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Financial instruments by category (Details 4)
 12 Months Ended
Jun. 30, 2020
Level 2 [Member] | Interest rate swaps [Member]  
Statement Line Items [Line Items]  
Description Interest rate swaps
Pricing model / method Cash flows - Theoretical price
Parameters Interest rate futures contracts and cash flows
Level 2 [Member] | Derivative financial instruments Forwards [Member]  
Statement Line Items [Line Items]  
Description Derivative financial instruments Forwards
Pricing model / method Theoretical price
Parameters Underlying asset price and volatility
Level 3 [Member] | Investments in financial assets [Member]  
Statement Line Items [Line Items]  
Description Investments in financial assets - Other private companies’ securities [1]
Pricing model / method Cash flow / NAV - Theoretical price
Parameters Projected revenue discounted at the discount rate The value is calculated in accordance with shares in the equity funds on the basis of their Financial Statements, based on fair value or investments assessments.
Range 1 - 3.5
Level 3 [Member] | Investments in financial assets - Others [member]  
Statement Line Items [Line Items]  
Description Investments in financial assets - Others
Pricing model / method Discounted cash flows - Theoretical price
Parameters Projected revenue discounted at the discount rate The value is calculated in accordance with shares in the equity funds on the basis of their Financial Statements, based on fair value or investment assessments.
Range 1 - 3.5
Level 3 [Member] | Derivative financial instruments Forwards [Member]  
Statement Line Items [Line Items]  
Description Derivative financial instruments Forwards
Pricing model / method Theoretical price
Parameters Underlying asset price and volatility
[1] An increase in the discount rate would decrease the value of investments in private companies, while an increase in projected revenues would increase their value.