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Inventories - Schedule of Inventories (Detail) - USD ($) $ in Thousands	Sep. 30, 2025	Mar. 31, 2025
Inventory [Line Items]
Inventories	$ 370,207	$ 415,175
Raw Materials and Material-in-Progress [Member]
Inventory [Line Items]
Inventories	141,042	164,683
Finished Cement [Member]
Inventory [Line Items]
Inventories	48,292	67,711
Aggregates [Member]
Inventory [Line Items]
Inventories	15,157	17,681
Gypsum Wallboard [Member]
Inventory [Line Items]
Inventories	5,543	5,708
Recycled Paperboard [Member]
Inventory [Line Items]
Inventories	10,024	7,814
Repair Parts and Supplies [Member]
Inventory [Line Items]
Inventories	128,706	126,983
Fuel and Coal [Member]
Inventory [Line Items]
Inventories	$ 21,443	$ 24,595

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- Definition

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+ References

No definition available.

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- Definition

Amount after valuation and LIFO reserves of inventory expected to be sold, or consumed within one year or operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 852
-SubTopic 10
-Name Accounting Standards Codification
-Section 55
-Paragraph 10
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481372/852-10-55-10

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483467/210-10-45-1

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(6))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

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