Supplemental Cash Flow Information - Additional Information (Details) - USD ($) $ in Thousands		6 Months Ended		17 Months Ended
	Oct. 31, 2019	Jun. 30, 2021	Jun. 30, 2020	Mar. 31, 2021
Cash Flow Supplemental Disclosures [Line Items]
Capital expenditures		$ 396,915	$ 418,991
Non-cash transfer of 40% value of construction in progress of Kemerton plant to MRL		96,185	87,750
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]
Consideration transferred		480,000
Non-cash transfer of 40% value of construction in progress of Kemerton plant to MRL		$ 96,200	$ 87,800	$ 440,300