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Contingent liabilities and legal proceedings - Acquisition of USL shares from UBHL and related proceedings in relation to the USL transaction (Details) - ₨ / shares
12 Months Ended
Jun. 30, 2023
Jul. 04, 2013
Jun. 30, 2024
Disclosure of contingent liabilities [line items]      
Proportion of ownership interest in subsidiary     100.00%
USL Benefit Trust      
Disclosure of contingent liabilities [line items]      
Proportion of ownership interest in subsidiary     2.38%
United Spirits Limited      
Disclosure of contingent liabilities [line items]      
Percentage of interest acquired   14.98%  
Proportion of ownership interest in subsidiary     55.88%
United Spirits Limited | USL Benefit Trust      
Disclosure of contingent liabilities [line items]      
Ownership interest in associate 2.38%    
United Spirits Limited | UBHL      
Disclosure of contingent liabilities [line items]      
Percentage of interest acquired   6.98%  
Acquisition price per share (in INR per share)   ₨ 1,440