2.0.0.10 false Consolidated Balance Sheets (JPY ¥) 103 - Statement - Consolidated Balance Sheets true false In Millions false false 1 usd ¥ false false iso4217_JPY Standard http://www.xbrl.org/2003/iso4217 JPY iso4217 0 iso4217_JPY_per_shares Divide http://www.xbrl.org/2003/iso4217 JPY iso4217 http://www.xbrl.org/2003/instance shares 0 shares Standard http://www.xbrl.org/2003/instance shares 0 false 2 usd ¥ false false iso4217_JPY Standard http://www.xbrl.org/2003/iso4217 JPY iso4217 0 iso4217_JPY_per_shares Divide http://www.xbrl.org/2003/iso4217 JPY iso4217 http://www.xbrl.org/2003/instance shares 0 shares Standard http://www.xbrl.org/2003/instance shares 0 6 Current assets: 4 us-gaap_AssetsCurrentAbstract us-gaap true na duration string No definition available. false false false false false true false false false false false false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false No definition available. false 7 Cash and cash equivalents 5 us-gaap_CashAndCashEquivalentsAtCarryingValue us-gaap true debit instant monetary No definition available. false false false false false false false false false false false false 1 true true false false 111428000000 111428 false false false 2 true true false false 69505000000 69505 false false false Includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the Entity may deposit additional funds at any time and also effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months. Compensating balance arrangements that do not legally restrict the withdrawal or usage of cash amounts may be reported as Cash and Cash Equivalents, while legally restricted deposits held as compensating balances against borrowing arrangements, contracts entered into with others, or company statements of intention with regard to particular deposits should not be reported as cash and cash equivalents. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 7, 26 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 8, 9 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 7 -Footnote 1 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 1 -Article 5 false 8 Notes and accounts receivable: 5 kub_NotesAndAccountsReceivablesNetCurrentAbstract kub false na duration string Notes And Accounts Receivables, Net, Current [Abstract] false false false false false true false false false false false false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false Notes And Accounts Receivables, Net, Current [Abstract] false 9 Trade notes 6 kub_NotesReceivableGrossCurrent kub false debit instant monetary An amount representing an agreement evidenced by formal promissory notes by the maker to pay the Company (holder) a definite... false false false false false false false false false false false false 1 false true false false 57412000000 57412 false false false 2 false true false false 65429000000 65429 false false false 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. No authoritative reference available. false 10 Trade accounts 6 us-gaap_AccountsReceivableGrossCurrent us-gaap true debit instant monetary No definition available. false false false false false false false false false false false false 1 false true false false 317485000000 317485 false false false 2 false true false false 324583000000 324583 false false false Amounts due from customers or clients, within one year of 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. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 3 -Subparagraph a, b -Article 5 false 11 Less: Allowance for doubtful notes and accounts receivable 6 kub_AllowanceForDoubtfulTradeNotesAndAccountsReceivableCurrent kub false credit instant monetary A valuation allowance for trade notes and accounts receivables due to an Entity within one year (or the normal operating... false false false false false false false false false false true negated false 1 false true false false -2821000000 -2821 false false false 2 false true false false -2512000000 -2512 false false false 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. No authoritative reference available. false 12 Short-term finance receivables-net 5 kub_FinanceReceivablesCurrent kub false debit instant monetary Reflects the aggregate carrying amount of retail loan and finance lease receivables, net of unearned income and the allowance... false false false false false false false false false false false false 1 false true false false 104840000000 104840 false false false 2 false true false false 97292000000 97292 false false false 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. No authoritative reference available. false 13 Inventories 5 us-gaap_InventoryNet us-gaap true debit instant monetary No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 172323000000 172323 false false false 2 false true false false 207401000000 207401 false false false Carrying amount (lower of cost or market) as of the balance sheet date of inventories less all valuation and other allowances. Excludes noncurrent inventory balances (expected to remain on hand past one year or one operating cycle, if longer). No authoritative reference available. false 14 Other current assets 5 us-gaap_OtherAssetsCurrent us-gaap true debit instant monetary No definition available. false false false false false false false false false false false false 1 false true false false 60161000000 60161 false false false 2 false true false false 54648000000 54648 false false false Aggregate carrying amount, as of the balance sheet date, of current assets not separately presented elsewhere in the balance sheet. Current assets are expected to be realized or consumed within one year (or the normal operating cycle, if longer). Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 8 -Article 5 false 15 Total current assets 5 us-gaap_AssetsCurrent us-gaap true debit instant monetary No definition available. false false false false false false false false false false false totallabel false 1 false true false false 820828000000 820828 false false false 2 false true false false 816346000000 816346 false false false Sum of the carrying amounts as of the balance sheet date of all assets that are expected to be realized in cash, sold, or consumed within one year (or the normal operating cycle, if longer). Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 9 -Article 5 true 16 Investments and long-term finance receivables: 4 us-gaap_LongTermInvestmentsAndReceivablesNetAbstract us-gaap true na duration string No definition available. false false false false false true false false false false false false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false No definition available. false 17 Investments in and loan receivables from affiliated companies 5 us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures us-gaap true debit instant monetary No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 15945000000 15945 false false false 2 false true false false 14511000000 14511 false false false Total investments in (A) an entity in which the entity has significant influence, but does not have control, (B) subsidiaries that are not required to be consolidated and are accounted for using the equity and or cost method, and (C) an entity in which the reporting entity shares control of the entity with another party or group. Includes long-term advances receivable form a party that is affiliated with the reporting entity by means of direct or indirect ownership. No authoritative reference available. false 18 Other investments 5 kub_LongTermInvestmentsOtherThanInvestmentsInAffiliates kub false debit instant monetary Long term investments categorized as available-for-sale and other investments which do not have readily determinable fair... false false false false false false false false false false false verboselabel false 1 false true false false 109306000000 109306 false false false 2 false true false false 96197000000 96197 false false false 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. No authoritative reference available. false 19 Long-term finance receivables-net 5 kub_FinanceReceivablesNoncurrent kub false debit instant monetary Reflects the aggregate carrying amount of retail loan and finance lease receivables, net of unearned income and the allowance... false false false false false false false false false false false false 1 false true false false 196473000000 196473 false false false 2 false true false false 169257000000 169257 false false false 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. No authoritative reference available. false 20 Total investments and long-term finance receivables 5 us-gaap_LongTermInvestmentsAndReceivablesNet us-gaap true debit instant monetary No definition available. false false false false false false false false false false false totallabel false 1 false true false false 321724000000 321724 false false false 2 false true false false 279965000000 279965 false false false The total amount of investments that are intended to be held for an extended period of time (longer than one operating cycle) and amount due to the Entity from outside sources, including trade accounts receivable, notes and loans receivable, as well as any other types of receivables, net of allowances established for the purpose of reducing such investments and receivables to an amount that approximates their net realizable value. No authoritative reference available. true 21 Property, plant, and equipment: 4 us-gaap_PropertyPlantAndEquipmentNetAbstract us-gaap true na duration string No definition available. false false false false false true false false false false false false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false No definition available. false 22 Land 5 us-gaap_Land us-gaap true debit instant monetary No definition available. false false false false false false false false false false false false 1 false true false false 89664000000 89664 false false false 2 false true false false 90479000000 90479 false false false Carrying amount as of the balance sheet date of real estate held for productive use. This excludes land held for sale. No authoritative reference available. false 23 Buildings 5 us-gaap_BuildingsAndImprovementsGross us-gaap true debit instant monetary No definition available. false false false false false false false false false false false false 1 false true false false 214329000000 214329 false false false 2 false true false false 208901000000 208901 false false false Carrying amount as of the balance sheet date of long-lived, depreciable assets that include building structures held for productive use including any addition, improvement, or renovation to the structure, such as interior masonry, interior flooring, electrical, and plumbing. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 12 -Paragraph 5 false 24 Machinery and equipment 5 us-gaap_MachineryAndEquipmentGross us-gaap true debit instant monetary No definition available. false false false false false false false false false false false false 1 false true false false 358354000000 358354 false false false 2 false true false false 361323000000 361323 false false false Carrying amount as of the balance sheet date of long-lived, depreciable asset used in production process to produce goods and services. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 12 -Paragraph 5 false 25 Construction in progress 5 us-gaap_ConstructionInProgressGross us-gaap true debit instant monetary No definition available. false false false false false false false false false false false false 1 false true false false 5306000000 5306 false false false 2 false true false false 6970000000 6970 false false false Carrying amount at the balance sheet date of long-lived asset under construction that include construction costs to date on capital projects that have not been completed and assets being constructed that are not ready to be placed into service. