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Business Combinations (Details) $ / shares in Units, $ in Thousands, T in Millions |  | 12 Months Ended |
--- | --- | --- | ---
Sep. 18, 2020 USD ($) $ / shares | Dec. 31, 2020 USD ($) | Mar. 31, 2021 T
Business Acquisition [Line Items] |  |  |
Base price consideration | $ 2,000 |  |
Business Acquisition, Volume Weighted Average Share Price | $ / shares | $ 1.33 |  |
Business Acquisition, Share Price | $ / shares | $ 1.37 |  |
Total purchase consideration | $ 2,080 |  |
Shares issued | 1,504 |  |
Processing capacity | T |  |  | 7.1
Cash | $ 309 |  |
Accounts receivable | 75 |  |
Inventory | 2,459 |  |
Prepaid expenses and other current assets | 124 |  |
Property, plant and equipment | 60,310 |  |
Right-of-use assets | 9,603 |  |
Total assets acquired | 72,880 |  |
Accounts payable | 16 |  |
Business Combination, Liabilities Assumed, Accrued Expense and Other Liabilities | 2,008 |  |
Asset retirement obligations | 8,424 |  |
Operating lease liabilities | 9,603 |  |
Deferred income taxes | 11,149 |  |
Total liabilities assumed | 31,200 |  |
Estimated fair value of net assets acquired | 41,680 |  |
Business Combination, Bargain Purchase, Gain Recognized, Amount | 39,600 |  |
Eagle Materials Holdings [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable | 2,060 |  |
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Working Capital | $ 20 |  |
Business Combination, Acquisition Related Costs |  | $ 891 |
Eagle Materials Holdings [Member] | BNSF [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Processing capacity | T |  |  | 1.6

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- Definition This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 23 -URI http://asc.fasb.org/extlink&oid=123586518&loc=d3e1043-128460 + Details
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- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions, acquired at the acquisition date. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=123413009&loc=d3e4845-128472 + Details
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- Definition Amount due from customers or clients for goods or services, including trade receivables, that have been delivered or sold in the normal course of business, and amounts due from others, including related parties expected to be converted to cash, sold or exchanged within one year or the normal operating cycle, if longer, acquired at the acquisition date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=123413009&loc=d3e4845-128472 + Details
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- Definition Amount of liabilities incurred for goods and services received that are used in an entity's business and related party payables, assumed at the acquisition date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=123413009&loc=d3e4845-128472 + Details
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- Definition Amount of deferred tax liability attributable to taxable temporary differences assumed at the acquisition date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=123413009&loc=d3e4845-128472 + Details
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