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Employee benefit plans - Amounts in Accumulated Other Comprehensive Income, Pre-Tax, Expected to be Recognized as Components of Net Periodic Benefit Cost Over Next Fiscal Year (Detail) (JPY ¥) In Millions, unless otherwise specified	12 Months Ended
	Mar. 31, 2013
Pension plans, postretirement and other employee benefits [Line items]
Net actuarial loss	¥ 2,653
Net prior service cost	(1,165)
Total	¥ 1,488

The amounts in accumulated other comprehensive income related to gains and losses that are not recognized immediately and are expected to be recognized as components of net periodic benefit cost over the next fiscal year that follows the most recent annual statement of financial position presented.

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- Definition

The amounts in accumulated other comprehensive income related to prior service cost or credit expected to be recognized as components of net periodic benefit cost over the next fiscal year that follows the most recent annual statement of financial position presented.

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- Definition

The aggregate amount in accumulated other comprehensive income expected to be recognized as a component of net periodic benefit cost over the fiscal year that follows the most recent annual statement of financial position presented, including the net gain (loss), net prior service cost or credit, and net transition asset or obligation.

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