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 12 -Paragraph 5 false 26 Total 5 us-gaap_PropertyPlantAndEquipmentGross us-gaap true debit instant monetary No definition available. false false false false false false false false false false false totallabel false 1 false true false false 667653000000 667653 false false false 2 false true false false 667673000000 667673 false false false Carrying amount at the balance sheet date for long-lived physical assets used in the normal conduct of business and not intended for resale. This can include land, physical structures, machinery, vehicles, furniture, computer equipment, construction in progress, and similar items. Amount does not include depreciation. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 12 -Paragraph 5 true 27 Accumulated depreciation 5 us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment us-gaap true credit instant monetary No definition available. false false false false false false false false false false true negated false 1 false true false false -446760000000 -446760 false false false 2 false true false false -442052000000 -442052 false false false The cumulative amount of depreciation, depletion and amortization (related to property, plant and equipment, but not including land) that has been recognized in the income statement. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 12 -Paragraph 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 12 -Paragraph 5 -Subparagraph c Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 14 -Article 5 false 28 Net property, plant, and equipment 5 us-gaap_PropertyPlantAndEquipmentNet us-gaap true debit instant monetary No definition available. false false false false false false false false false false false totallabel false 1 false true false false 220893000000 220893 false false false 2 false true false false 225621000000 225621 false false false Tangible assets that are held by an entity for use in the production or supply of goods and services, for rental to others, or for administrative purposes and that are expected to provide economic benefit for more than one year; net of accumulated depreciation. Examples include land, buildings, and production equipment. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 13 -Subparagraph a -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 12 -Paragraph 5 -Subparagraph b, c Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 8 -Article 7 true 29 Other assets: 4 kub_TotalOtherAssetsAbstract kub false na duration string Total Other Assets [Abstract] false false false false false true false false false false false false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false Total Other Assets [Abstract] false 30 Long-term trade accounts receivable 5 us-gaap_AccountsReceivableGrossNoncurrent us-gaap true debit instant monetary No definition available. false false false false false false false false false false false false 1 false true false false 26688000000 26688 false false false 2 false true false false 27071000000 27071 false false false Amounts due from customers or clients, more than one year from the balance sheet date, for goods or services that have been delivered or sold in the normal course of business. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 3 -Article 5 false 31 Other 5 us-gaap_OtherAssetsNoncurrent us-gaap true debit instant monetary No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 19670000000 19670 false false false 2 false true false false 37680000000 37680 false false false Aggregate carrying amount, as of the balance sheet date, of 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). Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 17 -Article 5 false 32 Less: Allowance for doubtful non-current receivables 5 us-gaap_AllowanceForDoubtfulAccountsReceivableNoncurrent us-gaap true credit instant monetary No definition available. false false false false false false false false false false true negated false 1 false true false false -770000000 -770 false false false 2 false true false false -859000000 -859 false false false A valuation allowance for receivables due to an Entity for more than one year from the balance sheet date that are expected to be uncollectible. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 4 -Article 5 false 33 Total other assets 5 kub_TotalOtherAssets kub false debit instant monetary Total Other Assets false false false false false false false false false false false totallabel false 1 false true false false 45588000000 45588 false false false 2 false true false false 63892000000 63892 false false false Total Other Assets No authoritative reference available. true 34 Total 4 us-gaap_Assets us-gaap true debit instant monetary No definition available. false false false false false false false false false false false totallabel false 1 false true false false 1409033000000 1409033 false false false 2 false true false false 1385824000000 1385824 false false false Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Concepts (CON) -Number 6 -Paragraph 25 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 18 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 12 -Article 7 true 36 Current liabilities: 4 us-gaap_LiabilitiesCurrentAbstract us-gaap true na duration string No definition available. false false false false false true false false false false false false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false No definition available. false 37 Short-term borrowings 5 us-gaap_ShortTermBorrowings us-gaap true credit instant monetary No definition available. false false false false false false false false false false false false 1 false true false false 88333000000 88333 false false false 2 false true false false 132100000000 132100 false false false Reflects the total carrying amount as of the balance sheet date of debt having initial terms less than one year or the normal operating cycle, if longer. