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Accumulated Other Comprehensive Loss - Components of and Changes in Accumulated Other Comprehensive (Loss) Income (Details) - USD ($)
$ in Thousands
 3 Months Ended
Sep. 30, 2025
Sep. 30, 2024
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]    
Beginning Balance $ 1,324,648 $ 1,288,599
Ending Balance 1,325,597 1,317,963
Pension and other postretirement benefits attributable to Kennametal    
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]    
Beginning Balance (223,016) (221,308)
Other comprehensive income (loss) before reclassifications 646 (2,575)
Amounts reclassified from AOCL 2,353 2,186
Net other comprehensive income (loss) 2,999 (389)
Ending Balance (220,017) (221,697)
Currency translation adjustment attributable to Kennametal    
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]    
Beginning Balance (165,859) (216,263)
Other comprehensive income (loss) before reclassifications (2,629) 34,313
Amounts reclassified from AOCL 0 0
Net other comprehensive income (loss) (2,629) 34,313
Ending Balance (168,488) (181,950)
Derivatives attributable to noncontrolling interests    
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]    
Beginning Balance 2,182 2,983
Other comprehensive income (loss) before reclassifications (8) (84)
Amounts reclassified from AOCL (166) (222)
Net other comprehensive income (loss) (174) (306)
Ending Balance 2,008 2,677
Total attributable to Kennametal    
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]    
Beginning Balance (386,693) (434,588)
Other comprehensive income (loss) before reclassifications (1,991) 31,654
Amounts reclassified from AOCL 2,187 1,964
Net other comprehensive income (loss) 196 33,618
Ending Balance (386,497) (400,970)
Pension and other postretirement benefits attributable to noncontrolling interests    
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]    
Beginning Balance 0 0
Other comprehensive income (loss) before reclassifications 0 0
Net other comprehensive income (loss) 0 0
Ending Balance 0 0
Currency translation adjustment attributable to noncontrolling interests    
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]    
Beginning Balance (7,844) (8,680)
Other comprehensive income (loss) before reclassifications (625) 723
Net other comprehensive income (loss) (625) 723
Ending Balance (8,469) (7,957)
Derivatives attributable to noncontrolling interests    
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]    
Beginning Balance 0 0
Other comprehensive income (loss) before reclassifications 0 0
Net other comprehensive income (loss) 0 0
Ending Balance 0 0
Total attributable to noncontrolling interests    
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]    
Beginning Balance (7,844) (8,680)
Other comprehensive income (loss) before reclassifications (625) 723
Net other comprehensive income (loss) (625) 723
Ending Balance (8,469) (7,957)
Noncontrolling Interest [Member]    
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]    
Beginning Balance 40,669 38,724
Ending Balance 41,377 40,790
Reclassification out of Accumulated Other Comprehensive Loss | Pension and other postretirement benefits attributable to Kennametal    
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]    
Income (Loss) from Continuing Operations, Including Portion Attributable to Noncontrolling Interest (2,886) (2,908)
Reclassification out of Accumulated Other Comprehensive Loss | Derivatives attributable to noncontrolling interests    
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]    
Income (Loss) from Continuing Operations, Including Portion Attributable to Noncontrolling Interest $ (220) $ (297)