For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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Segment Information, Geographic and Product Data - Narrative (Details) - segment	12 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2019
Segment Reporting Information [Line Items]
Number of reportable segments	2
Sales Revenue \| Customer \| Howmet Aerospace Inc.
Segment Reporting Information [Line Items]
Concentration risk		10.00%	11.00%
Sales Revenue \| Customer \| Howmet Aerospace Inc. \| Specialty Alloys Operations
Segment Reporting Information [Line Items]
Concentration risk		90.00%
Sales Revenue \| Customer \| Howmet Aerospace Inc. \| Performance Engineered Products
Segment Reporting Information [Line Items]
Concentration risk		10.00%