v3.26.3
Accumulated Other Comprehensive Loss - Reclassifications (Details) - USD ($)
$ in Thousands
 3 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Reclassification Adjustment out of Accumulated Other Comprehensive Loss [Line Items]    
Currency exchange contracts $ 11,063 $ (2,322)
Recognition of actuarial losses (2,912) (2,886)
Tax impact 82,258 9,064
Reclassification out of Accumulated Other Comprehensive Loss | Derivatives attributable to noncontrolling interests    
Reclassification Adjustment out of Accumulated Other Comprehensive Loss [Line Items]    
Total before tax (256) (220)
Tax impact 63 54
Net of tax (193) (166)
Reclassification out of Accumulated Other Comprehensive Loss | Pension and other postretirement benefits attributable to Kennametal    
Reclassification Adjustment out of Accumulated Other Comprehensive Loss [Line Items]    
Amortization of prior service credit (67) (67)
Recognition of actuarial losses 2,979 2,953
Total before tax 2,912 2,886
Tax impact (720) (533)
Net of tax 2,192 2,353
Reclassification out of Accumulated Other Comprehensive Loss | Forward starting interest rate swaps | Derivatives attributable to noncontrolling interests    
Reclassification Adjustment out of Accumulated Other Comprehensive Loss [Line Items]    
Forward starting interest rate swaps (255) (255)
Reclassification out of Accumulated Other Comprehensive Loss | Currency exchange contracts | Derivatives attributable to noncontrolling interests    
Reclassification Adjustment out of Accumulated Other Comprehensive Loss [Line Items]    
Currency exchange contracts $ (1) $ 35