.72% | 8.72% | 8.72% |
SEK/INR | More than one year |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Average rate of hedging instrument | 9.63% | 9.63% | 9.63% | 9.63% | 9.63% |
GBP/EUR |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Notional amount of financial liabilities | £ |  |  |  | £ 104,627 |  |
GBP/EUR | Less than one year |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Average rate of hedging instrument | 1.15% | 1.15% | 1.15% | 1.15% | 1.15% |
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% |
GBP/SEK |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Notional amount of financial liabilities | £ |  |  |  | £ 56,618 |  |
GBP/SEK | Less than one year |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Average rate of hedging instrument | 12.63% | 12.63% | 12.63% | 12.63% | 12.63% |
GBP/SEK | 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 | € |  |  | € 6,000 |  |  |
EUR/MAD | Less than one year |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Average rate of hedging instrument | 10.58% | 10.58% | 10.58% | 10.58% | 10.58% |
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 | € |  |  | € 25,800 |  |  |
EUR/CZK | Less than one year |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Average rate of hedging instrument | 25.04% | 25.04% | 25.04% | 25.04% | 25.04% |
EUR/CZK | More than one year |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Average rate of hedging instrument | 25.51% | 25.51% | 25.51% | 25.51% | 25.51% |
Others |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Notional amount of financial liabilities | $ 58,644 |  |  |  |  |
At fair value |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Hedged item, liabilities | (56,596) |  |  |  |  | $ (15,578)
At fair value | USD/INR |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Hedging instrument, assets |  |  |  |  |  | 2,091
Hedged item, liabilities | (16,732) |  |  |  |  |
At fair value | CAD/INR |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Hedging instrument, assets |  |  |  |  |  | 314
Hedged item, liabilities | (5,425) |  |  |  |  |
At fair value | EUR/INR |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Hedged item, liabilities | (17,312) |  |  |  |  | (1,156)
At fair value | GBP/INR |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Hedged item, liabilities | (12,921) |  |  |  |  | (8,700)
At fair value | SEK/INR |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Hedged item, liabilities | (3,075) |  |  |  |  | (720)
At fair value | GBP/EUR |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Hedging instrument, assets | 223 |  |  |  |  |
Hedged item, liabilities |  |  |  |  |  | (5,763)
At fair value | GBP/SEK |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Hedging instrument, assets |  |  |  |  |  | 0
Hedged item, liabilities | (210) |  |  |  |  |
At fair value | EUR/MAD |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Hedged item, liabilities | (87) |  |  |  |  | (548)
At fair value | EUR/CZK |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Hedging instrument, assets | 724 |  |  |  |  |
Hedged item, liabilities |  |  |  |  |  | (473)
At fair value | Others |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Hedged item, liabilities | $ (1,781) |  |  |  |  | $ (623)

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