Trade receivables: Accounts Payable, Current Accounts Accounts Receivable, Gross, Current Accounts Carrying value, as of the balance sheet date, of obligations incurred and payable, pertaining to costs that are statutory in nature, are incurred on contractual obligations, or accumulate over time and for which invoices have not yet been received or will not be rendered. (Examples include taxes, interest, rent and utilities.) or other current obligations not separately disclosed in the balance sheet due to materiality considerations. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). Accrued expenses and other Accrued income taxes Less - accumulated depreciation Less - accumulated depreciation Accumulated other comprehensive loss Accumulated other comprehensive income (loss) Additional Paid in Capital, Common Stock Additional paid-in capital Additional paid-in capital Adjustments, Noncash Items, to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities, Other Other, net Adjustments to reconcile consolidated net income to net cash provided by operating activities Less - Allowance for doubtful receivables Less - Allowance for doubtful receivables Amendment Flag American Depositary Share [Member] American Depositary Share Total assets Total assets ASSETS Total current assets Total current assets Current assets: Buildings ACQUISITION Cash and cash equivalents CASH AND CASH EQUIVALENTS AT END OF YEAR CASH AND CASH EQUIVALENTS AT BEGINNING OF YEAR NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS Cash Paid During Period For [Abstract] CASH PAID DURING THE YEAR FOR- Commitments and contingent liabilities (Note 16) COMMITMENTS AND CONTINGENT LIABILITIES Cash dividends paid Common stock Common stock, Authorized Common stock, Issued Common stock, Outstanding Common stock; Authorized - 1,500,000,000 shares in 2009 and 2010 Issued and outstanding - 744,912,078 shares and 725,679,726 shares in 2009 and 744,912,078 shares and 725,591,355 shares in 2010 Total comprehensive income (loss) Total comprehensive income (loss) Comprehensive income (loss) OTHER COMPREHENSIVE INCOME (LOSS) Construction in progress Cost of Goods and Services Sold Total Cost of sales: Cost of Goods Sold Products Total costs related to post sales and rentals sold during the reporting period. Cost Of Revenue Post Sales And Rentals Post sales and rentals Cumulative effect of a change in accounting principle - adoption of accounting guidance for sabbatical leave and other similar benefits, net of tax Cumulative effect of a change in accounting principle - adoption of accounting guidance for measurement date change for postretirement benefit plans, net of tax Current Fiscal Year End Date Current Represents the noncurrent portion of deferred tax liabilities, which result from applying the applicable tax rate to net taxable temporary differences pertaining to each jurisdiction to which the entity is obligated to pay income tax. A noncurrent taxable temporary difference is a difference between the tax basis and the carrying amount of a noncurrent asset or liability in the financial statements prepared in accordance with generally accepted accounting principles. In a classified statement of financial position, an enterprise shall separate deferred tax liabilities and assets into a current amount and a noncurrent amount. Deferred tax liabilities and assets shall be classified as current or noncurrent based on the classification of the related asset or liability for financial reporting. A deferred tax liability or asset that is not related to an asset or liability for financial reporting, including deferred tax assets related to carryforwards, shall be classified according to the expected reversal date of the temporary difference. And aggregate carrying amount, as of the balance sheet date, of noncurrent obligations not separately disclosed in the balance sheet due to materiality considerations. Noncurrent liabilities are expected to be paid after one year (or the normal operating cycle, if longer). Deferred Income Tax and Other Liabilities, Noncurrent Deferred income taxes and other The current portion of the aggregate tax effects as of the balance sheet date of all future tax deductions arising from temporary differences between tax basis and generally accepted accounting principles basis recognition of assets, liabilities, revenues and expenses, which can only be deducted for tax purposes when permitted under enacted tax laws; after deducting the allocated valuation allowance, if any, to reduce such amount to net realizable value. Deferred tax liabilities and assets shall be classified as current or noncurrent based on the classification of the related asset or liability for financial reporting. A deferred tax liability or asset that is not related to an asset or liability for financial reporting, including deferred tax assets related to