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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%