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Income Taxes - Additional Information (Detail) (JPY ¥) In Millions, unless otherwise specified	12 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2012
Income Taxes [Line Items]
National Corporate tax	28.00%	28.00%	30.00%
Inhabitant tax	6.00%	6.00%	6.00%
Enterprise tax	8.00%	8.00%	8.00%
Statutory income tax rate	38.30%	38.30%	40.90%
Decrease in provision for income taxes			¥ (6,641)
Net changes in total valuation allowance	9,838	(5,307)	(2,656)
Change in valuation allowance	(1,908)	(4,749)	4,303
Net operating loss carryforwards	¥ 387,269
Amended
Income Taxes [Line Items]
Tax loss carry-forward, period			9 years
Percentage of tax rate deductible from taxable income			80.00%
Before Amendment
Income Taxes [Line Items]
Tax loss carry-forward, period			7 years
Fiscal Years April 1, 2012 Through March 31, 2015
Income Taxes [Line Items]
Statutory income tax rate			38.30%
Fiscal Years After April 1, 2015
Income Taxes [Line Items]
Statutory income tax rate			35.90%
Fiscal fears beginning April 1, 2014
Income Taxes [Line Items]
Statutory income tax rate	35.90%
Before fiscal years beginning on or after October 1, 2014
Income Taxes [Line Items]
Statutory income tax rate for national tax	23.60%
Statutory income tax rate for local tax	12.30%
Fiscal years beginning on or after October 1, 2014
Income Taxes [Line Items]
Statutory income tax rate for national tax	24.60%
Statutory income tax rate for local tax	11.30%

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to deductions. Including, but not limited to, extraterritorial income exclusion deduction, qualified production activity deduction, dividend deduction, deduction for dividend paid to employee stock ownership plan, Medicare prescription drug benefit subsidy deduction, and other deductions.

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Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

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