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19 -Subparagraph a -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 13 -Subparagraph 2, 3 -Article 9 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Subparagraph a(1) -Article 7 false 38 Trade notes payable 5 kub_TradeNotesPayableCurrent kub false credit instant monetary Carrying value as of the balance sheet date of agreement evidenced by formal promissory notes by the Company related to... false false false false false false false false false false false false 1 false true false false 14266000000 14266 false false false 2 false true false false 16405000000 16405 false false false 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). No authoritative reference available. false 39 Trade accounts payable 5 us-gaap_AccountsPayableCurrent us-gaap true credit instant monetary No definition available. false false false false false false false false false false false false 1 false true false false 143683000000 143683 false false false 2 false true false false 163222000000 163222 false false false Carrying value as of the balance sheet date of liabilities incurred (and for which invoices have typically been received) and 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). Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19 -Subparagraph a -Article 5 false 40 Advances received from customers 5 us-gaap_CustomerAdvancesCurrent us-gaap true credit instant monetary No definition available. false false false false false false false false false false false false 1 false true false false 3397000000 3397 false false false 2 false true false false 6306000000 6306 false false false The current portion, due within one year or the normal operating cycle, if longer, of prepayments received from customers for goods or services to be provided in the future. No authoritative reference available. false 41 Notes and accounts payable for capital expenditures 5 kub_NotesAndAccountsPayableForCapitalExpenditures kub false credit instant monetary Carrying value as of the balance sheet date of liabilities payable to vendors for capital expenditure. false false false false false false false false false false false false 1 false true false false 9245000000 9245 false false false 2 false true false false 13301000000 13301 false false false Carrying value as of the balance sheet date of liabilities payable to vendors for capital expenditure. No authoritative reference available. false 42 Accrued payroll costs 5 us-gaap_EmployeeRelatedLiabilitiesCurrent us-gaap true credit instant monetary No definition available. false false false false false false false false false false false false 1 false true false false 25856000000 25856 false false false 2 false true false false 26266000000 26266 false false false Total of the carrying values as of the balance sheet date of obligations incurred through that date and payable for obligations related to services received from employees, such as accrued salaries and bonuses, payroll taxes and fringe benefits. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20 -Article 5 false 43 Accrued expenses 5 us-gaap_AccruedLiabilitiesCurrent us-gaap true credit instant monetary No definition available. false false false false false false false false false false false false 1 false true false false 27352000000 27352 false false false 2 false true false false 25717000000 25717 false false false 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. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20 -Article 5 false 44 Income taxes payable 5 us-gaap_AccruedIncomeTaxesCurrent us-gaap true credit instant monetary No definition available. false false false false false false false false false false false false 1 false true false false 22842000000 22842 false false false 2 false true false false 4733000000 4733 false false false Carrying amount as of the balance sheet date of the unpaid sum of the known and estimated amounts payable to satisfy all currently due domestic and foreign income tax obligations. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 15 -Subparagraph b(1) -Article 7 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 15 -Article 9 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20 -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Interpretation (FIN) -Number 48 -Paragraph 15, 21 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 109 -Section Appendix E -Paragraph 289 false 45 Other current liabilities 5 us-gaap_OtherLiabilitiesCurrent us-gaap true credit instant monetary No definition available. false false false false false false false false false false false false 1 false true false false 33832000000 33832 false false false 2 false true false false 45947000000 45947 false false false Aggregate carrying amount, as of the balance sheet date, of current obligations not separately disclosed in the balance sheet due to materiality considerations. Current liabilities are expected to be paid within one year (or the normal operating cycle, if longer). Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 43 -Chapter 3 -Section A -Paragraph 8 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 6 -Paragraph 15 false 46 Current portion of long-term debt 5 us-gaap_LongTermDebtCurrent us-gaap true credit instant monetary No definition available. false false false false false false false false false false false false 1 false true false false 71432000000 71432 false false false 2 false true false false 60378000000 60378 false false false Total of the portions of the carrying amounts as of the balance sheet date of long-term debt, which may include notes payable, bonds payable, debentures, mortgage loans, and commercial paper, which are scheduled to be repaid within one year or the normal operating cycle, if longer, and after deducting unamortized discount or premiums, if any. