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Amounts Reclassified to Net Income from Accumulated Other Comprehensive Income (loss) (Detail) (JPY ¥)
In Millions, unless otherwise specified
 12 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Mar. 31, 2012
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Brokerage commissions and net gains on investment securities ¥ 27,183 ¥ 34,814 ¥ 29,337
Gains on sales of subsidiaries and affiliates and liquidation losses, net 64,923 7,883 3,317
Life insurance premiums and related investment income 155,406 138,726 126,907
Write-downs of securities and other (7,989) (22,838) (16,470)
Income before Income Taxes and Discontinued Operations 283,726 172,572 127,515
Tax expenses or benefits (97,236) (53,682) (44,608)
Net Income 193,991 119,058 85,901
Interest on loans and investment securities/Interest expense (82,859) (100,966) (109,872)
Foreign currency transaction loss (723) (503) 217
Net unrealized gains (losses) on derivative instruments
      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Net Income (915) (824) 181
Reclassification out of Accumulated Other Comprehensive Income | Net unrealized gains (losses) on investment in securities
      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Brokerage commissions and net gains on investment securities 10,902    
Interest on loans and investment securities 858    
Write-downs of securities and other (2,302)    
Income before Income Taxes and Discontinued Operations 12,188    
Tax expenses or benefits (4,225)    
Net Income 7,963    
Reclassification out of Accumulated Other Comprehensive Income | Net unrealized gains (losses) on investment in securities | Sale of Investments
      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Life insurance premiums and related investment income 3,262    
Reclassification out of Accumulated Other Comprehensive Income | Net unrealized gains (losses) on investment in securities | Amortization of investment securities
      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Life insurance premiums and related investment income (532)    
Reclassification out of Accumulated Other Comprehensive Income | Defined benefit pension plans
      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Amortization of prior service credit 1,262    
Amortization of net actuarial loss (837)    
Amortization of transition obligation (56)    
Income before Income Taxes and Discontinued Operations 369    
Tax expenses or benefits (91)    
Net Income 278    
Reclassification out of Accumulated Other Comprehensive Income | Foreign currency translation adjustments
      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Gains on sales of subsidiaries and affiliates and liquidation losses, net (1,520)    
Income before Income Taxes and Discontinued Operations (1,520)    
Tax expenses or benefits 17    
Net Income (1,503)    
Reclassification out of Accumulated Other Comprehensive Income | Net unrealized gains (losses) on derivative instruments
      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Income before Income Taxes and Discontinued Operations (1,213)    
Tax expenses or benefits 298    
Net Income (915)    
Reclassification out of Accumulated Other Comprehensive Income | Net unrealized gains (losses) on derivative instruments | Interest rate swap agreements
      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Interest on loans and investment securities/Interest expense 39    
Reclassification out of Accumulated Other Comprehensive Income | Net unrealized gains (losses) on derivative instruments | Foreign exchange contracts
      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Foreign currency transaction loss 773    
Reclassification out of Accumulated Other Comprehensive Income | Net unrealized gains (losses) on derivative instruments | Foreign currency swap agreements
      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Interest on loans and investment securities/Interest expense ¥ (2,025)