v3.26.1
Financial Instruments - Schedule of Level 3 Financial Assets Fair Values (Details) - Level 3 - JPY (¥)
¥ in Millions
 12 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Financial assets associated with contingent consideration arrangements    
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
As of the beginning of the year ¥ 10,197 ¥ 12,293
Recognition of financial assets associated with contingent consideration arrangements 0 147
Changes recognized as finance income (expenses) 564 516
Changes in fair value of financial assets associated with contingent consideration due to other elements than time value (566) (1,789)
Changes in fair value of financial assets measured at fair value through OCI and exchange differences on translation of foreign operations 293 (970)
Purchases 0 0
Sales 0 0
Transfers to Level 1 0 0
Acquisition from conversion of convertible notes 0 0
Transfers to investments accounted for using the equity method 0 0
Transfers from investments accounted for using the equity method 0 0
As of the end of the year 10,488 10,197
Equity instruments    
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
As of the beginning of the year 73,614 88,925
Recognition of financial assets associated with contingent consideration arrangements 0 0
Changes recognized as finance income (expenses) 0 0
Changes in fair value of financial assets associated with contingent consideration due to other elements than time value 0 0
Changes in fair value of financial assets measured at fair value through OCI and exchange differences on translation of foreign operations (10,676) (16,846)
Purchases 3,236 2,843
Sales (777) (361)
Transfers to Level 1 0 (1,626)
Acquisition from conversion of convertible notes 1,500 1,488
Transfers to investments accounted for using the equity method (1,182) (809)
Transfers from investments accounted for using the equity method 591 0
As of the end of the year ¥ 66,306 ¥ 73,614