Trading Arrangements, by Individual Trading Arrangements, by Individual [Table] Trading Arrangement: Trading Arrangement [Axis] Maximum Maximum [Member] Amortization of prior service credit Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, before Tax Statistical Measurement [Domain] Statistical Measurement [Domain] Net increase in notes payable Proceeds from (Repayments of) Notes Payable Title of 12(b) Security Title of 12(b) Security Document Fiscal Year Focus Document Fiscal Year Focus Other restructuring costs Other Restructuring Costs Total derivatives Derivative Assets (Liabilities), at Fair Value, Net Preferred stock, par value (in dollars per share) Preferred Stock, No Par Value Adjustment to Compensation, Amount Adjustment to Compensation Amount Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] Customer [Axis] Customer [Axis] Segment Reporting [Abstract] Segment Reporting [Abstract] Capital stock, $1.25 par value; 120,000 shares authorized; 76,839 and 76,213 shares issued, respectively Common Stock, Value, Issued Trademarks Trademarks [Member] PENSION AND OTHER POSTRETIREMENT BENEFITS Retirement Benefits [Text Block] Line of Credit Line of Credit [Member] Restatement Determination Date Restatement Determination Date Expected return on plan assets Defined Benefit Plan, Expected Return (Loss) on Plan Assets Total term debt Long-Term Debt and Lease Obligation, Including Current Maturities Derivative Instrument Risk [Axis] Derivative Instrument [Axis] Derivative Instrument [Axis] Pension and other postretirement benefits attributable to noncontrolling interests Accumulated Defined Benefit Plans Adjustment Attributable to Noncontrolling Interest [Member] Accrued pension and postretirement benefits Increase (Decrease) in Obligation, Pension and Other Postretirement Benefits Amendment Flag Amendment Flag Goodwill [Line Items] Goodwill [Line Items] Current liabilities: Liabilities, Current [Abstract] Restructuring and other charges, net (Note 6) Restructuring and other charges, net Restructuring Costs and Asset Impairment Charges Entity Common Stock, Shares Outstanding (in shares) Entity Common Stock, Shares Outstanding Increase in borrowing capacity Line of Credit Facility, Borrowing Capacity, Increase (Decrease) Line of Credit Facility, Borrowing Capacity, Increase (Decrease) Revenues, percent Revenues, percent Revenues, percent Restricted Stock Units - Time Vesting Restricted Stock Units Time Vesting [Member] Restricted stock units time vesting. Other comprehensive loss, net of tax Other Comprehensive Income (Loss), Net of Tax [Abstract] Adjustment to Non-PEO NEO Compensation Footnote Adjustment to Non-PEO NEO Compensation Footnote [Text Block] Entity Address, State or Province Entity Address, State or Province PEO Total Compensation Amount PEO Total Compensation Amount Capital stock, par value (in dollars per share) Common Stock, Par or Stated Value Per Share Foreign currency translation adjustments Foreign currency translation adjustments, net of tax Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax Capital expenditures: Segment Reporting, Long-Lived Asset, Expenditure for Addition Reclassification out of Accumulated Other Comprehensive Loss Reclassification out of Accumulated Other Comprehensive Income [Member] Exchange [Domain] Exchange [Domain] Other intangible assets, less accumulated amortization of $182,795 and $181,878, respectively (Note 17) Intangible Asset, Excluding Goodwill, after Accumulated Amortization Unvested, beginning balance (in shares) Unvested, ending balance (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number Notional amount Derivative, Notional Amount Basic weighted average shares outstanding (in shares) Weighted-average shares outstanding during the period (in shares) Weighted Average Number of Shares Outstanding, Basic Accumulated impairment losses, beginning balance Accumulated impairment losses, ending balance Goodwill, Impaired, Accumulated Impairment Loss Retirement Benefits [Abstract] Retirement Benefits [Abstract] Outstanding Aggregate Erroneous Compensation Amount Outstanding Aggregate Erroneous Compensation Amount Number of reportable segments Number of Reportable Segments Total current liabilities Liabilities, Current