v3.26.1
Accumulated Other Comprehensive Loss - Reclassifications Out of AOCL (Details) - USD ($)
$ in Thousands
 12 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2024
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Currency exchange contracts $ (17,358) $ (13,811) $ (699)
Recognition of actuarial losses (11,590) (8,287) (5,713)
Tax impact 110,915 33,296 30,809
Reclassification out of Accumulated Other Comprehensive Income | Derivatives attributable to Kennametal      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Total before tax (736) (2,085) (960)
Net of tax (556) (1,574) (725)
Tax impact 180 511 235
Reclassification out of Accumulated Other Comprehensive Income | Pension and other postretirement benefits attributable to Kennametal      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Total before tax 11,590 8,287 5,713
Net of tax 8,680 6,257 4,227
Amortization of transition obligations 0 0 76
Amortization of prior service credit (272) (263) (258)
Recognition of actuarial losses 11,862 8,550 5,895
Tax impact (2,910) (2,030) (1,486)
Reclassification out of Accumulated Other Comprehensive Income | Forward Starting Interest Rate Swap Contracts | Derivatives attributable to Kennametal      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Forward starting interest rate swaps (1,020) (1,020) (1,020)
Reclassification out of Accumulated Other Comprehensive Income | Currency Exchange Contracts | Derivatives attributable to Kennametal      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Currency exchange contracts $ 284 $ (1,065) $ 60