Goodwill and Other Intangible Assets, Net - Narrative (Details)	3 Months Ended	12 Months Ended
	Dec. 31, 2020 USD ($)	Jun. 30, 2022 USD ($) reporting_unit	Jun. 30, 2021 USD ($)	Jun. 30, 2020 USD ($) facility	Jun. 01, 2022
Goodwill [Line Items]
Number of reporting units | reporting_unit		3
Goodwill		$ 241,400,000	$ 241,400,000	$ 290,400,000
Goodwill impairment	$ 52,800,000	0	52,800,000	34,600,000
Amortization expense		6,900,000	6,900,000	8,300,000
Accumulated goodwill impairment loss		(134,600,000)	(134,600,000)	(81,800,000)
Estimated annual amortization expense for 2023		6,800,000
Estimated annual amortization expense for 2024		6,600,000
Estimated annual amortization expense for 2025		6,500,000
Estimated annual amortization expense for 2026		6,500,000
Estimated annual amortization expense for 2027		4,500,000
Finite-lived intangible assets		$ 35,200,000	43,100,000
Special Alloy Operations Reporting Unit
Goodwill [Line Items]
Percentage of goodwill		81.00%
Reporting unit, percentage of fair value in excess of carrying amount		38.20%
Reporting unit, percentage of fair value in excess of carrying value if fair value reduced by one half percent		34.50%
Additive Reporting Unit | Technology Based Intangible Assets And Customer Relationships
Goodwill [Line Items]
Impairment of intangible assets			4,300,000
Facility Closing
Goodwill [Line Items]
Impairment of intangible assets				7,300,000
Finite-lived intangible assets			0	$ 0
Number of power production facilities closed | facility				2
Measurement Input, Terminal Growth Rate | Special Alloy Operations Reporting Unit
Goodwill [Line Items]
Reporting unit, long term growth rate reduction necessary to approximate net Book value		2.50%
Valuation Technique, Discounted Cash Flow | Measurement Input, Weighted Average Cost of Capital | Special Alloy Operations Reporting Unit
Goodwill [Line Items]
Goodwill, measurement input		9.50%
Valuation Technique, Discounted Cash Flow | Measurement Input, Terminal Growth Rate | Special Alloy Operations Reporting Unit
Goodwill [Line Items]
Goodwill, measurement input		0.50%
Performance Engineered Products
Goodwill [Line Items]
Number of reporting units | reporting_unit		2
Goodwill		$ 45,900,000	45,900,000	$ 94,900,000
Goodwill impairment			$ 52,800,000
Performance Engineered Products | Dynamet
Goodwill [Line Items]
Goodwill		31,900,000
Reporting unit, percentage of fair value in excess of carrying amount					54.10%
Reporting unit, percentage of fair value in excess of carrying value if fair value reduced by one half percent					52.00%
Performance Engineered Products | Latrobe Distribution
Goodwill [Line Items]
Goodwill		$ 14,000,000
Reporting unit, percentage of fair value in excess of carrying value if fair value reduced by one half percent		32.10%			34.50%
Performance Engineered Products | Measurement Input, Terminal Growth Rate | Dynamet
Goodwill [Line Items]
Reporting unit, long term growth rate reduction necessary to approximate net Book value		2.50%
Performance Engineered Products | Measurement Input, Terminal Growth Rate | Latrobe Distribution
Goodwill [Line Items]
Reporting unit, long term growth rate reduction necessary to approximate net Book value		2.50%
Performance Engineered Products | Valuation Technique, Discounted Cash Flow | Measurement Input, Weighted Average Cost of Capital | Dynamet
Goodwill [Line Items]
Goodwill, measurement input					13.00%
Performance Engineered Products | Valuation Technique, Discounted Cash Flow | Measurement Input, Weighted Average Cost of Capital | Latrobe Distribution
Goodwill [Line Items]
Goodwill, measurement input					11.00%
Performance Engineered Products | Valuation Technique, Discounted Cash Flow | Measurement Input, Terminal Growth Rate | Dynamet
Goodwill [Line Items]
Goodwill, measurement input		0.50%
Performance Engineered Products | Valuation Technique, Discounted Cash Flow | Measurement Input, Terminal Growth Rate | Latrobe Distribution
Goodwill [Line Items]
Goodwill, measurement input		0.50%