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Segmented information - Disclosure of revenue information by location (Details) - CAD ($) $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2022 | Sep. 30, 2021
Disclosure of geographical areas [line items] |  |
Revenue | $ 12,867,201 | $ 12,126,793
Western and Southern Europe |  |
Disclosure of geographical areas [line items] |  |
Revenue | 2,116,082 | 1,903,220
Revenue | 2,152,113 | 1,917,760
Western and Southern Europe | France |  |
Disclosure of geographical areas [line items] |  |
Revenue | 1,846,832 | 1,721,622
Western and Southern Europe | Spain |  |
Disclosure of geographical areas [line items] |  |
Revenue | 111,515 | 33,490
Western and Southern Europe | Portugal |  |
Disclosure of geographical areas [line items] |  |
Revenue | 105,225 | 105,776
Western and Southern Europe | Others |  |
Disclosure of geographical areas [line items] |  |
Revenue | 52,510 | 42,332
U.S. | U.S. |  |
Disclosure of geographical areas [line items] |  |
Revenue | 3,987,025 | 3,510,193
U.S. Commercial and State Government |  |
Disclosure of geographical areas [line items] |  |
Revenue | 2,075,321 | 1,800,747
U.S. Commercial and State Government | U.S. |  |
Disclosure of geographical areas [line items] |  |
Revenue | 2,226,473 | 1,889,999
U.S. Federal |  |
Disclosure of geographical areas [line items] |  |
Revenue | 1,750,902 | 1,607,431
U.S. Federal | U.S. |  |
Disclosure of geographical areas [line items] |  |
Revenue | 1,760,552 | 1,620,194
Canada |  |
Disclosure of geographical areas [line items] |  |
Revenue | 1,981,380 | 1,755,804
Canada | Canada |  |
Disclosure of geographical areas [line items] |  |
Revenue | 2,143,211 | 1,892,246
Scandinavia and Central Europe |  |
Disclosure of geographical areas [line items] |  |
Revenue | 1,652,658 | 1,735,134
Revenue | 1,571,118 | 1,663,470
Scandinavia and Central Europe | Germany |  |
Disclosure of geographical areas [line items] |  |
Revenue | 811,458 | 786,426
Scandinavia and Central Europe | Sweden |  |
Disclosure of geographical areas [line items] |  |
Revenue | 697,941 | 782,581
Scandinavia and Central Europe | Norway |  |
Disclosure of geographical areas [line items] |  |
Revenue | 143,259 | 166,127
U.K. and Australia |  |
Disclosure of geographical areas [line items] |  |
Revenue | 1,472,907 | 1,555,690
Revenue | 1,291,125 | 1,355,603
U.K. and Australia | U.K. |  |
Disclosure of geographical areas [line items] |  |
Revenue | 1,397,161 | 1,487,774
U.K. and Australia | Australia |  |
Disclosure of geographical areas [line items] |  |
Revenue | 75,746 | 67,916
Finland, Poland and Baltics |  |
Disclosure of geographical areas [line items] |  |
Revenue | 762,529 | 792,072
Revenue | 729,024 | 768,994
Finland, Poland and Baltics | Others |  |
Disclosure of geographical areas [line items] |  |
Revenue | 34,676 | 37,660
Finland, Poland and Baltics | Finland |  |
Disclosure of geographical areas [line items] |  |
Revenue | 727,853 | 754,412
Northwest and Central-East Europe |  |
Disclosure of geographical areas [line items] |  |
Revenue | 728,329 | 733,464
Revenue | 692,859 | 716,183
Northwest and Central-East Europe | Others |  |
Disclosure of geographical areas [line items] |  |
Revenue | 64,632 | 73,493
Northwest and Central-East Europe | Netherlands |  |
Disclosure of geographical areas [line items] |  |
Revenue | 494,227 | 479,597
Northwest and Central-East Europe | Denmark |  |
Disclosure of geographical areas [line items] |  |
Revenue | 114,849 | 124,553
Northwest and Central-East Europe | Czech Republic |  |
Disclosure of geographical areas [line items] |  |
Revenue | 54,621 | 55,821
Asia Pacific |  |
Disclosure of geographical areas [line items] |  |
Revenue | 4,460 | 4,774
Revenue | 799,661 | 680,554
Asia Pacific | Others |  |
Disclosure of geographical areas [line items] |  |
Revenue | $ 4,460 | $ 4,774

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