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Stock-Based Compensation - Additional Information (Detail) (JPY ¥) In Millions, unless otherwise specified	12 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Cash received from the exercise of stock options	¥ 863	¥ 345	¥ 55
Unrecognized compensation costs	0
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total intrinsic value of options exercised	403	136	5
Incremental stock-based compensation costs recognized	0	0	0
Stock Options | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average vesting period	1 year 9 months
Weighted average exercise period	9 years 9 months 29 days
Stock Options | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average vesting period	1 year 11 months 1 day
Weighted average exercise period	9 years 11 months 1 day
Stock Compensation Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Points granted	399,000
Points settled for individuals retired	93,250
Points outstanding	2,043,542
Incremental stock-based compensation costs recognized	¥ 609	¥ 410	¥ 288

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- Definition

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Share Based Compensation Arrangement By Share Based Payment Award Points Outstanding Number

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Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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Represents the compensation cost capitalized during the period arising from equity-based compensation arrangements (for example, shares of stock, units, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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Unrecognized cost of unvested options awarded to employees as compensation.

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The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.

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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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