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Schedule of Inventories (Detail) - USD ($) $ in Thousands	Jun. 30, 2021	Mar. 31, 2021
Inventory [Line Items]
Inventories	$ 217,052	$ 235,749
Raw Materials and Material-in-Progress [Member]
Inventory [Line Items]
Inventories	79,200	92,696
Finished Cement [Member]
Inventory [Line Items]
Inventories	31,815	34,362
Aggregates [Member]
Inventory [Line Items]
Inventories	3,211	2,933
Gypsum Wallboard [Member]
Inventory [Line Items]
Inventories	4,354	4,177
Paperboard [Member]
Inventory [Line Items]
Inventories	4,321	5,031
Repair Parts and Supplies [Member]
Inventory [Line Items]
Inventories	85,020	86,750
Fuel and Coal [Member]
Inventory [Line Items]
Inventories	$ 9,131	$ 9,800

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ 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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section 45
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121566466&loc=d3e6676-107765

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.6(a))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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