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Goodwill and Other Intangible Assets, Net - Narrative (Details)
12 Months Ended
Jun. 30, 2020
USD ($)
reporting_unit
facility
Jun. 30, 2019
USD ($)
Jun. 30, 2018
USD ($)
Goodwill [Line Items]      
Number of reporting units | reporting_unit 5    
Goodwill impairment $ 34,600,000 $ 0 $ 0
Goodwill 290,400,000 326,400,000 268,700,000
Amortization expense 8,300,000 7,300,000 6,800,000
Estimated annual amortization expense for 2020 6,800,000    
Estimated annual amortization expense for 2021 6,800,000    
Estimated annual amortization expense for 2022 6,800,000    
Estimated annual amortization expense for 2023 6,800,000    
Estimated annual amortization expense for 2024 6,800,000    
Impairment of intangible assets 7,300,000    
Finite-lived intangible assets 52,100,000 67,200,000  
Additive Reporting Unit      
Goodwill [Line Items]      
Goodwill impairment $ 34,600,000    
Reporting unit, percentage of fair value in excess of carrying amount 24.10%    
Goodwill $ 45,600,000    
Amount of fair value in excess of carrying amount with hypothetical 5% reduction $ 5,400,000    
Special Alloy Operations Reporting Unit      
Goodwill [Line Items]      
Percentage of goodwill 67.00%    
Reporting unit, percentage of fair value in excess of carrying amount 4.50%    
Goodwill $ 195,500,000    
Reporting unit, fair value reduction necessary to approximate net book value 5.00%    
Facility Closing      
Goodwill [Line Items]      
Number of power production facilities closed | facility 2    
Impairment of intangible assets $ 7,300,000    
Finite-lived intangible assets $ 0    
Valuation Technique, Discounted Cash Flow | Measurement Input, Weighted Average Cost of Capital | Additive Reporting Unit      
Goodwill [Line Items]      
Goodwill, measurement input 17.00%    
Valuation Technique, Discounted Cash Flow | Measurement Input, Weighted Average Cost of Capital | Special Alloy Operations Reporting Unit      
Goodwill [Line Items]      
Goodwill, measurement input 10.50%    
Valuation Technique, Discounted Cash Flow | Measurement Input, Terminal Growth Rate | Additive Reporting Unit      
Goodwill [Line Items]      
Goodwill, measurement input 3.00%    
Valuation Technique, Discounted Cash Flow | Measurement Input, Terminal Growth Rate | Special Alloy Operations Reporting Unit      
Goodwill [Line Items]      
Goodwill, measurement input 3.00%    
Performance Engineered Products      
Goodwill [Line Items]      
Number of reporting units | reporting_unit 4    
Goodwill impairment $ 34,600,000    
Goodwill $ 94,900,000 $ 130,900,000 $ 73,200,000