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Organization and Nature of Business (Detail) T in Millions	Mar. 31, 2021 T
Business Acquisition [Line Items]
Processing capacity	7.1
Eagle Materials Holdings [Member] | BNSF [Member]
Business Acquisition [Line Items]
Processing capacity	1.6

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- Definition

Current annual processing capacity.

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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.

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