carryforwards, shall be classified according to the expected reversal date of the temporary difference. An unrecognized tax benefit that is directly related to a position taken in a tax year that results in a net operating loss carryforward should be presented as a reduction of the related deferred tax asset. And the aggregate carrying amount, as of the balance sheet date, of current assets not separately disclosed in the balance sheet due to materiality considerations. Current assets are expected to be realized or consumed within one year (or the normal operating cycle, if longer). Deferred Tax Assets, Net, and Other Assets, Current Deferred income taxes and other Deferred Deferred income taxes Lease deposits and aggregate carrying amount, as of the balance sheet date, of other noncurrent assets not separately disclosed in the balance sheet due to materiality considerations. Noncurrent assets are expected to be realized or consumed after one year (or the normal operating cycle, if longer). Lease deposits and other Depreciation and amortization DERIVATIVE FINANCIAL INSTRUMENTS Dividends declared and approved to Ricoh Company, Ltd. shareholders Dividends declared and approved to Ricoh Company, Ltd. shareholders Document - Document and Entity Information [Abstract] Document - Document and Entity Information [Abstract] Document Fiscal Period Focus Document Fiscal Year Focus Document Period End Date Document Type Earnings Per ADS Share [Abstract] Per American Depositary Share, each representing 5 shares of common stock: Per share of common stock: The amount of net income or loss for the period per each share of American Depository Receipts outstanding during the reporting period. Earnings Per Share, ADS Basic Basic: The amount of net income or loss for the period per each share of American Depository Receipts and dilutive common stock equivalents outstanding during the reporting period. Earnings Per Share, ADS Diluted Diluted: Earnings Per Share, Basic Basic: Earnings Per Share, Diluted Diluted: PER SHARE DATA EFFECT OF EXCHANGE RATE CHANGE ON CASH AND CASH EQUIVALENTS Entity Central Index Key Entity Common Stock, Shares Outstanding Entity Current Reporting Status Entity [Domain] Entity Filer Category Entity Registrant Name Entity Well-known Seasoned Issuer Equity Component [Domain] DISCLOSURES ABOUT THE FAIR VALUE OF FINANCIAL INSTRUMENTS FAIR VALUE MEASUREMENTS Amount to be collected within one year of the balance sheet date (or one operating cycle, if longer) from outstanding leasing receivables including accrued interest. Current maturities of long-term finance receivables, net Amount to be collected after one year or beyond the operating cycle, if longer, from outstanding leasing receivables including accrued interest. Long-term finance receivables, net Foreign currency exchange loss, net Foreign currency exchange loss, net Losses on disposals and sales of property, plant and equipment Losses on disposals and sales of property, plant and equipment Goodwill GOODWILL AND OTHER INTANGIBLE ASSETS Gross Profit Gross profit Losses on impairment of securities Income before income taxes and equity in earnings of affiliates Income before income taxes and equity in earnings of affiliates Equity in earnings of affiliates Equity in earnings of affiliates, net of dividends received Equity in earnings of affiliates, net of dividends received Income Statement [Abstract] Income Tax Disclosure [Text Block] INCOME TAXES Income Taxes Paid Income taxes Income Tax Expense (Benefit) Total Provision for income taxes: (Increase) decrease in trade receivables (Increase) decrease in trade receivables Decrease in trade payables The net change during the reporting period in accrued income taxes, accrued expenses and other liabilities. (Decrease) increase in accrued income taxes and accrued expenses and other (Increase) decrease in finance receivables (Increase) decrease in finance receivables Decrease in inventories Decrease in inventories Changes in assets and liabilities, net of effects from acquisition- Other intangible assets Interest expense Interest, excluding interest capitalized Finished goods Inventories: Work in process and raw materials Interest and dividend income Interest and dividend income Investments and Other Noncurrent Assets. Total investments and other assets Total investments and other assets Investments and Other Assets [Abstract] Investments and other assets: Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures Investments in and advances to affiliates Investments in and Advances to Affiliates [Text Block] INVESTMENTS IN AND ADVANCES TO AFFILIATES SECURITIES Land Legal Entity [Axis] Total liabilities and equity Total liabilities and equity LIABILITIES AND EQUITY Total current liabilities Total current liabilities Current liabilities: Total long-term liabilities Total long-term liabilities Long-term