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Schedule of Inventories (Detail) - USD ($) $ in Thousands	Sep. 30, 2015	Mar. 31, 2015
Inventory [Line Items]
Inventories	$ 224,667	$ 235,464
Raw Materials and Material-in-Progress [Member]
Inventory [Line Items]
Inventories	107,698	115,345
Finished Cement [Member]
Inventory [Line Items]
Inventories	18,328	20,508
Gypsum Wallboard [Member]
Inventory [Line Items]
Inventories	7,422	7,741
Frac Sand [Member]
Inventory [Line Items]
Inventories	4,674	4,928
Aggregates [Member]
Inventory [Line Items]
Inventories	10,732	11,131
Paperboard [Member]
Inventory [Line Items]
Inventories	7,669	8,493
Repair Parts and Supplies [Member]
Inventory [Line Items]
Inventories	62,218	62,121
Fuel and Coal [Member]
Inventory [Line Items]
Inventories	$ 5,926	$ 5,197

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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/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



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