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Supplemental Cash Flow Information - Additional Information (Details) - USD ($) $ in Thousands		9 Months Ended		17 Months Ended
	Oct. 31, 2019	Sep. 30, 2021	Sep. 30, 2020	Mar. 31, 2021
Cash Flow Supplemental Disclosures [Line Items]
Capital expenditures		$ 652,739	$ 621,371
Non-cash transfer of 40% value of construction in progress of Kemerton plant to MRL		135,928	131,929
Reclassification of one-time transition tax		28,700	30,400
Mineral Resources Limited Wodgina Project
Cash Flow Supplemental Disclosures [Line Items]
Ownership percentage	60.00%
Lithium Hydroxide Conversion Assets
Cash Flow Supplemental Disclosures [Line Items]
Ownership percentage	40.00%
Lithium Hydroxide Conversion Assets | Mineral Resources Limited Wodgina Project
Cash Flow Supplemental Disclosures [Line Items]
Non-cash transfer of 40% value of construction in progress of Kemerton plant to MRL		$ 135,900	$ 131,900	$ 480,000

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Cash Flow Supplemental Disclosures [Line Items]

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The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 13
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3213-108585

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