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Income Taxes (Income before Income Taxes and Provision for Income Taxes) (Detail) - JPY (¥) ¥ in Millions | 12 Months Ended
--- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Mar. 31, 2022
Income Taxes [Line Items] |  |  |
Income before Income Taxes, Japan | ¥ 298,321 | ¥ 201,168 | ¥ 315,922
Income before Income Taxes, Overseas | 171,654 | 191,010 | 193,525
Income before Income Taxes | 469,975 | 392,178 | 509,447
Current provision for income taxes | 111,388 | 58,298 | 175,056
Deferred provision for income taxes | 20,000 | 36,947 | 11,538
Provision for income taxes | 131,388 | 95,245 | 186,594
Japan |  |  |
Income Taxes [Line Items] |  |  |
Current provision for income taxes | 80,274 | 30,808 | 136,623
Deferred provision for income taxes | 9,049 | 22,047 | (1,301)
Overseas |  |  |
Income Taxes [Line Items] |  |  |
Current provision for income taxes | 31,114 | 27,490 | 38,433
Deferred provision for income taxes | ¥ 10,951 | ¥ 14,900 | ¥ 12,839

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