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Segment Breakdown of Goodwill (Detail) - USD ($) $ in Thousands | Sep. 30, 2015 | Mar. 31, 2015
--- | --- | ---
Segment Reporting Information [Line Items] |  |
Goodwill | $ 133,885 | $ 132,515
Cement [Member] |  |
Segment Reporting Information [Line Items] |  |
Goodwill | 9,729 | 8,359
Gypsum Wallboard [Member] |  |
Segment Reporting Information [Line Items] |  |
Goodwill | 116,618 | 116,618
Paperboard [Member] |  |
Segment Reporting Information [Line Items] |  |
Goodwill | $ 7,538 | $ 7,538

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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 + Details
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Balance Type: | debit
Period Type: | instant

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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. + Details
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- Details
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- Details
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- Details
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