Environmental Remediation Obligations [Abstract] Environmental Remediation Obligations [Abstract] Customer-related Customer Relationships [Member] Europe, the Middle East and Africa (EMEA) EMEA [Member] Entity Address, City or Town Entity Address, City or Town Schedule of supplemental cash flow disclosures Schedule of Cash Flow, Supplemental Disclosures [Table Text Block] Unrecognized net pension and other postretirement benefit plans (loss) gain, tax impact Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, Tax Granted (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period Changes in accounts payable related to purchases of property, plant and equipment Change in accounts payable related to purchases of property plant and equipment Change in accounts payable related to purchases of property plant and equipment Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] Defined Benefit Plan Disclosure [Line Items] Defined Benefit Plan Disclosure [Line Items] Statement of Financial Position [Abstract] Statement of Financial Position [Abstract] Gain (loss) recognized in earnings was due to ineffectiveness Derivative Instruments, Gain (Loss) Recognized In Income Due To Ineffectiveness Derivative Instruments, Gain (Loss) Recognized In Income Due To Ineffectiveness Document Information [Line Items] Document Information [Line Items] Award Timing MNPI Disclosure Award Timing MNPI Disclosure [Text Block] Vested (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period Class of Stock [Axis] Class of Stock [Axis] Peer Group Total Shareholder Return Amount Peer Group Total Shareholder Return Amount Net of tax Net Income (Loss) Available to Common Stockholders, Basic Inventories Inventory, Net [Abstract] Dividend reinvestment Stock Issued During Period, Value, Dividend Reinvestment Plan Level 2 Fair Value, Inputs, Level 2 [Member] Accumulated amortization on other intangible assets Accumulated Amortization Intangible Asset, Finite-Lived, Accumulated Amortization Total Shareholder Return Vs Peer Group Total Shareholder Return Vs Peer Group [Text Block] Total other comprehensive loss, net of tax Other comprehensive loss Other Comprehensive Income (Loss), Net of Tax Non-Rule 10b5-1 Arrangement Terminated Non-Rule 10b5-1 Arrangement Terminated [Flag] Capital Stock, par value $1.25 per share Capital Stock, Par Value $1.25 Per Share [Member] Capital Stock, Par Value $1.25 Per Share [Member] Currency Forward Contracts Currency exchange contracts Currency Forward Contracts [Member] Currency forward contracts. Unrealized gain (loss) on derivatives designated and qualified as cash flow hedges, tax impact Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification, Tax Schedule of segment data Segment Reporting [Table Text Block] Noncontrolling Interest Non-controlling interests Noncontrolling Interest [Member] Net other comprehensive income (loss) Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Other comprehensive loss, pre-tax Other Comprehensive Income (Loss), before Tax Long-term debt Long-Term Debt Accrued income taxes Increase (Decrease) in Income Taxes Payable Document Period End Date Document Period End Date Changes in certain assets and liabilities: Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity, Increase (Decrease) in Operating Capital [Abstract] Capital stock issued under employee benefit and stock plans Stock Issued During Period, Value, Employee Benefit Plan, Net Of Adjustment Stock Issued During Period, Value, Employee Benefit Plan, Net Of Adjustment Net cash flow used in investing activities Cash Provided by (Used in) Investing Activity, Including Discontinued Operation Equity Awards Adjustments, Excluding Value Reported in Compensation Table Equity Awards Adjustments, Excluding Value Reported in the Compensation Table [Member] Debt instrument, face amount Debt Instrument, Face Amount EQUITY Equity [Text Block] Amount of hedged item Derivative, Amount of Hedged Item Security Exchange Name Security Exchange Name Fair value of derivatives Derivative, Fair Value, Net [Abstract] Reclassification out of Accumulated Other Comprehensive Loss [Domain] Reclassification out of Accumulated Other Comprehensive Income [Domain] SUPPLEMENTAL CASH FLOW DISCLOSURES Cash Flow, Supplemental