v3.26.1
Income taxes (Details 5) - INR (₨)
₨ in Millions
 12 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Disclosure Of Movement in deferred tax assets and liabilities [Line Items]    
Balance, at the beginning ₨ 4,400 ₨ 9,865
Recognized in income statement 2,085 3,052
Recognized in OCI 383 (34)
Acquired in business combination   (8,483)
Balance, at the end 6,868 4,400
Inventories [Member]    
Disclosure Of Movement in deferred tax assets and liabilities [Line Items]    
Balance, at the beginning 4,626 4,372
Recognized in income statement 2,004 254
Recognized in OCI 0 0
Acquired in business combination   0
Balance, at the end 6,630 4,626
Trade and other receivables [Member]    
Disclosure Of Movement in deferred tax assets and liabilities [Line Items]    
Balance, at the beginning 8,390 5,815
Recognized in income statement 1,247 2,575
Recognized in OCI 0 0
Acquired in business combination   0
Balance, at the end 9,637 8,390
Operating/other tax loss carry-forward [Member]    
Disclosure Of Movement in deferred tax assets and liabilities [Line Items]    
Balance, at the beginning 2,844 2,398
Recognized in income statement 347 446
Recognized in OCI 0 0
Acquired in business combination   0
Balance, at the end 3,191 2,844
Other current assets and other current liabilities, net [Member]    
Disclosure Of Movement in deferred tax assets and liabilities [Line Items]    
Balance, at the beginning 541 645
Recognized in income statement 292 (104)
Recognized in OCI 0 0
Acquired in business combination   0
Balance, at the end 833 541
Lease Liabilities [Member]    
Disclosure Of Movement in deferred tax assets and liabilities [Line Items]    
Balance, at the beginning 1,205 854
Recognized in income statement 2,313 351
Recognized in OCI 0 0
Acquired in business combination   0
Balance, at the end 3,518 1,205
Right of use asset [Member]    
Disclosure Of Movement in deferred tax assets and liabilities [Line Items]    
Balance, at the beginning (1,102) (750)
Recognized in income statement (2,015) (352)
Recognized in OCI 0 0
Acquired in business combination   0
Balance, at the end (3,117) (1,102)
Property, plant and equipment [Member]    
Disclosure Of Movement in deferred tax assets and liabilities [Line Items]    
Balance, at the beginning (5,067) (3,621)
Recognized in income statement (1,023) (1,446)
Recognized in OCI 0 0
Acquired in business combination   0
Balance, at the end (6,090) (5,067)
Other intangible assets [Member]    
Disclosure Of Movement in deferred tax assets and liabilities [Line Items]    
Balance, at the beginning (7,050) 102
Recognized in income statement (1,025) 1,331
Recognized in OCI 0 0
Acquired in business combination   (8,483)
Balance, at the end (8,075) (7,050)
Others [Member]    
Disclosure Of Movement in deferred tax assets and liabilities [Line Items]    
Balance, at the beginning 13 50
Recognized in income statement (55) (3)
Recognized in OCI 383 (34)
Acquired in business combination   0
Balance, at the end ₨ 341 ₨ 13