Supplemental Cash Flow Information - Additional Information (Details) - USD ($) $ in Thousands		3 Months Ended		17 Months Ended
	Oct. 31, 2019	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2021
Cash Flow Supplemental Disclosures [Line Items]
Capital expenditures		$ 179,683	$ 214,529
Non-cash transfer of 40% value of construction in progress of Kemerton plant to MRL		43,223	36,723
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		$ 43,200	$ 36,700	$ 387,300