Trade accounts payable Trade accounts Long-term trade accounts receivable Income taxes payable Accrued expenses Accumulated depreciation Accumulated depreciation Accumulated other comprehensive loss Accumulated Other Comprehensive Income(Loss) Additional Paid in Capital, Common Stock Capital surplus Capital Surplus Adjustments to reconcile net income to net cash provided by (used in) operating activities: Less: Allowance for doubtful non-current receivables Less: Allowance for doubtful non-current receivables This item represents the activity in the total allowance for doubtful accounts, including the balance in the allowance at the beginning and end of each period, additions charged to operations, write-offs charged against the allowance, and other. ALLOWANCE FOR DOUBTFUL ACCOUNTS A valuation allowance for trade notes and accounts receivables due to an Entity within one year (or the normal operating cycle, whichever is longer) that are expected to be uncollectible. Less: Allowance for doubtful notes and accounts receivable Less: Allowance for doubtful notes and accounts receivable Amendment Flag Total Total ASSETS Total current assets Total current assets Current assets: Buildings Cash and cash equivalents Cash and cash equivalents, end of year Cash and cash equivalents, beginning of year Net increase (decrease) in cash and cash equivalents Net increase (decrease) in cash and cash equivalents SUPPLEMENTAL CASH FLOW INFORMATION This element represents the effect of any changes in a parent's ownership interest in a subsidiary except net income (loss), comprehensive income (loss), dividends in and contributions to the subsidiaries. Changes in ownership interests in subsidiaries Commitments and contingencies Commitments and Contingencies Disclosure [Text Block] COMMITMENTS AND CONTINGENCIES Cash dividends paid to Kubota Corporation shareholders, per common share Common Stock Common stock, authorized Common stock, issued Common Stock, Shares, Outstanding Ending Balance, shares Beginning Balance, shares Common stock, authorized 1,874,700,000 shares in 2010 and 2009, respectively issued 1,285,919,180 shares in 2010 and 2009, respectively Comprehensive income (loss) attributable to Kubota Corporation Comprehensive income (loss) attributable to Kubota Corporation Less: Comprehensive income (loss) attributable to the noncontrolling interests Comprehensive income (loss) Comprehensive income (loss) Comprehensive Income Note [Text Block] OTHER COMPREHENSIVE INCOME (LOSS) Construction in progress Cost of revenues Cumulative effect of adopting accounting for uncertainty in income taxes Current Fiscal Year End Date Current Advances received from customers SHORT-TERM BORROWINGS AND LONG-TERM DEBT Deferred Deferred income taxes Depreciation and amortization DERIVATIVE FINANCIAL INSTRUMENTS Disposal Groups, Including Discontinued Operations, Disclosure [Text Block] DISCONTINUED OPERATIONS Cash dividends paid to Kubota Corporation shareholders, 14 Yen, 15 Yen, and 13 Yen in 2010, 2009 and 2008, per common share, respectively Cash dividends paid to Kubota Corporation shareholders, 14 Yen, 15 Yen, and 13 Yen in 2010, 2009 and 2008, per common share, respectively 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 Net income attributable to Kubota Corporation per common share: The amount of net income or loss for the period per each share of common stock outstanding and diluted during the reporting period. Earnings Per Share, Basic and Diluted Total Earnings Per Share, Basic and Diluted [Abstract] Basic and Diluted: Effect of exchange rate changes on cash and cash equivalents Accrued payroll costs 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] FAIR VALUE OF FINANCIAL INSTRUMENTS AND CONCENTRATION OF CREDIT RISK FAIR VALUE MEASUREMENTS Reflects the aggregate carrying amount of retail loan and finance lease receivables, net of unearned income and the allowance for losses. These are collected within one year of the balance sheet date. Short-term finance receivables-net Reflects the aggregate carrying amount of retail loan and finance lease receivables, net of unearned income and the allowance for losses. These are collected after one year of the balance sheet date. Long-term finance receivables-net This element represents the disclosure related to finance receivables due from customers. FINANCE RECEIVABLES Foreign exchange gain (loss)-net The gain (loss) resulting from the sale of a disposal group that is not a discontinued operation and the sale or disposal or impairement of fixed assets. These are included in income from continuing operations before income taxes in the income statement. Other operating expenses Other operating expenses (Gain) loss from disposal of fixed assets-net (Gain) loss from disposal of fixed assets-net Gain (loss) on sales of securities-net (Gain) loss on sales of securities-net Income from continuing operations before income taxes and equity in net income of affiliated companies Income from continuing operations before income taxes and equity in net income of affiliated companies Income from continuing operations Income from continuing operations The amount of income (loss) from continuing operations per each share of common stock outstanding and diluted during the reporting period. Continuing operations Income from discontinued operations, net of taxes The amount of income (loss) from disposition of discontinued operations, net of related tax effect, per each share of common stock outstanding and diluted during the reporting period. Income (Loss) from Discontinued Operations, Net of Tax, Per Basic and Diluted Share Discontinued operations Equity in net income of affiliated companies Equity in net income of affiliated companies Income Statement [Abstract] INCOME TAXES Total income taxes Total income taxes Income taxes: (Increase) decrease in notes and accounts receivable (Increase) decrease in notes and accounts receivable (Increase) decrease in interest in sold receivables (Increase) decrease in interest in sold receivables Increase (decrease) in income taxes payable (Increase) decrease in inventories (Increase) decrease in inventories The net change during the reporting period of the sum of obligations due within one year (or one business cycle) arisen from the acquisition of merchandise, materials, supplies and services used in the production and sale of goods and services; and