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Financial risk management and financial instruments - Financing Risk and Credit rating (Details)
 12 Months Ended
Apr. 30, 2022
Jun. 30, 2022
Oct. 18, 2021
Minimum      
Capital allocation      
Target minimum average time to maturity for long-term borrowings   2 years  
Funds From Operations (FFO)/Net debt     30.00%
Period to maintain strong liquidity 12 months    
Maximum      
Capital allocation      
Debt/EBITDA to be sustained 2.5    
Period to maintain strong liquidity 18 months