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19 -Article 5 false 47 Total current liabilities 5 us-gaap_LiabilitiesCurrent us-gaap true credit instant monetary No definition available. false false false false false false false false false false false totallabel false 1 false true false false 440238000000 440238 false false false 2 false true false false 494375000000 494375 false false false Total obligations incurred as part of normal operations that are expected to be paid during the following twelve months or within one business cycle, if longer. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 21 -Article 5 true 48 Long-term liabilities: 4 us-gaap_LiabilitiesNoncurrentAbstract us-gaap true na duration string No definition available. false false false false false true false false false false false false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false No definition available. false 49 Long-term debt 5 us-gaap_LongTermDebtNoncurrent us-gaap true credit instant monetary No definition available. false false false false false false false false false false false false 1 false true false false 243333000000 243333 false false false 2 false true false false 208588000000 208588 false false false Sum of the carrying values as of the balance sheet date of all long-term debt, which is debt initially having maturities due after one year from the balance sheet date or beyond the operating cycle, if longer, but excluding the portions thereof scheduled to be repaid within one year (current maturities) or the normal operating cycle, if longer, and after deducting unamortized discount or premiums, if any. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 false 50 Accrued retirement and pension costs 5 us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent us-gaap true credit instant monetary No definition available. false false false false false false false false false false false false 1 false true false false 40177000000 40177 false false false 2 false true false false 56591000000 56591 false false false This represents the 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. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph c Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 6 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 3 false 51 Other long-term liabilities 5 us-gaap_OtherLiabilitiesNoncurrent us-gaap true credit instant monetary No definition available. false false false false false false false false false false false false 1 false true false false 13666000000 13666 false false false 2 false true false false 10027000000 10027 false false false 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). Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 24 -Article 5 false 52 Total long-term liabilities 5 us-gaap_LiabilitiesNoncurrent us-gaap true credit instant monetary No definition available. false false false false false false false false false false false totallabel false 1 false true false false 297176000000 297176 false false false 2 false true false false 275206000000 275206 false false false Total obligations incurred as part of normal operations that is expected to be repaid beyond the following twelve months or one business cycle. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22, 23, 24, 25, 26, 27 -Article 5 true 53 Commitments and contingencies 4 us-gaap_CommitmentsAndContingencies2009 us-gaap true na duration string No definition available. false false false false false false false false false false false false 1 false false false false 0 0     false false false 2 false false false false 0 0     false false false Represents the caption on the face of the balance sheet to indicate that the entity has entered into (1) purchase or supply arrangements that will require expending a portion of its resources to meet the terms thereof, and (2) is exposed to potential losses or, less frequently, gains, arising from (a) possible claims against a company's resources due to future performance under contract terms, and (b) possible losses or likely gains from uncertainties that will ultimately be resolved when one or more future events that are deemed likely to occur do occur or fail to occur. This caption alerts the reader that one or more notes to the financial statements disclose pertinent information about the entity's commitments and contingencies. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 19 -Article 7 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 5 -Paragraph 8, 9 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 25 -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 17 -Article 9 false 55 Kubota Corporation shareholders' equity: 5 us-gaap_StockholdersEquityAbstract us-gaap true na duration string No definition available. false false false false false true false false false false false false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false No definition available. false 56 Common stock, authorized 1,874,700,000 shares in 2010 and 2009, respectively issued 1,285,919,180 shares in 2010 and 2009, respectively 6 us-gaap_CommonStockValue us-gaap true credit instant monetary No definition available. false false false false false false false false false false false false 1 false true false false 84070000000 84070 false false false 2 false true false false 84070000000 84070 false false false Dollar value of issued common stock whether issued at par value, no par or stated value. This item includes treasury stock repurchased by the entity. Note: elements for number of common shares, par value and other disclosure concepts are in another section within stockholders' equity. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 30 -Article 5 false 57 Capital surplus 6 us-gaap_AdditionalPaidInCapitalCommonStock us-gaap true credit instant monetary No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 89241000000 89241 false false false 2 false true false false 93150000000 93150 false false false Value received from shareholders in common stock-related transactions that are in excess of par value or stated value and amounts received from other stock-related transactions. Includes only common stock transactions (excludes preferred stock transactions). May be called contributed capital, capital in excess of par, capital surplus, or paid-in capital. