Leases - average lease terms and discount rates (Details)	Aug. 31, 2024	Aug. 31, 2023
Weighted average remaining lease term in years
Operating leases	9 years 2 months 12 days	9 years 7 months 6 days
Finance leases	17 years 7 months 6 days	17 years 4 months 24 days
Weighted average discount rate
Operating leases	5.60%	5.35%
Finance leases	5.18%	5.25%