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Significant Accounting and Reporting Policies - Additional Information (Detail) (JPY ¥)
In Millions, unless otherwise specified
 3 Months Ended 9 Months Ended
Dec. 31, 2011
Year
Dec. 31, 2010
Dec. 31, 2011
Year
Dec. 31, 2010
Mar. 31, 2011
Significant Accounting Policies [Line Items]          
A maximum lag period of recognizing the results of subsidiaries and affiliates     3 months    
Revenues on direct financing leases and installment loans past due policy     The Company and its subsidiaries suspend accruing revenues on past-due installment loans and direct financing leases when principal or interest is past-due 90 days or more, or earlier, if management determines that their collections are doubtful based on factors such as individual debtors’ creditworthiness, historical loss experience, current delinquencies and delinquency trends.    
Available-for-sale securities, recognition of losses related to equity securities policy     For available-for-sale securities, the Company and its subsidiaries generally recognize losses related to equity securities for which the fair value has been significantly below the acquisition cost (or current carrying value if an adjustment has been made in the past) for more than six months.    
Provision for income taxes     ¥ 7,661    
Increase in additional paid-in capital had such stock splits made prior to October 1, 2001     24,674    
Investment in operating lease, accumulated depreciation 413,570   413,570   402,697
Loans held for sale in installment loans 8,896   8,896   13,718
Goodwill 92,685   92,685   94,790
Amortization of policy acquisition costs charged to income 1,853 2,098 6,433 7,015  
Effective income tax rates including discontinued operations 8.40% 38.50% 31.40% 38.70%  
National Corporate tax     30.00%    
Inhabitant tax     6.00%    
Enterprise tax     8.00%    
Statutory income tax rate     40.90%    
Tax losses Carry-forward period 7   7    
Advance and/or progress payments for development of condominiums for sale 86,766   86,766   96,197
Finished goods 8,643   8,643   12,213
Write-down of advance and/or progress payments for development of residential condominiums 1,323 2,548 1,833 2,998  
After Amendment
          
Significant Accounting Policies [Line Items]          
Tax losses Carry-forward period 9   9    
Percentage of taxable income available for deduction     80.00%    
Fiscal years beginning between April 1, 2012 and March 31, 2015
          
Significant Accounting Policies [Line Items]          
Statutory income tax rate     38.30%    
Fiscal year beginning after April 1, 2015
          
Significant Accounting Policies [Line Items]          
Statutory income tax rate     35.90%    
Other Operating Assets
          
Significant Accounting Policies [Line Items]          
Accumulated depreciation 37,826   37,826   34,739
Office Facilities
          
Significant Accounting Policies [Line Items]          
Accumulated depreciation ¥ 39,051   ¥ 39,051   ¥ 39,057