v3.25.2
Financial Instruments - Schedule of Level 3 Financial Assets Fair Values (Details) - Level 3 - JPY (¥)
¥ in Millions
 12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
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 ¥ 12,293 ¥ 23,806
Recognition of financial assets associated with contingent consideration arrangements 147 0
Changes recognized as finance income (expenses) 516 (702)
Changes in fair value of financial assets associated with contingent consideration due to other elements than time value (1,789) (12,415)
Changes in fair value of financial assets measured at fair value through OCI and exchange differences on translation of foreign operations (970) 1,604
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
As of the end of the year 10,197 12,293
Equity instruments    
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
As of the beginning of the year 88,925 83,236
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 (16,846) 4,900
Purchases 2,843 1,760
Sales (361) (217)
Transfers to Level 1 (1,626) (5,008)
Acquisition from conversion of convertible notes 1,488 4,254
Transfers to investments accounted for using the equity method (809) 0
As of the end of the year ¥ 73,614 ¥ 88,925