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Commitments and Contingencies - Additional Information (Detail) - USD ($)			1 Months Ended	12 Months Ended
	May 08, 2018	Jan. 05, 2018	Mar. 31, 2018	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017
Commitments And Contingencies [Line Items]
Letters of credit outstanding, amount				$ 7,700,000
Contingently liable for performance, current				26,300,000
Outstanding guarantees				$ 0
Percentage of expected natural gas usage				25.00%
Operating leases Rental expense				$ 12,300,000	$ 12,000,000	$ 11,300,000
American Gypsum Company LLC [Member] | Homebuilder Settlement Agreement [Member]
Commitments And Contingencies [Line Items]
Litigation settlement amount	$ 6,000,000
American Gypsum Company LLC [Member] | Direct and Indirect Purchaser Class [Member] | Direct and Indirect Purchaser Settlement Agreements [Member]
Commitments And Contingencies [Line Items]
Litigation settlement amount		$ 39,100,000
Amount deposited to qualified settlement fund			$ 38,800,000

X

- Definition

Amount deposited to qualified settlement fund.

+ References

No definition available.

+ Details

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Balance Type:	debit
Period Type:	duration

X

- Definition

Commitments and contingencies.

+ References

No definition available.

+ Details

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Namespace Prefix:	exp_
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Balance Type:	na
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X

- Definition

Contingent liability for performance bonds required by states municipalities and related agencies.

+ References

No definition available.

+ Details

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Namespace Prefix:	exp_
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Balance Type:	credit
Period Type:	instant

X

- Definition

Percentage of expected natural gas usage.

+ References

No definition available.

+ Details

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X

- Definition

This item represents a non-contingent liability for the fair value of an obligation to stand ready to perform over the term of a guaranty issued in the event that specified triggering events or conditions occur.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03.15)
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.15)
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 460
-SubTopic 10
-Section 25
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=82913062&loc=d3e11019-110243

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 460
-SubTopic 10
-Section 25
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=82913062&loc=d3e11049-110243

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Period Type:	instant

X

- Definition

Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line.

+ References

No definition available.

+ Details

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X

- Definition

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

+ References

No definition available.

+ Details

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- Definition

Amount awarded to other party in judgment or settlement of litigation.

+ References

No definition available.

+ Details

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- Details

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