BUSINESS SEGMENTS (Tables)

12 Months Ended

Mar. 31, 2025

Segment Reporting [Abstract]

Financial Information Related to Operations by Segment

The following tables set forth certain financial information relating to our operations by segment. We do not allocate interest or taxes at the segment level, only at the consolidated company level.

Year Ended March 31, 2025 (dollars in thousands)	Cement		Concrete and Aggregates		Gypsum Wallboard		Recycled Paperboard		Total
Revenue from External Customers	$	1,053,620	$	237,723	$	846,499	$	122,666	$	2,260,508
Intersegment Revenue		36,799		13,913		—		89,058		139,770
Revenue from Joint Venture		110,943		—		—		—		110,943
		1,201,362		251,636		846,499		211,724		2,511,221
Reconciliation of Revenue
Intersegment Revenue										(139,770)
Revenue from Joint Venture										(110,943)
Total Consolidated Revenue									$	2,260,508
Less:
Freight and Delivery	$	90,996	$	32,593	$	146,000	$	96	$	269,685
Parts, Supplies, and Services (Includes Maintenance)		231,530		39,109		19,032		12,598		302,269
Energy		140,754		7,562		33,978		14,035		196,329
Raw Materials		84,669		109,587		179,142		94,769		468,167
Labor and Fixed Costs		162,741		36,722		61,968		21,431		282,862
Depreciation, Depletion, and Amortization (1)		91,817		23,247		25,807		14,782		155,653
Purchased Cement		77,059		—		—		—		77,059
Other Segment Items		2,340		11,581		29,808		15,935		59,664
Segment Profit	$	319,456	$	(8,765)	$	350,764	$	38,078	$	699,533
Reconciliation of Segment Profit and Loss
Corporate General and Administrative Expense										(73,942)
Other Non-Operating Income										6,420
Interest Expense										(40,526)
Earnings Before Income Taxes									$	591,485

Year Ended March 31, 2024 (dollars in thousands)	Cement		Concrete and Aggregates		Gypsum Wallboard		Recycled Paperboard		Total
Revenue from External Customers	$	1,077,918	$	240,012	$	839,530	$	101,837	$	2,259,297
Intersegment Revenue		35,363		12,940		—		82,351		130,654
Revenue from Joint Venture		112,736		—		—		—		112,736
		1,226,017		252,952		839,530		184,188		2,502,687
Reconciliation of Revenue
Intersegment Revenue										(130,654)
Revenue from Joint Venture										(112,736)
Total Consolidated Revenue									$	2,259,297
Less:
Freight and Delivery	$	94,031	$	33,976	$	149,441	$	623	$	278,071
Parts, Supplies, and Services (Includes Maintenance)		217,393		31,246		22,337		11,186		282,162
Energy		154,925		7,641		37,984		17,120		217,670
Raw Materials		87,154		112,447		178,340		83,784		461,725
Labor and Fixed Costs		155,118		31,014		59,796		22,875		268,803
Depreciation, Depletion, and Amortization (1)		89,138		19,728		23,038		14,811		146,715
Purchased Cement		86,219		—		—		—		86,219
Other Segment Items		3,690		4,499		34,058		2,173		44,420
Segment Profit	$	338,349	$	12,401	$	334,536	$	31,616	$	716,902
Reconciliation of Segment Profit and Loss
Corporate General and Administrative Expense										(59,795)
Other Non-Operating Income										3,087
Interest Expense										(42,257)
Earnings Before Income Taxes									$	617,937

Year Ended March 31, 2023 (dollars in thousands)	Cement		Concrete and Aggregates		Gypsum Wallboard		Recycled Paperboard		Total
Revenue from External Customers	$	927,637	$	239,516	$	872,471	$	108,445	$	2,148,069
Intersegment Revenue		32,915		—		—		92,835		125,750
Revenue from Joint Venture		113,518		—		—		—		113,518
		1,074,070		239,516		872,471		201,280		2,387,337
Reconciliation of Revenue
Intersegment Revenue										(125,750)
Revenue from Joint Venture										(113,518)
Total Consolidated Revenue									$	2,148,069
Less:
Freight and Delivery	$	97,126	$	36,115	$	160,536	$	8,760	$	302,537
Parts, Supplies, and Services (Includes Maintenance)		183,706		17,724		17,933		10,609		229,972
Energy		149,445		5,236		50,177		19,914		224,772
Raw Materials		75,617		112,269		184,677		95,060		467,623
Labor and Fixed Costs		141,719		19,511		54,041		20,761		236,032
Depreciation, Depletion, and Amortization (1)		81,643		17,413		21,744		14,942		135,742
Purchased Cement		47,454		—		—		—		47,454
Other Segment Items		18,598		12,989		30,864		6,014		68,465
Segment Profit	$	278,762	$	18,259	$	352,499	$	25,220	$	674,740
Reconciliation of Segment Profit and Loss
Corporate General and Administrative Expense										(53,630)
Other Non-Operating Income										2,654
Interest Expense										(35,171)
Earnings Before Income Taxes									$	588,593

(1) Depreciation, Depletion, and Amortization for corporate assets was $3,249 million, $3,117 million, and $2,812 million, in fiscal 2025, 2024, and 2023, respectively. These amounts are included in Corporate General and Administrative Expense.

Additional information about our segments is included below:

	For the Years Ended March 31,
	2025		2024		2023
		(dollars in thousands)
Capital Expenditures
Cement	$	139,965	$	65,442	$	39,049
Concrete and Aggregates		20,571		15,103		35,503
Gypsum Wallboard		15,843		29,127		31,063
Recycled Paperboard		15,193		10,085		2,898
Corporate and Other		3,709		548		1,630
	$	195,281	$	120,305	$	110,143
Segment Assets
Cement	$	$2,172,459	$	$2,042,499	$	$1,905,227
Concrete and Aggregates		$408,792		$225,485		$234,767
Gypsum Wallboard		$429,268		$432,122		$421,425
Recycled Paperboard		$166,673		$170,832		$163,797
Corporate and Other		$87,396		$76,081		$55,786
	$	3,264,588	$	2,947,019	$	2,781,002
Cement Operating Earnings
Wholly Owned		293,060		306,768		243,288
Joint Venture		26,396		31,581		35,474
	$	319,456	$	338,349	$	278,762
Cement Sales Volume (M tons)
Wholly Owned		6,237		6,610		6,399
Joint Venture		675		679		734
		6,912		7,289		7,133

Segment Breakdown of Goodwill

The segment breakdown of Goodwill at March 31, 2025, and 2024 is as follows:

	For the Years Ended March 31,
	2025		2024
	(dollars in thousands)
Cement	$	227,639	$	227,639
Concrete and Aggregates		118,099		40,774
Gypsum Wallboard		116,618		116,618
Recycled Paperboard		7,538		7,538
	$	469,894	$	392,569

Summarized Financial Information for Joint Venture Unconsolidated

Summarized financial information for the Joint Venture that is not consolidated is set out below. The summarized financial information includes the total amount of the Joint Venture and not our 50% interest in those amounts:

	For the Years Ended March 31,
	2025		2024
	(dollars in thousands)
Revenue	$	221,937	$	225,503
Gross Margin	$	60,789	$	71,077
Earnings Before Income Taxes	$	53,217	$	63,644

	As of March 31,
	2025		2024
	(dollars in thousands)
Current Assets	$	128,384	$	111,164
Noncurrent Assets	$	207,910	$	158,618
Current Liabilities	$	25,618	$	27,994
Noncurrent Liabilities	$	30,152	$	14,974