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Other comprehensive income (loss) - Changes in Accumulated Other Comprehensive Income (Loss) (Detail) (JPY ¥)
In Millions, unless otherwise specified

3 Months Ended

6 Months Ended

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2014

Sep. 30, 2013

Accumulated other comprehensive income (loss) [Line Items]

Balance at beginning of year

Other comprehensive income (loss) before reclassifications

Reclassifications out of accumulated other comprehensive income (loss)

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Net change during the period

Balance at end of period

Cumulative translation adjustments [Member]

Accumulated other comprehensive income (loss) [Line Items]

Balance at beginning of year

Other comprehensive income (loss) before reclassifications

Reclassifications out of accumulated other comprehensive income (loss)

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Net change during the period

Balance at end of period

Pension liability adjustment [Member]

Accumulated other comprehensive income (loss) [Line Items]

Balance at beginning of year

Other comprehensive income (loss) before reclassifications

Reclassifications out of accumulated other comprehensive income (loss)

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Net change during the period

Balance at end of period

Net unrealized gain on non-trading securities [Member]

Accumulated other comprehensive income (loss) [Line Items]

Balance at beginning of year

Other comprehensive income (loss) before reclassifications

Reclassifications out of accumulated other comprehensive income (loss)

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Net change during the period

Balance at end of period

[1]	Reclassifications out of accumulated other comprehensive income (loss) are as follows:

Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.

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