v3.26.1
Income Taxes - Schedule of Reconciliation from Income Tax Expense (Benefit) (Details) - JPY (¥)
¥ in Millions
 12 Months Ended
Mar. 31, 2027
Mar. 31, 2026
Mar. 31, 2025
Mar. 31, 2024
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Profit (loss) before tax   ¥ (142,355) ¥ 175,084 ¥ 52,791
Applicable tax rate 31.50% 30.60% 30.60% 30.60%
Income tax expense (benefit) at Takeda’s domestic (Japanese) statutory tax rate of 30.6%   ¥ (43,532) ¥ 53,541 ¥ 16,143
Non-deductible expenses for tax purposes   59,712 25,860 21,353
Changes in unrecognized deferred tax assets and deferred tax liabilities   41,340 45,243 (3,512)
Tax credits   (14,840) (28,371) (30,654)
Differences in applicable tax rates of overseas subsidiaries   (32,538) (39,963) (29,782)
Changes in tax effects of undistributed profit of overseas subsidiaries   2,089 10,282 (1,737)
Effect of changes in applicable tax rates and tax law   (2,939) (6,964) (11,994)
Tax contingencies   (1,309) 426 (83,784)
Effect of prior year items   (8,323) 3,305 (2,479)
Entity reorganizations/Divestments   4,279 2,880 33,469
Other   5,831 702 1,571
Total   9,770 66,941 (91,406)
Tax effect of changes in unrecognized deferred tax assets, deferred tax expense related to interest expense carryforward     21,600  
Gamma Delta T-Cell Therapy Platform And Associated Oncology Programs        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Entity reorganizations/Divestments   14,125    
US state law change        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Effect of changes in applicable tax rates and tax law     (5,809) 4,206
Extension of the carryforward period, Japanese earnings stripping rules        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Effect of changes in applicable tax rates and tax law       (16,200)
Japan tax rate change        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Effect of changes in applicable tax rates and tax law   ¥ (4,797) ¥ (1,155)  
AbbVie break fee case with IRA        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Tax contingencies       ¥ (63,547)