Disclosures [Text Block] Less: LIFO valuation Inventory, LIFO Reserve SUPPLIER FINANCE PROGRAM Supplier Finance Program [Text Block] Total liabilities at fair value Liabilities, Fair Value Disclosure Accumulated other comprehensive loss Accumulated Other Comprehensive Income (Loss), Net of Tax Entity Shell Company Entity Shell Company Current operating lease liabilities Operating Lease, Liability, Current Statement of Comprehensive Income [Abstract] Statement of Comprehensive Income [Abstract] EARNINGS PER SHARE Earnings Per Share [Text Block] Name Outstanding Recovery, Individual Name PER SHARE DATA ATTRIBUTABLE TO KENNAMETAL SHAREHOLDERS Earnings Per Share [Abstract] Earnings Per Share [Abstract] Award Timing, How MNPI Considered Award Timing, How MNPI Considered [Text Block] Document Fiscal Period Focus Document Fiscal Period Focus Peer Group Issuers, Footnote Peer Group Issuers, Footnote [Text Block] Total liabilities Liabilities Trading Symbol Trading Symbol Geographical [Domain] Geographical [Domain] Purchases of property, plant and equipment Total capital expenditures Payments to Acquire Property, Plant, and Equipment Infrastructure Infrastructure Infrastructure [Member] Infrastructure. Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year [Member] Pension Adjustments Prior Service Cost Pension Adjustments Prior Service Cost [Member] Accrued income taxes Accrued Income Taxes, Current Company Selected Measure Name Company Selected Measure Name Income Tax Disclosure [Abstract] Income Tax Disclosure [Abstract] 5.800% Senior Unsecured Notes due fiscal 2036 Five Point Eight Percent Senior Unsecured Notes Due In Two Thousand And Thirty Six [Member] Five Point Eight Percent Senior Unsecured Notes Due In Two Thousand And Thirty Six Pension and other postretirement benefits attributable to Kennametal Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] Long-term debt, gross Long-Term Debt, Gross Schedule of (gains) losses related to derivatives not designated as hedging instruments Derivatives Not Designated as Hedging Instruments [Table Text Block] Credit Facility [Domain] Credit Facility [Domain] OPERATING ACTIVITIES Cash Provided by (Used in) Operating Activity, Including Discontinued Operation [Abstract] Compensation Amount Outstanding Recovery Compensation Amount Individual: Individual [Axis] Diluted weighted average shares outstanding (in shares) Number of shares on which diluted earnings per share is calculated (in shares) Weighted Average Number of Shares Outstanding, Diluted Disaggregation of Revenue [Line Items] Disaggregation of Revenue [Line Items] Term Loan Due Fiscal 2030 Term Loan Due Fiscal 2030 [Member] Term Loan Due Fiscal 2030 Entity Emerging Growth Company Entity Emerging Growth Company Equity Valuation Assumption Difference, Footnote Equity Valuation Assumption Difference, Footnote [Text Block] Accrued pension and postretirement benefits Liability, Defined Benefit Plan, Noncurrent Line of Credit Facility [Table] Line of Credit Facility [Table] Underlying Security Market Price Change Underlying Security Market Price Change, Percent DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES Derivative Instruments and Hedging Activities Disclosure [Text Block] Asset Write-Down Restructuring Reserve, Accrual Adjustment Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-Based Compensation Arrangements by Share-Based Payment Award [Table] Derivative liabilities Derivative Liability, Subject to Master Netting Arrangement, before Offset Gross profit Gross Profit Other Increase (Decrease) in Other Operating Assets and Liabilities, Net Award Timing Predetermined Award Timing Predetermined [Flag] The effect of employee benefit and stock plans and dividend reinvestment Dividend Reinvestment and Employee Benefit and Stock Plans Dividend reinvestment and employee benefit and stock plans. Schedule of components of, and changes in accumulated other comprehensive loss Comprehensive Income (Loss) [Table Text Block] Intangible Asset, Goodwill and Other [Abstract] Intangible Asset, Goodwill and Other [Abstract] Adjustment To PEO Compensation, Footnote Adjustment To PEO Compensation, Footnote [Text Block] Level 1 Fair Value, Inputs, Level 1 [Member] Performance metric