v3.26.1
Goodwill and Other Intangible Assets, Net - Narrative (Details)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2024
USD ($)
Jun. 30, 2026
USD ($)
reportingUnit
Jun. 30, 2025
USD ($)
Jun. 30, 2024
USD ($)
Jun. 01, 2024
Goodwill [Line Items]          
Number of reporting units | reportingUnit   2      
Goodwill   $ 227.3 $ 227.3 $ 227.3  
Goodwill impairment charge $ 14.1 0.0 0.0 14.1  
Accumulated impairment losses   148.7 148.7 148.7  
Amortization expense   5.6 5.7 6.5  
Estimated annual amortization expense for 2027   3.9      
Estimated annual amortization expense for 2028   0.0      
Estimated annual amortization expense for 2029   0.0      
Estimated annual amortization expense for 2030   0.0      
Estimated annual amortization expense for 2031   $ 0.0      
Impairment of intangible assets       $ 7.0  
Impairment Of Intangible Asset Finite Lived, Statement Of Income Or Comprehensive Income Extensible Enumeration Not Disclosed Flag       true  
Special Alloy Operations Reporting Unit          
Goodwill [Line Items]          
Percentage of goodwill   86.00%      
Reporting unit, percentage of fair value in excess of carrying amount         203.00%
Reporting unit, percentage of fair value in excess of carrying value if fair value reduced by one half percent         196.00%
Special Alloy Operations Reporting Unit | Measurement Input, Weighted Average Cost of Capital | Valuation Technique, Discounted Cash Flow          
Goodwill [Line Items]          
Goodwill, measurement input         9.50%
Special Alloy Operations Reporting Unit | Measurement Input, Terminal Growth Rate          
Goodwill [Line Items]          
Reporting unit, long term growth rate reduction necessary to approximate net Book value         2.50%
Special Alloy Operations Reporting Unit | Measurement Input, Terminal Growth Rate | Valuation Technique, Discounted Cash Flow          
Goodwill [Line Items]          
Goodwill, measurement input         0.50%
Specialty Alloys Operations          
Goodwill [Line Items]          
Goodwill   $ 195.5 195.5 $ 195.5  
Performance Engineered Products          
Goodwill [Line Items]          
Goodwill   31.8 $ 31.8 $ 31.8  
Performance Engineered Products | Dynamet          
Goodwill [Line Items]          
Goodwill   $ 31.8      
Reporting unit, percentage of fair value in excess of carrying amount         144.00%
Reporting unit, percentage of fair value in excess of carrying value if fair value reduced by one half percent         140.00%
Performance Engineered Products | Dynamet | Measurement Input, Weighted Average Cost of Capital | Valuation Technique, Discounted Cash Flow          
Goodwill [Line Items]          
Goodwill, measurement input         11.00%
Performance Engineered Products | Dynamet | Measurement Input, Terminal Growth Rate          
Goodwill [Line Items]          
Reporting unit, long term growth rate reduction necessary to approximate net Book value         2.50%
Performance Engineered Products | Dynamet | Measurement Input, Terminal Growth Rate | Valuation Technique, Discounted Cash Flow          
Goodwill [Line Items]          
Goodwill, measurement input         0.50%