v3.26.1
Operating Segment and Revenue Information - Schedule of Revenue by Type of Good or Service (Details) - JPY (¥)
¥ in Millions
12 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Mar. 31, 2024
Disclosure of products and services [line items]      
Revenue from contracts with customers ¥ 4,505,720 ¥ 4,581,551 ¥ 4,263,762
Sales of pharmaceutical products      
Disclosure of products and services [line items]      
Revenue from contracts with customers 4,423,111 4,495,972 4,163,652
Out-licensing and service income      
Disclosure of products and services [line items]      
Revenue from contracts with customers ¥ 82,609 ¥ 85,579 ¥ 100,110