adjustments, net (in shares) Performance metric adjustments, net (in shares) Share Based Compensation Arrangement by Share Based payment Award Equity Instrument Other Than Options Expirations in Period Share Based Compensation Arrangement by Share Based payment Award Equity Instrument Other Than Options Expirations in Period Effective tax rate Effective Income Tax Rate Reconciliation, Percent 2.800% Senior Unsecured Notes due fiscal 2031 Two Point Eight Percent Senior Unsecured Notes Due In Two Thousand And Thirty One [Member] Two Point Eight Percent Senior Unsecured Notes Due In Two Thousand And Thirty One Foreign currency-denominated intercompany loan payable Derivative Asset, Notional Amount Forward starting interest rate swaps Forward Starting Interest Rate Swap Contracts [Member] Forward starting interest rate swap contracts. Add: Unexercised stock options and unvested restricted stock units (in shares) Incremental Common Shares Attributable to Dilutive Effect of Share-Based Payment Arrangements Total before tax Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest Weighted Average Fair Value, Unvested, beginning balance (in dollars per share) Weighted Average Fair Value, Unvested, ending balance (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value All Executive Categories All Executive Categories [Member] Amortization of capitalized information technology costs Increase (Decrease) In Amortization Of Prepaid Assets Increase (Decrease) In Amortization Of Prepaid Assets Pension Adjustments Service Cost Pension Adjustments Service Cost [Member] Unrecognized net pension and other postretirement benefit plans (loss) gain Unrecognized net pension and other postretirement benefit plans (loss) gain, net of tax Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, after Tax Long-term debt, fair value Long-Term Debt, Fair Value Schedule of foreign currency-denominated intercompany loans payable designated as net investment hedges Schedule of Net Investment Hedges, Statements of Financial Performance and Financial Position, Location [Table Text Block] Depreciation Depreciation Scenario [Domain] Scenario [Domain] Operating lease right-of-use assets Operating Lease, Right-of-Use Asset AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] 4.625% Senior Unsecured Notes due fiscal 2028 Four Point Six Two Five Percent Senior Unsecured Notes Due In Two Thousand And Twenty Eight [Member] Four Point Six Two Five Percent Senior Unsecured Notes Due In Two Thousand And Twenty Eight Earthworks Earthworks [Member] Earthworks [Member] Fair Value Disclosures [Abstract] Fair Value Disclosures [Abstract] Debt Disclosure [Abstract] Debt Disclosure [Abstract] Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] SEGMENT DATA Segment Reporting [Text Block] Minimum Minimum [Member] Cash dividends paid to Shareholders Payments of Ordinary Dividends, Common Stock Expiration Date Trading Arrangement Expiration Date Derivative Instruments, Gain (Loss) by Hedging Relationship [Axis] Hedging Relationship [Axis] Schedule of disaggregation of revenue Disaggregation of Revenue [Table Text Block] LIABILITIES Liabilities [Abstract] Effect of exchange rate changes on cash and cash equivalents Effect of Exchange Rate on Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation Income Statement Location [Axis] Income Statement Location [Axis] Location, Statement of Income, Balance [Axis] Non-Rule 10b5-1 Arrangement Adopted Non-Rule 10b5-1 Arrangement Adopted [Flag] Americas Americas [Member] Total equity Beginning Balance Ending Balance Equity, Including Portion Attributable to Noncontrolling Interest Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table [Member] Net periodic other postretirement benefit cost Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Aggregate Pension Adjustments Service Cost Aggregate Pension Adjustments Service Cost [Member] Capital stock, shares authorized (in shares) Common Stock, Shares Authorized Useful life related to technology-based intangible assets Intangible Asset, Finite-Lived, Useful Life Accumulated Other Comprehensive (Loss) Income [Line Items] Accumulated Other Comprehensive Income (Loss) [Line Items] Stock-Based Compensation (Textual) [Abstract] Stock-Based Compensation (Textual) [Abstract] Stock based compensation. Exercise Price Award Exercise Price Schedule of Restructuring and Related Costs [Table] Restructuring Cost [Table] INVESTING ACTIVITIES Cash Provided by (Used in) Investing Activity, Including Discontinued Operation [Abstract] Segment Reporting [Line Items] Segment Reporting [Line Items] Unrecognized compensation cost Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount Document Quarterly Report Document Quarterly Report Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested [Member] Segments [Domain] Segments [Domain] Segments [Domain] Line of Credit Facility [Axis] Lender Name [Axis] Term debt repayments Repayments of Long-Term Debt Scenario [Axis] Scenario [Axis] Less unamortized debt issuance costs Debt Issuance Costs, Net Awards Close in Time to MNPI Disclosures, Table Awards Close in Time to MNPI Disclosures [Table Text Block] Restructuring reserve Restructuring Reserve, Beginning Balance Restructuring Reserve, Ending Balance Restructuring Reserve Equity Component [Domain] Equity Component [Domain] PEO Actually Paid Compensation Amount PEO Actually Paid Compensation Amount Secured Debt Secured Debt [Member] Adoption Date Trading Arrangement Adoption Date Cash dividends to noncontrolling interests Dividend, Common Stock, Non-Controlling Interest, Cash Dividend, Common Stock, Non-Controlling Interest, Cash Cash dividends Dividends, Common Stock, Cash Interest rate, stated percentage Debt Instrument, Interest Rate, Stated Percentage Total Kennametal Shareholders’ Equity Equity, Attributable to Parent Entity Listings, Exchange [Axis] Entity Listings, Exchange [Axis] Restructuring Type [Axis] Restructuring Type [Axis] ENVIRONMENTAL MATTERS Environmental Loss Contingency Disclosure [Text Block] ASSETS Assets [Abstract] Title Trading Arrangement, Individual Title Forgone Recovery due to Disqualification of Tax Benefits, Amount Forgone Recovery due to Disqualification of Tax Benefits, Amount Accounting Policies [Abstract] Accounting Policies [Abstract] Restatement does not require Recovery Restatement Does Not Require Recovery [Text Block] Insider Trading Policies and Procedures [Line Items] Weighted Average Fair Value, Performance metric adjustments, net (in dollars per share) Share Based Compensation Arrangement By Share based Payment Award, Non-Option Equity Instruments, Forfeitures and Expirations, Weighted Average Exercise Price Share Based Compensation Arrangement By Share based Payment Award, Non-Option Equity Instruments, Forfeitures and Expirations, Weighted Average Exercise Price Other Proceeds from (Payment for) Other Financing Activity Allowance for doubtful accounts Accounts Receivable, Allowance for Credit Loss, Current Insider Trading Policies and Procedures Adopted Insider Trading Policies and Procedures Adopted [Flag] Restricted Stock Units - Performance Vesting Performance Shares [Member] Accrued income taxes Accrued Income Taxes, Noncurrent Deferred income taxes Deferred Income Tax Expense (Benefit) Operating expense Selling, General and Administrative Expense Other Comprehensive Income - Income Tax Allocated to Each Component [Abstract] Other Comprehensive Income - Income Tax Allocated to Each Component [Abstract] Other Comprehensive Income - Income Tax Allocated to Each Component [Abstract] Type of Restructuring [Domain] Type of Restructuring [Domain] COMMITMENTS AND CONTINGENCIES Commitments and Contingencies Disclosure [Text Block] Compensation Actually Paid vs. Net Income Compensation Actually Paid vs. Net Income [Text Block] Number of operating segments Number of Operating Segments Unexercised stock options with an exercise price greater than the average market price and restricted stock units not included in the computation because they were anti-dilutive (in shares) Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Restricted Stock Units (RSUs) Restricted Stock Units (RSUs) [Member] Schedule of the carrying amount of goodwill attributable to each segment Goodwill [Table Text Block] Schedule of diluted shares outstanding Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block] Gross goodwill, beginning balance Gross goodwill, ending balance Goodwill, Gross Revolving and other lines of credit and notes