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Revenues from Contracts with Customers - Summary of Revenues from Contracts with Customers, and Other Sources of Revenue (Detail) - JPY (¥)
¥ in Millions
 3 Months Ended 6 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Revenue From Contract With Customers [Line Items]        
Revenues from contracts with customers ¥ 315,993 ¥ 359,235 ¥ 618,730 ¥ 693,599
Other revenues [1] 366,768 347,768 741,005 671,217
Total revenues ¥ 682,761 ¥ 707,003 ¥ 1,359,735 ¥ 1,364,816
[1] Other revenues are not considered to be within the scope of revenue from contracts with customers, such as life insurance premiums and related investment income, operating leases, finance revenues that include interest income, and others.