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Financial Information Related to Operations by Segment (Detail)
$ in Thousands
3 Months Ended 6 Months Ended
Sep. 30, 2021
USD ($)
kt
Sep. 30, 2020
USD ($)
kt
Sep. 30, 2021
USD ($)
kt
Sep. 30, 2020
USD ($)
kt
Mar. 31, 2021
USD ($)
Segment Reporting Information [Line Items]          
Revenue $ 509,694 $ 447,684 $ 985,464 $ 874,673  
Less: Joint Venture Revenue (26,926) (27,193) (49,617) (52,493)  
Operating Earnings 163,601 133,426 298,082 243,519  
Corporate General and Administrative Expense (10,667) (11,109) (20,135) (28,898)  
Early Retirement of Senior Notes (8,407)   (8,407)    
Gain on Sale of Businesses   51,973  
Other Non-Operating Income (Loss) (944) (90) 2,734 (399)  
Earnings Before Interest and Income Taxes 143,583 122,227 272,274 266,195  
Interest Expense, net (12,268) (12,556) (19,240) (26,597)  
Earnings from Continuing Operations Before Income Taxes 131,315 109,671 253,034 239,598  
Capital Expenditures 14,842 14,685 26,777 40,676  
Depreciation, Depletion and Amortization     64,284 64,199  
Depreciation and Amortization 0 100 0 221  
Identifiable Assets 2,619,828   2,619,828   $ 2,838,681
Operating Segments [Member]          
Segment Reporting Information [Line Items]          
Revenue 561,857 501,643 1,086,400 974,138  
Depreciation, Depletion and Amortization 32,340 32,162 64,284 63,978  
Intersegment Eliminations [Member]          
Segment Reporting Information [Line Items]          
Revenue 25,237 26,766 51,319 46,972  
Revenue 25,237 26,766 51,319 46,972  
Cement [Member] | Operating Segments [Member]          
Segment Reporting Information [Line Items]          
Revenue $ 288,324 $ 278,062 $ 558,579 $ 539,473  
Cement Sales Volume | kt 2,198 2,180 4,234 4,265  
Operating Earnings $ 88,750 $ 79,913 $ 151,297 $ 140,368  
Capital Expenditures 6,976 7,909 14,943 18,257  
Depreciation, Depletion and Amortization 20,019 $ 19,258 39,550 $ 38,501  
Identifiable Assets $ 1,889,037   $ 1,889,037   1,898,930
Cement [Member] | Operating Segments [Member] | Wholly-Owned [Member]          
Segment Reporting Information [Line Items]          
Cement Sales Volume | kt 1,983 1,947 3,835 3,813  
Operating Earnings $ 80,490 $ 69,336 $ 135,067 $ 121,995  
Cement [Member] | Operating Segments [Member] | Joint Venture [Member]          
Segment Reporting Information [Line Items]          
Cement Sales Volume | kt 215 233 399 452  
Operating Earnings $ 8,260 $ 10,577 $ 16,230 $ 18,373  
Cement [Member] | Intersegment Eliminations [Member]          
Segment Reporting Information [Line Items]          
Revenue (5,223) 6,267 (13,056) (12,298)  
Concrete and Aggregates [Member] | Operating Segments [Member]          
Segment Reporting Information [Line Items]          
Revenue 52,750 46,300 97,504 90,490  
Operating Earnings 7,539 5,255 12,883 10,673  
Capital Expenditures 527 41 1,073 1,302  
Depreciation, Depletion and Amortization 2,470 2,698 5,048 5,419  
Identifiable Assets 93,550   93,550   88,410
Concrete and Aggregates [Member] | Intersegment Eliminations [Member]          
Segment Reporting Information [Line Items]          
Revenue       (106)  
Gypsum Wallboard [Member] | Operating Segments [Member]          
Segment Reporting Information [Line Items]          
Revenue 172,985 131,210 339,252 261,360  
Operating Earnings 66,331 37,606 129,584 78,931  
Capital Expenditures 6,345 4,070 8,039 10,582  
Depreciation, Depletion and Amortization 5,484 5,661 10,880 10,861  
Identifiable Assets 366,276   366,276   366,352
Paperboard [Member] | Operating Segments [Member]          
Segment Reporting Information [Line Items]          
Revenue 47,798 46,071 91,065 82,815  
Operating Earnings 981 10,652 4,318 13,547  
Capital Expenditures 375 2,665 1,492 10,535  
Depreciation, Depletion and Amortization 3,663 3,344 7,331 6,696  
Identifiable Assets 185,641   185,641   186,156
Paperboard [Member] | Intersegment Eliminations [Member]          
Segment Reporting Information [Line Items]          
Revenue (20,014) (20,499) (38,263) (34,568)  
Corporate and Other [Member]          
Segment Reporting Information [Line Items]          
Capital Expenditures 619   1,230    
Depreciation, Depletion and Amortization 704 $ 1,201 1,475 $ 2,501  
Other, net [Member]          
Segment Reporting Information [Line Items]          
Identifiable Assets $ 85,324   $ 85,324   $ 298,833