liabilities: Current maturities of long-term indebtedness Long-term Debt, Excluding Current Maturities Long-term indebtedness Long-term Debt [Text Block] LONG-TERM INDEBTEDNESS The difference between the disposal price and the book value of treasury stock that was disposed during the reporting period. This element refers to the gain (loss). Loss on disposal of treasury stock Machinery and equipment Investment securities Stockholders' Equity Attributable to Noncontrolling Interest Noncontrolling interests Dividends to noncontrolling interests Dividends to noncontrolling interests Purchase of noncontrolling interests Purchase of noncontrolling interests NATURE OF OPERATIONS Net Cash Provided by (Used in) Financing Activities Net cash provided by (used in) financing activities CASH FLOWS FROM FINANCING ACTIVITIES: Net cash used in investing activities Net cash used in investing activities CASH FLOWS FROM INVESTING ACTIVITIES: Net cash provided by operating activities Net cash provided by operating activities CASH FLOWS FROM OPERATING ACTIVITIES: The net change between the beginning and ending balance of treasury stock. Net changes in treasury stock Net income attributable to Ricoh Company, Ltd. Net income attributable to Ricoh Company, Ltd. Net income attributable to noncontrolling interests Noncontrolling interests Nonoperating Income (Expense) Total Other (income) expenses: Notes, Loans and Financing Receivable, Gross, Current Notes Notes Payable, Current Notes Notes to Financial Statements [Abstract] Notes to Financial Statements [Abstract] Operating income Operating income Pension liability adjustments Cumulative translation adjustments Net unrealized gains (losses) on derivative instruments Net unrealized holding gains (losses) on available-for-sale securities Other Cost of Operating Revenue Other revenue Other Nonoperating Income (Expense) Other, net Other Sales Revenue, Net Other revenue Parent Company [Member] Total Ricoh Company, Ltd. shareholders' equity Payments for (Proceeds from) Other Investing Activities Other, net Net cash inflow (outflow) in the total of all time deposits and shall be classified as cash flows from investing activities. (Increase) decrease in time deposits (Increase) decrease in time deposits Payment for purchase of treasury stock Payment for purchase of treasury stock Dividends paid Dividends paid Payments for purchases of available-for-sale securities Payments for purchases of available-for-sale securities Purchase of business, net of cash acquired Purchase of business, net of cash acquired Expenditures for property, plant and equipment, including interest capitalized Expenditures for property, plant and equipment, including interest capitalized PENSION AND RETIREMENT ALLOWANCE PLANS Pension and severance costs, less payments Pension and severance costs, less payments Proceeds from long-term indebtedness Proceeds from issuance of long-term debt securities Proceeds from (Payments for) Other Financing Activities Other, net (Decrease) increase in short-term borrowings, net Proceeds from sales of available-for-sale securities Proceeds from sales of property, plant and equipment Consolidated net income Consolidated net income Property, Plant and Equipment, Gross Total Net property, plant and equipment Net property, plant and equipment Property, plant and equipment, at cost: Repayment of long-term indebtedness Repayment of long-term indebtedness Repayment of long-term debt securities Repayment of long-term debt securities Reporting Segment [Domain] Retained Earnings (Accumulated Deficit) Retained earnings Retained earnings Noncurrent liability for underfunded plans recognized in the balance sheet that is associated with the defined benefit pension plans and other postretirement defined benefit plans. Accrued pension and severance costs Aggregate revenue during the period from post sales and rentals in the normal course of business, after deducting returns, allowances and discounts. Revenue Post Sales And Rentals Post sales and rentals Sales Revenue, Goods, Net Products Total Total Net sales: FINANCE RECEIVABLES SIGNIFICANT SUBSEQUENT EVENTS Schedule II. - Valuation and Qualifying Accounts and Reserves SEGMENT INFORMATION Segment Reporting Information, by Segment [Axis] Selling, general and administrative expenses Short-term borrowings Short-term Debt [Text Block] SHORT-TERM BORROWINGS SIGNIFICANT ACCOUNTING AND REPORTING POLICIES Statement, Equity Components [Axis] Statement [Line Items] Statement of Cash Flows [Abstract] Statement of Financial Position [Abstract] Statement of Stockholders' Equity [Abstract] Statement [Table] Stockholders' Equity Attributable to Parent Total Ricoh Company, Ltd. shareholders' equity Ricoh Company, Ltd. shareholders' equity: Stockholders' Equity - Beginning Balance - As Restated Adjusted Balance, beginning of year Adjusted Balance, beginning of year