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Stock-Based Compensation (Tables)

12 Months Ended

Mar. 31, 2023

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)			2023						2022						2021
Liability Awards			$	2.7					$	3.2					$	21.7
Equity Awards			15.7						9.0						18.0
Total stock-based compensation expense			$	18.4					$	12.2					$	39.7

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 2021			22,087,623
Granted			(597,927)
Balance at 31 March 2022			21,489,696
Granted			(2,540,893)
Balance at 31 March 2023			18,948,803

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
Options exercisable at 31 March 2023						—						—

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 2021			593,486						726,288						1,286,922						2,606,696						19.01
Granted			233,443						141,015						223,469						597,927						41.73
Vested			(313,641)						(248,202)						(565,878)						(1,127,721)						14.96
Forfeited			(98,613)						(327,397)						(450,480)						(876,490)						27.73
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

Assumptions Used for Restricted Stock Grants

The following table includes the assumptions used for RSU grants (market condition) valued:

Vesting Condition:			Market						Market						Market						Market						Market						Market						Market						Market
			FY23						FY23						FY23						FY23						FY23						FY23						FY22						FY22
Date of grant			31-Aug-22						31-Aug-22						3-Nov-22						3-Nov-22						3-Nov-22						13-Mar-23						27-Aug-21						9-Sep-21
Dividend yield (per annum)			1.5		%				1.5		%				—		%				—		%				—		%				—		%				2.0		%				2.0		%
Expected volatility			41.9		%				33.4		%				42.5		%				35.1		%				43.8		%				36.3		%				40.0		%				40.2		%
Risk free interest rate			3.5		%				3.5		%				4.7		%				4.7		%				4.7		%				4.0		%				0.4		%				0.4		%
Expected life in years			3.0						2.0						0.8						1.8						2.8						2.4						3.0						2.9
JHX stock price at grant date (A$)			33.51						33.51						33.05						33.05						33.05						30.98						52.66						52.12
Number of restricted stock units			387,360						102,250						38,387						39,450						115,688						41,401						130,513						92,956

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)						2023						2022						2021
Total fair value vested						$	18.4					$	42.6					$	27.8

Cash Settled Units Activity

The following represents the activity related to the CSUs:

						FY23						FY22
Granted						751,569						423,051
Vested						237,600						433,872
Cancelled						325,459						1,292,934

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