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Business Segments - Financial Information Related to Operations by Segment (Detail)
$ in Thousands
 12 Months Ended
Mar. 31, 2023
USD ($)
kt
Mar. 31, 2022
USD ($)
kt
Mar. 31, 2021
USD ($)
kt
Segment Reporting Information [Line Items]      
Revenue $ 2,148,069 $ 1,861,522 $ 1,622,642
Less: Joint Venture Revenue (113,518) (103,899) (105,191)
Operating Earnings 674,740 552,102 445,796
Corporate General and Administrative Expense (53,630) (46,801) (49,511)
Loss on Early Retirement of Senior Notes 0 (8,407) 0
Gain on Sale of Businesses 0 0 51,973
Other Nonoperating Income (Loss) 2,654 9,073 20,274
Earnings Before Interest and Income Taxes 623,764 505,967 468,532
Interest Expense, net (35,171) (30,873) (44,420)
Earnings from Continuing Operations Before Income Taxes 588,593 475,094 424,112
Capital Expenditures 110,143 74,121 53,933
Depreciation, Depletion, and Amortization 138,554 128,811 129,087
Capital Expenditures 110,143 74,121 53,933
Capital Expenditures 0 0 0
Depreciation and Amortization 0 0 221
Segment Assets 2,781,002 2,579,652 2,838,681
Operating Segments [Member]      
Segment Reporting Information [Line Items]      
Revenue 2,387,337 2,070,422 1,815,901
Depreciation, Depletion, and Amortization 138,554 128,811 128,866
Intersegment Eliminations [Member]      
Segment Reporting Information [Line Items]      
Revenue 125,750 105,001 88,068
Revenue 125,750 105,001 88,068
Cement [Member] | Operating Segments [Member]      
Segment Reporting Information [Line Items]      
Revenue $ 1,074,070 $ 1,007,094 $ 944,556
Cement Sales Volume | kt 7,133 7,534 7,466
Operating Earnings $ 278,762 $ 259,556 $ 233,957
Capital Expenditures 39,049 31,535 26,708
Depreciation, Depletion, and Amortization 81,643 79,560 77,524
Capital Expenditures 39,049 31,535 26,708
Segment Assets $ 1,905,227 $ 1,860,649 $ 1,898,930
Cement [Member] | Operating Segments [Member] | Wholly-Owned [Member]      
Segment Reporting Information [Line Items]      
Cement Sales Volume | kt 6,399 6,711 6,576
Operating Earnings $ 243,288 $ 227,068 $ 196,516
Cement [Member] | Operating Segments [Member] | Joint Venture [Member]      
Segment Reporting Information [Line Items]      
Cement Sales Volume | kt 734 823 890
Operating Earnings $ 35,474 $ 32,488 $ 37,441
Cement [Member] | Intersegment Eliminations [Member]      
Segment Reporting Information [Line Items]      
Revenue 32,915 22,915 20,862
Concrete and Aggregates [Member] | Operating Segments [Member]      
Segment Reporting Information [Line Items]      
Revenue 239,516 177,122 168,829
Operating Earnings 18,259 18,467 19,054
Capital Expenditures 35,503 5,239 3,114
Depreciation, Depletion, and Amortization 17,413 9,656 10,807
Capital Expenditures 35,503 5,239 3,114
Segment Assets 234,767 89,405 88,410
Concrete and Aggregates [Member] | Intersegment Eliminations [Member]      
Segment Reporting Information [Line Items]      
Revenue 0 0 106
Gypsum Wallboard [Member] | Operating Segments [Member]      
Segment Reporting Information [Line Items]      
Revenue 872,471 692,152 539,009
Operating Earnings 352,499 261,476 167,336
Capital Expenditures 31,063 32,405 12,889
Depreciation, Depletion, and Amortization 21,744 22,024 21,646
Capital Expenditures 31,063 32,405 12,889
Segment Assets 421,425 397,486 366,352
Paperboard [Member] | Operating Segments [Member]      
Segment Reporting Information [Line Items]      
Revenue 201,280 194,054 163,507
Operating Earnings 25,220 12,603 25,449
Capital Expenditures 2,898 2,579 11,222
Depreciation, Depletion, and Amortization 14,942 14,721 13,913
Capital Expenditures 2,898 2,579 11,222
Segment Assets 163,797 180,025 186,156
Paperboard [Member] | Intersegment Eliminations [Member]      
Segment Reporting Information [Line Items]      
Revenue 92,835 82,086 67,100
Corporate and Other [Member]      
Segment Reporting Information [Line Items]      
Depreciation, Depletion, and Amortization 2,812 2,850 4,976
Segment Assets 55,786 52,087 298,833
Corporate and Other [Member] | Operating Segments [Member]      
Segment Reporting Information [Line Items]      
Capital Expenditures 1,630 2,363 0
Capital Expenditures $ 1,630 $ 2,363 $ 0