payable (Note 11) Short-Term Bank Loans and Notes Payable Entity Central Index Key Entity Central Index Key Percentage of inventories valued by using LIFO method Percentage of LIFO Inventory Less accumulated depreciation Property, Plant, and Equipment, Accumulated Depreciation, Depletion, and Amortization Net periodic pension income Net periodic other postretirement benefit costs Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] Additional paid-in capital Additional Paid in Capital, Common Stock All Adjustments to Compensation All Adjustments to Compensation [Member] Equity [Abstract] Equity [Abstract] Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year [Member] Restructuring and related cost, incurred cost Restructuring and Related Cost, Incurred Cost Net cash flow (used in) provided by operating activities Cash Provided by (Used in) Operating Activity, Including Discontinued Operation Land and buildings Land and Buildings Gross Land and buildings gross. Other comprehensive (loss) income before reclassifications Other Comprehensive Income (Loss), before Reclassifications, Net of Tax Kennametal Shareholders’ Equity: Equity, Attributable to Parent [Abstract] Income Statement [Abstract] Income Statement [Abstract] Document Transition Report Document Transition Report Total attributable to noncontrolling interests AOCI Attributable to Noncontrolling Interest [Member] Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Energy Energy [Member] Energy [Member] Derivatives designated as hedging instruments Designated as Hedging Instrument [Member] Deferred income taxes Deferred Income Tax Assets, Net Stock Appreciation Rights (SARs) Stock Appreciation Rights (SARs) [Member] Aerospace & Defense Aerospace And Defense [Member] Aerospace And Defense City Area Code City Area Code Accumulated other comprehensive loss Total attributable to Kennametal AOCI Attributable to Parent [Member] Net Investment Hedge Maturing May of 2027 Net Investment Hedge Maturing May of 2027 [Member] Net Investment Hedge Maturing May of 2027 Document Information [Table] Document Information [Table] All Individuals All Individuals [Member] Corporate Segment Corporate Segment [Member] Name Forgone Recovery, Individual Name Unrecognized compensation costs, weighted average period Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition Non-GAAP Measure Description Non-GAAP Measure Description [Text Block] Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract] Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract] Statement [Line Items] Statement [Line Items] Total assets Segment assets Assets Schedule of Defined Benefit Plans Disclosures [Table] Defined Benefit Plan [Table] Reserves for environmental costs Accrual for Environmental Loss Contingencies Reclassification of net pension and other postretirement benefit plans loss Reclassification of net pension and other postretirement benefit plans loss, net of tax Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, after Tax Preferred stock, shares issued (in shares) Preferred Stock, Shares Issued Amortization of prior service credit Amortization of prior service credit Defined Benefit Plan, Amortization of Prior Service Cost (Credit) Schedule of changes in time vesting and performance vesting restricted stock units Share-Based Payment Arrangement, Outstanding Award, Activity, Excluding Option [Table Text Block] Interest expense Interest Expense, Nonoperating Accrued environmental loss contingencies, current Accrued Environmental Loss Contingencies, Current STOCK-BASED COMPENSATION Share-Based Payment Arrangement [Text Block] PEO PEO [Member] New York Stock Exchange NEW YORK STOCK EXCHANGE, INC. [Member] Preferred Stock Purchase Rights Preferred Stock Purchase Rights [Member] Preferred Stock Purchase Rights [Member] Compensation expense related to time vesting and performance vesting restricted stock units Share-Based Payment Arrangement, Expense Other liabilities Other Liabilities, Noncurrent Range Forward Contracts Range Forward Contracts [Member] Range forward contracts. Goodwill (Note 17) Goodwill, beginning balance Goodwill, ending balance Goodwill Impairment of Property Impairment of Property [Member] Impairment of Property Retirement Plan Type [Axis] Retirement Plan Type [Axis] Forgone Recovery due to Violation of Home Country Law, Amount Forgone Recovery due to Violation of Home Country Law, Amount Weighted Average Fair Value, Granted (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value Payables and Accruals [Abstract] Retained earnings Retained Earnings [Member] Gain (loss) recognized in income, ineffective portion and amount excluded from effectiveness testing Derivative Instruments, Gain (Loss) Recognized in Income, Ineffective Portion and Amount Excluded from Effectiveness Testing Derivative Instruments, Gain (Loss) Recognized in Income, Ineffective Portion and Amount Excluded from Effectiveness Testing Operating lease liabilities Operating Lease, Liability, Noncurrent Operating expense Operating Expenses Restatement [Domain] Revision of Prior Period [Domain] Weighted Average Fair Value, Forfeited (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value Erroneously Awarded Compensation Recovery Erroneously Awarded Compensation Recovery [Table] Award Timing Disclosures [Line Items] Disaggregation of Revenue [Abstract] Disaggregation of Revenue [Abstract] Currency translation adjustment attributable to Kennametal Accumulated Foreign Currency Adjustment Attributable to Parent [Member] Diluted earnings per share (in dollars per share) Earnings Per Share, Diluted Accumulated Other Comprehensive (Loss) Income [Table] Accumulated Other Comprehensive Income (Loss) [Table] Entity Current Reporting Status Entity Current Reporting Status Net cash flow provided by (used in) financing activities Cash Provided by (Used in) Financing Activity, Including Discontinued Operation Restructuring Charges [Abstract] Restructuring Charges [Abstract] Total Shareholder Return Amount Total Shareholder Return Amount Twenty Eighteen Credit Agreement 2018 Credit Agreement Twenty Eighteen Credit Agreement [Member] Twenty eighteen credit agreement. Other assets: Other Assets, Noncurrent [Abstract] Amortization of intangibles Amortization of intangible assets Intangible Asset, Finite-Lived, Amortization Expense Line of Credit Facility [Line Items] Line of Credit Facility [Line Items] Intangible Asset, Finite-Lived [Line Items] Intangible Asset, Finite-Lived [Line Items] Currency translation adjustment attributable to noncontrolling interests Accumulated Foreign Currency Adjustment Attributable to Noncontrolling Interest [Member] Share-based Payment Arrangement [Abstract] Share-Based Payment Arrangement [Abstract] FINANCING ACTIVITIES Cash Provided by (Used in) Financing Activity, Including Discontinued Operation [Abstract] Property, plant and equipment, net Property, Plant, and Equipment, after Accumulated Depreciation, Depletion, and Amortization Line of credit facility, remaining borrowing capacity Line of Credit Facility, Remaining Borrowing Capacity Schedule of changes in the carrying amounts of total equity, shareholders' equity and equity attributable to noncontrolling interests Schedule of Stockholders Equity [Table Text Block] Interest cost Defined Benefit Plan, Interest Cost Schedule of restructuring reserve by type of cost Schedule of Restructuring Reserve by Type of Cost [Table Text Block] Assets derivatives Derivative Asset INVENTORIES Inventory Disclosure [Text Block] Purchase of capital stock Stock Repurchased During Period, Value Schedule of cash flow hedges Schedule of Cash Hedges [Table Text Block] Schedule of Cash Hedges Intangible Asset, Finite-Lived, Class [Axis] Intangible Asset, Finite-Lived, Class [Axis] Equity Awards Adjustments, Footnote Equity Awards Adjustments, Footnote [Text Block] GOODWILL AND OTHER INTANGIBLE ASSETS Intangible Asset and Goodwill [Text Block] Underlying Securities Award Underlying Securities Amount Less: comprehensive income attributable to noncontrolling interests Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest Gross Carrying Amount Intangible Asset, Excluding Goodwill, before Accumulated Amortization Net Investment Hedge Maturing August of 2027 Net Investment Hedge Maturing August of 2027 [Member] Net Investment Hedge Maturing August of 2027 Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table] Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table] Equity Investment Impairment