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Commitments, contingencies and guarantees (Tables)
 12 Months Ended
Sep. 30, 2025
Other Provisions, Contingent Liabilities And Contingent Assets [Abstract]  
Disclosure of minimum payments under long-term service and other agreements Minimum payments under these agreements are due as follows:
$
 Less than one year 226,509 
 Between one and three years 214,408 
 Between three and five years 23,106 
 Beyond five years —