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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