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Significant Accounting and Reporting Policies - Additional Information (Detail) | 12 Months Ended
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Mar. 31, 2011 USD ($) | Mar. 31, 2011 JPY (¥) | Mar. 31, 2010 JPY (¥) | Mar. 31, 2009 JPY (¥) | Mar. 31, 2011 Other Operating Assets USD ($) | Mar. 31, 2011 Other Operating Assets JPY (¥) | Mar. 31, 2010 Other Operating Assets JPY (¥) | Mar. 31, 2009 Other Operating Assets JPY (¥) | Mar. 31, 2011 Other Operating Assets Property, Plant and Equipment, Other Types Year | Mar. 31, 2011 Other Operating Assets Buildings Year | Mar. 31, 2011 Other Operating Assets Land improvement Year | Mar. 31, 2011 Office Facilities USD ($) | Mar. 31, 2011 Office Facilities JPY (¥) | Mar. 31, 2010 Office Facilities JPY (¥) | Mar. 31, 2009 Office Facilities JPY (¥) | Mar. 31, 2011 Office Facilities Buildings and fixtures Year | Mar. 31, 2011 Office Facilities Machinery and equipment Year | Mar. 31, 2011 Investment in operating leases Transportation equipment Year | Mar. 31, 2011 Investment in operating leases Measuring and information-related equipment Year | Mar. 31, 2011 Investment in operating leases Real Estate Year | Mar. 31, 2011 Investment in operating leases Property, Plant and Equipment, Other Types Year | Mar. 31, 2011 Adjustments for New Accounting Pronouncement Assets JPY (¥) | Mar. 31, 2011 Adjustments for New Accounting Pronouncement Liabilities JPY (¥) | Mar. 31, 2011 Adjustments for New Accounting Pronouncement Retained Earnings JPY (¥)
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
A maximum lag period of recognizing the results of subsidiaries and affiliates | 3M | 3M |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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. | 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. | 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. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase in additional paid-in capital had such stock splits made prior to October 1, 2001 | $ 297,000,000 | ¥ 24,674,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Write-down of advance and/or progress payments for development of residential condominiums | 118,000,000 | 9,844,000,000 | 7,115,000,000 | 10,911,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capitalized interest costs related to specific long-term development projects | 44,000,000 | 3,646,000,000 | 2,810,000,000 | 2,766,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Advertising expense | 74,000,000 | 6,165,000,000 | 6,870,000,000 | 11,280,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated average useful lives |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 8 | 4 | 33 | 7 |  |  |
Depreciation expenses |  |  |  |  | 94,000,000 | 7,849,000,000 | 7,202,000,000 | 6,717,000,000 |  |  |  | 35,000,000 | 2,906,000,000 | 3,153,000,000 | 3,613,000,000 |  |  |  |  |  |  |  |  |
Accumulated depreciation |  |  |  |  | 418,000,000 | 34,739,000,000 | 31,650,000,000 |  |  |  |  | 470,000,000 | 39,057,000,000 | 37,319,000,000 |  |  |  |  |  |  |  |  |  |
Estimated useful lives, maximum |  |  |  |  |  |  |  |  | 20 | 50 | 60 |  |  |  |  | 62 | 20 |  |  |  |  |  |  |
Advance and/or progress payments for development of condominiums for sale | 1,157,000,000 | 96,197,000,000 | 115,285,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finished goods | 147,000,000 | 12,213,000,000 | 37,971,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Translations of Japanese yen into U.S. dollars, prevailing exchange rate | 83.15 | 83.15 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative effect of adopting new accounting pronouncements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | ¥ 1,147,000,000,000 | ¥ 1,169,000,000,000 | ¥ (22,000,000,000)

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- Definition Describes the policy as to when a loan ceases to accrue interest or other revenue because the borrower is in financial difficulty. May also describe the treatment of previously earned but uncollected interest income on loans in nonaccrual status, how cash received from borrowers is recorded on loans that are in nonaccrual status, and the policy for resuming accrual of interest. Also includes the policy for charging off uncollectible loans and trade receivables, and the policy for determining past-due or delinquency status (i.e. whether past-due status is based on how recently payments have been received or on contractual terms). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Statement of Position (SOP) -Number 01-6 -Paragraph 13 -Subparagraph c, g Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 114 -Paragraph 8, 11, 12, 13, 14, 15, 17, 20 + Details
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