INCOME TAXES - Narrative (Details) - USD ($)	12 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Mar. 31, 2021
Operating Loss Carryforwards [Line Items]
Income resulting from tax holidays and tax incentives	$ 14,000,000	$ 23,000,000	$ 21,000,000
Effect on basic earnings per share due to income resulting from tax holidays and tax incentives (in dollars per share)	$ 0.03	$ 0.05	$ 0.04
Effect on diluted earnings per share due to income resulting from tax holidays and tax incentives (in dollars per share)	$ 0.03	$ 0.05	$ 0.04
Restructuring of Nextracker LLC interest	$ (195,000,000)	$ 0	$ 0
Increase (decrease) in valuation allowance	(12,000,000)	(26,000,000)	(25,000,000)
Valuation allowance, other offsetting amount	(48,000,000)	39,000,000	60,000,000
Tax losses and other carryforwards	1,468,000,000
Deferred tax assets related to operating losses and other carryforwards, without valuation allowance amount	62,000,000
Undistributed earnings of subsidiaries	1,900,000,000
Decrease in unrecognized tax benefit is reasonably possible	84,000,000
Unrecognized tax benefits	268,000,000	282,000,000	266,000,000
Unrecognized tax benefits affect annual effective tax rate if benefits eventually recognized	185,000,000
Interest and penalties recognized	1,000,000	2,000,000	2,000,000
Amount accrued for the payment of interest	15,000,000	16,000,000	14,000,000
Singapore
Operating Loss Carryforwards [Line Items]
Tax effect of foreign income not repatriated to Singapore	31,000,000	$ 105,000,000	$ 57,000,000
Deferred tax liability not recognized undistributed earnings of its subsidiaries	169,000,000
Deferred tax liability on undistributed foreign earnings	0
Australia And Netherlands
Operating Loss Carryforwards [Line Items]
Increase (decrease) in valuation allowance	(12,000,000)
Hungary, Canada, And Switzerland
Operating Loss Carryforwards [Line Items]
Increase (decrease) in valuation allowance	$ 12,000,000