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Deferred compensation plans - Activity Relating to SAR Plan B (Parenthetical) (Detail) (JPY ¥)	12 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Weighted-average grant date fair value per share	¥ 397	¥ 638

The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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