evidenced by formal promissory notes. Decrease in trade notes and accounts payable Change in assets and liabilities: (Increase) decrease in other current assets (Increase) decrease in other current assets Increase (Decrease) in Other Operating Assets and Liabilities, Net Other Increase (decrease) in other current liabilities Increase (decrease) in accrued retirement and pension costs Increase in noncontrolling interests due to investments to subsidiaries from noncontrolling interest holders . Increase in noncontrolling interests related to contribution Interest Expense Interest expense Inventory Disclosure [Text Block] INVENTORIES Inventory, Net Inventories Interest and dividend income Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures Investments in and loan receivables from affiliated companies Investments in and Advances to Affiliates [Text Block] INVESTMENTS IN AND LOAN RECEIVABLES FROM AFFILIATED COMPANIES Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block] OTHER INVESTMENTS Land Legal Entity [Axis] Liabilities and Stockholders' Equity Total LIABILITIES AND EQUITY Total current liabilities Total current liabilities Current liabilities: Total long-term liabilities Total long-term liabilities Long-term liabilities: REVENUE RECOGNITION FOR LONG-TERM CONTRACTS Current portion of long-term debt Long-term debt Total investments and long-term finance receivables Total investments and long-term finance receivables Investments and long-term finance receivables: Long term investments categorized as available-for-sale and other investments which do not have readily determinable fair value, other than investments in affiliated companies. Long-term Investments Other Than Investments In Affiliates Other investments Machinery and equipment Valuation loss on other investments Valuation loss on other investments Noncontrolling interests Cash dividends paid to noncontriolling interests Cash dividends paid to noncontriolling interests Net Cash Provided by (Used in) Financing Activities Net cash provided by (used in) financing activities Financing activities: Net cash used in investing activities Net cash used in investing activities Investing activities: Net Cash Provided by (Used in) Operating Activities Net cash provided by (used in) operating activities Operating activities: Net income attributable to Kubota Corporation Net income attributable to Kubota Corporation Less: Net income attributable to the noncontrolling interests Non-Controlling Interests Other income (expenses), net Other income (expenses), net Other income (expenses): Carrying value as of the balance sheet date of liabilities payable to vendors for capital expenditure. Notes and accounts payable for capital expenditures Notes And Accounts Receivables, Net, Current [Abstract] Notes and accounts receivable: An amount representing an agreement evidenced by formal promissory notes by the maker to pay the Company (holder) a definite sum of money within one year from the balance sheet date (or the normal operating cycle, whichever is longer), for goods or services (including trade receivables) that have been delivered or sold in the normal course of business. Trade notes Notes to Financial Statements [Abstract] Notes to Financial Statements [Abstract] Operating income Operating income Legal Reserve Other current assets Other Assets, Noncurrent Other Pension liability adjustments Foreign currency translation adjustments Total other comprehensive income (loss) Total other comprehensive income (loss) Other comprehensive income (loss) Other comprehensive income (loss), net of tax: Unrealized gains (losses) on derivatives Unrealized gains (losses) on securities Other current liabilities Other long-term liabilities Other-net Parent Company [Member] Payments for (Proceeds from) Other Investing Activities Other Purchases of treasury stock Purchases of treasury stock Cash dividends Cash dividends Increase in finance receivables Increase in finance receivables The cash outflow associated with the purchase of all investments (debt, security, other) during the period and the net change during the reporting period in outstanding loans. Purchases of investments and change in loan receivables Purchases of investments and change in loan receivables Purchases of fixed assets Purchases of fixed assets RETIREMENT AND PENSION PLANS Accrued retirement and pension costs Proceeds from issuance of long-term debt Proceeds from (Payments for) Other Financing Activities Other Net increase (decrease) in short-term borrowings Collection of finance receivables Proceeds from sales and redemption of investments Proceeds from sales of property, plant, and equipment Net income Net income Property, Plant and Equipment, Gross Total Net property, plant, and equipment Net property, plant, and equipment Property, plant, and equipment: The cash outflow to return capital to noncontrolled interest, which generally occurs when noncontrolling shareholders reduce their ownership stake (in a subsidiary of the entity). Purchases of noncontrolling interests Purchases of noncontrolling interests Repayments of Long-term Debt Repayments of long-term debt Retained Earnings (Accumulated Deficit) Retained earnings Retained Earnings, Appropriated Legal reserve Retained Earnings Revenues SUPPLEMENTAL EXPENSE INFORMATION SUBSEQUENT EVENTS SEGMENT INFORMATION Selling, general, and administrative expenses Short-term borrowings SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Statement, Equity Components [Axis] Statement [Line Items] Statement of Cash Flows [Abstract] Statement of Financial Position [Abstract] Statement of Income and Comprehensive Income [Abstract] Statement of Stockholders' Equity [Abstract] Statement [Table] Total Kubota Corporation shareholders' equity Total Kubota Corporation shareholders' equity Kubota Corporation shareholders' equity: Total equity Ending Balance Beginning Balance Total equity Equity: SHAREHOLDERS' EQUITY Total Other Assets Total Other Assets Total other assets Total Other Assets [Abstract] Other assets: Carrying value as of the balance sheet date of agreement evidenced by formal promissory notes by the Company related to payable to vendors for goods and services received that are used in an entity's business. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). Trade notes payable Trading Symbol SECURITIZATION OF RECEIVABLES Treasury Stock at Cost