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Segment Information (Geographical Revenues and Income before Income Taxes) (Detail) - JPY (¥)
¥ in Millions

3 Months Ended

6 Months Ended

Sep. 30, 2023

Sep. 30, 2022

Sep. 30, 2023

Sep. 30, 2022

Segment Reporting Information [Line Items]

Total Revenues

¥ 682,761

¥ 707,003

¥ 1,359,735

¥ 1,364,816

Income before Income Taxes

95,075

80,560

184,467

166,124

Japan | Reportable Geographical Components

Segment Reporting Information [Line Items]

Total Revenues

509,496

549,794

1,020,846

1,065,266

Income before Income Taxes

66,176

36,346

129,856

87,212

The Americas | Reportable Geographical Components

Segment Reporting Information [Line Items]

Total Revenues

^[1]

64,030

60,575

127,510

109,392

Income before Income Taxes

^[1]

9,069

16,791

20,516

24,916

Other Countries | Reportable Geographical Components

Segment Reporting Information [Line Items]

Total Revenues

^[2]

109,235

96,634

211,379

190,158

Income before Income Taxes

^[2]

¥ 19,830

¥ 27,423

¥ 34,095

¥ 53,996

[1]	Mainly the United States
[2]	Mainly Asia, Europe, Australasia and Middle East

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