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Schedule of Inventories (Detail) - USD ($) $ in Thousands	Sep. 30, 2020	Mar. 31, 2020
Inventory [Line Items]
Inventories	$ 227,106	$ 272,121
Raw Materials and Materials-in-Progress [Member]
Inventory [Line Items]
Inventories	84,494	110,558
Finished Cement [Member]
Inventory [Line Items]
Inventories	28,866	43,538
Aggregates [Member]
Inventory [Line Items]
Inventories	3,544	8,416
Gypsum Wallboard [Member]
Inventory [Line Items]
Inventories	4,015	4,211
Paperboard [Member]
Inventory [Line Items]
Inventories	4,887	5,715
Repair Parts and Supplies [Member]
Inventory [Line Items]
Inventories	89,177	88,094
Fuel and Coal [Member]
Inventory [Line Items]
Inventories	$ 12,123	$ 11,589

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- Definition

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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