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 31 -Article 5 false 58 Legal reserve 6 us-gaap_RetainedEarningsAppropriated us-gaap true credit instant monetary No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 19539000000 19539 false false false 2 false true false false 19539000000 19539 false false false A segregation of retained earnings which is unavailable for dividend distribution. Includes also retained earnings appropriated for loss contingencies. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 31 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 5 -Paragraph 15 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 24 -Subparagraph a(4) -Article 7 false 59 Retained earnings 6 us-gaap_RetainedEarningsAccumulatedDeficit us-gaap true credit instant monetary No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 477303000000 477303 false false false 2 false true false false 452791000000 452791 false false false The cumulative amount of the reporting entity's undistributed earnings or deficit. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 12 -Paragraph 10 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 31 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 false 60 Accumulated other comprehensive loss 6 us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax us-gaap true credit instant monetary No definition available. false false false false false false false false false false false false 1 false true false false -34491000000 -34491 false false false 2 false true false false -62184000000 -62184 false false false Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at fiscal year-end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, and unrealized gains and losses on certain investments in debt and equity securities as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 12 -Paragraph 10 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 130 -Paragraph 14, 17, 26 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 31 -Article 5 false 61 Treasury stock (14,072,545 shares and 13,856,291 shares in 2010 and 2009, respectively), at cost 6 us-gaap_TreasuryStockValue us-gaap true debit instant monetary No definition available. false false false false false false false false false false true negated false 1 false true false false -9265000000 -9265 false false false 2 false true false false -9082000000 -9082 false false false Value of common and preferred shares of an entity that were issued, repurchased by the entity, and are held in its treasury. Treasury stock is issued but is not outstanding. This stock has no voting rights and receives no dividends. Note that treasury stock may be recorded at its total cost or separately as par (or stated) value and additional paid in capital. Note: number of treasury shares concept is in another section within stockholders' equity. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Technical Bulletin (FTB) -Number 85-6 -Paragraph 3 false 62 Total Kubota Corporation shareholders' equity 6 us-gaap_StockholdersEquity us-gaap true credit instant monetary No definition available. false false false false false false false false false false false totallabel false 1 false true false false 626397000000 626397 false false false 2 false true false false 578284000000 578284 false false false Total of all Stockholders' Equity (deficit) items, net of receivables from officers, directors owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph A3 -Appendix A Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 4 -Section E Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30, 31 -Article 5 true 63 Noncontrolling interests 5 us-gaap_MinorityInterest us-gaap true credit instant monetary No definition available. false false false false false false false false false false false false 1 false true false false 45222000000 45222 false false false 2 false true false false 37959000000 37959 false false false Total of all Stockholders' Equity (deficit) items, net of receivables from officers, directors owners, and affiliates of the entity which is directly or indirectly attributable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 27 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 20 -Article 7 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 26 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 38 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph A3 -Appendix A false 64 Total equity 5 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest us-gaap true credit instant monetary No definition available. false false false false false false false false false false false totallabel false 1 false true false false 671619000000 671619 false false false 2 false true false false 616243000000 616243 false false false Total of Stockholders' Equity (deficit) items, net of receivables from officers, directors owners, and affiliates of the entity including portions attributable to both the parent and noncontrolling interests (previously referred to as minority interest), if any. The entity including portions attributable to the parent and noncontrolling interests is sometimes referred to as the economic entity. This excludes temporary equity and is sometimes called permanent equity. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 25 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 26 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph A3 -Appendix A true 65 Total 4 us-gaap_LiabilitiesAndStockholdersEquity us-gaap true credit instant monetary No definition available. false false false false false false false false false false false totallabel false 1 true true false false 1409033000000 1409033 false false false 2 true true false false 1385824000000 1385824 false false false Total of all Liabilities and Stockholders' Equity items. 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