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Stock-Based Compensation (Tables)

12 Months Ended

Mar. 31, 2024

Share-Based Payment Arrangement [Abstract]

Schedule of Stock-Based Compensation Expense

Total stock-based compensation expense consists of the following:

			Years Ended 31 March
(Millions of US dollars)			2024						2023						2022
Liability Awards			$	17.3					$	2.7					$	3.2
Equity Awards			28.2						15.7						9.0
Total stock-based compensation expense			$	45.5					$	18.4					$	12.2

Summary of Stock Options Available for Grant

The following table summarizes the Company’s shares available for grant as options, RSUs or other equity instruments under the LTIP and 2001 Plan:

			Shares Available for Grant
Balance at 31 March 2022			21,489,696
Granted			(2,540,893)
Balance at 31 March 2023			18,948,803
Granted			(1,169,733)
Balance at 31 March 2024			17,779,070

Schedule of Stock Options Roll Forward

The following table summarizes the Company’s stock options activity during the noted period:

						Outstanding Options
						Number of Options						Weighted Average Exercise Price (A$)
Balance at 31 March 2022						—						—
Granted						269,221						33.05
Balance at 31 March 2023						269,221						33.05
Granted						—						—
Balance at 31 March 2024						269,221						33.05
Options exercisable at 31 March 2024						—						—

Restricted Stock Unit Activity

The following table summarizes the Company’s RSU activity:

(Units)			Service Vesting (2001 Plan)						Performance Vesting (LTIP)						Market Conditions (LTIP)						Total						Weighted Average Fair Value at Grant Date (A$)
Outstanding at 31 March 2022			414,675						291,704						494,033						1,200,412						27.83
Granted			1,279,127						268,009						724,536						2,271,672						26.12
Vested			(449,458)						(87,307)						(256,787)						(793,552)						25.17
Forfeited			(107,818)						(100,377)						(91,738)						(299,933)						28.46
Outstanding at 31 March 2023			1,136,526						372,029						870,044						2,378,599						26.97
Granted			533,278						176,624						459,831						1,169,733						43.20
Vested			(373,440)						(90,452)						(42,581)						(506,473)						30.88
Forfeited			(68,712)						(13,299)						(173,643)						(255,654)						25.63
Outstanding at 31 March 2024			1,227,652						444,902						1,113,651						2,786,205						33.36

Assumptions Used to Fair Value Restricted Stock Grants

The following table includes the assumptions used to fair value the RSU grants (market condition):

Vesting Condition:			Market						Market						Market						Market						Market						Market						Market						Market
			FY24						FY24						FY23						FY23						FY23						FY23						FY23						FY23
Date of grant			1-Sep-23						1-Sep-23						13-Mar-23						3-Nov-22						3-Nov-22						3-Nov-22						31-Aug-22						31-Aug-22
Dividend yield (per annum)			—		%				—		%				—		%				—		%				—		%				—		%				1.5		%				1.5		%
Expected volatility			35.4		%				38.7		%				36.3		%				42.5		%				35.1		%				43.8		%				41.9		%				33.4		%
Risk free interest rate			4.6		%				4.9		%				4.0		%				4.7		%				4.7		%				4.7		%				3.5		%				3.5		%
Expected life in years			3.0						2.0						2.4						0.8						1.8						2.8						3.0						2.0
JHX stock price at grant date (A$)			46.72						46.72						30.98						33.05						33.05						33.05						33.51						33.51
Number of restricted stock units			451,945						7,886						41,401						38,387						39,450						115,688						387,360						102,250

Schedule of Fair Value of Restricted Stock Units Vested

The following table presents the total fair value of all of our restricted stock units vested:

						Years ended 31 March
(Millions of US dollars)						2024						2023						2022
Total fair value vested						$	16.1					$	18.4					$	42.6

Cash Settled Units Activity

The following represents the activity related to the CSUs:

						FY24						FY23
Granted						529,875						751,569
Vested						177,955						237,600
Cancelled						125,144						325,459

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