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Selling, General and Administrative Expenses (Summary of Selling, General and Administrative Expenses) (Detail) - JPY (¥)
¥ in Millions
3 Months Ended 6 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Selling, General and Administrative Expense [Abstract]        
Personnel expenses ¥ 84,762 ¥ 77,513 ¥ 171,183 ¥ 154,100
Selling expenses 28,281 21,725 50,807 41,251
Administrative expenses 40,167 34,456 75,881 68,253
Depreciation of office facilities 2,269 2,178 4,394 4,350
Total ¥ 155,479 ¥ 135,872 ¥ 302,265 ¥ 267,954