Equity Investment Impairment [Member] Equity Investment Impairment Other Payment for (Proceeds from) Other Investing Activity Inventories Increase (Decrease) in Inventories Loss (gain) recognized in other income, net Gain (loss) on derivative used in net investment hedge, after tax Gain (Loss) on Derivative Used in Net Investment Hedge, after Tax Segment Reporting [Table] Segment Reporting [Table] Other current assets Other Assets, Current Commitments and Contingencies Disclosure [Abstract] All Trading Arrangements All Trading Arrangements [Member] Other Performance Measure, Amount Other Performance Measure, Amount Award Timing MNPI Considered Award Timing MNPI Considered [Flag] Reclassification of unrealized gain on derivatives designated and qualified as cash flow hedges, tax impact Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, Tax Operating income Total operating income Operating Income (Loss) Asia Pacific Asia Pacific [Member] Current Fiscal Year End Date Current Fiscal Year End Date Non-PEO NEO Average Total Compensation Amount Non-PEO NEO Average Total Compensation Amount Restructuring Reserve [Roll Forward] Restructuring Reserve [Roll Forward] Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year [Member] Dividends per share (in dollars per share) Common Stock, Dividends, Per Share, Declared Entity File Number Entity File Number Rule 10b5-1 Arrangement Adopted Rule 10b5-1 Arrangement Adopted [Flag] Service cost Defined Benefit Plan, Service Cost Machinery and equipment Machinery and Equipment, Gross Reclassification of unrealized gain on derivatives designated and qualified as cash flow hedges, pre-tax Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax Recovery of Erroneously Awarded Compensation Disclosure [Line Items] Capital stock, shares issued (in shares) Common Stock, Shares, Issued Measure: Measure [Axis] Finished goods Inventory, Finished Goods, Gross Cost of goods sold Cost of Goods and Service, Excluding Depreciation, Depletion, and Amortization ACCUMULATED OTHER COMPREHENSIVE LOSS Comprehensive Income (Loss) Note [Text Block] Equity Components [Axis] Equity Components [Axis] Equity Components [Axis] Debt instrument, repurchase amount Debt Instrument, Repurchase Amount Accounts receivable Increase (Decrease) in Accounts Receivable Product and Service [Domain] Product and Service [Domain] Income taxes Income Tax Paid, after Refund Received Disaggregation of Revenue [Table] Disaggregation of Revenue [Table] Schedule of income tax allocated to each component of other comprehensive income Income Tax Allocated to Each Component of Other Comprehensive Income [Table Text Block] Income Tax Allocated to Each Component of Other Comprehensive Income [Table Text Block] Entity Interactive Data Current Entity Interactive Data Current Less: Net income attributable to noncontrolling interests Net Income (Loss) Attributable to Noncontrolling Interest Deferred income taxes Deferred Income Tax Liabilities, Net Compensation Actually Paid vs. Other Measure Compensation Actually Paid vs. Other Measure [Text Block] Entity Small Business Entity Small Business Reclassification Adjustment out of Accumulated Other Comprehensive Loss [Line Items] Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] Comprehensive income attributable to Kennametal Shareholders Comprehensive Income (Loss), Net of Tax, Attributable to Parent Unamortized discount Debt Instrument, Unamortized Discount Termination Date Trading Arrangement Termination Date Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Table] Fair Value, Recurring and Nonrecurring [Table] Compensation Actually Paid vs. Total Shareholder Return Compensation Actually Paid vs. Total Shareholder Return [Text Block] Forward starting interest rate swaps Interest Income (Expense), Operating MNPI Disclosure Timed for Compensation Value MNPI Disclosure Timed for Compensation Value [Flag] Other current liabilities Other Liabilities, Current Other Other Assets, Noncurrent Line of Credit Facility, Lender [Domain] Line of Credit Facility, Lender [Domain] Document Type Document Type Foreign currency translation adjustments, tax impact Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis 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