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Cost optimization program	12 Months Ended
Cost optimization program	Sep. 30, 2023
Analysis of income and expense [abstract]
Cost optimization program	Cost optimization program During the year ended September 30, 2023, the Company initiated a cost optimization program to accelerate actions to rightsize its real estate portfolio globally and improve operational efficiencies, including the increased use of automation and global delivery, focused on administrative activities for which the Company recorded $8,964,000 of costs. This amount includes costs for terminations of employment of $2,613,000, accounted for in severance provisions (Note 13), and costs of vacating leased premises of $6,351,000, composed of impairment of right-of-use assets of $2,232,000 (Note 24), onerous supplier contract costs of $2,181,000 as well as impairment of PP&E of $1,938,000 (Note 24) related to leasehold improvements and furniture, fixtures and equipment.