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Plant Restructuring (narrative) (detail) - USD ($) $ in Thousands | 12 Months Ended
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Mar. 31, 2016 | Mar. 31, 2015 | Mar. 31, 2014 | Mar. 31, 2013
Plant Restructuring | $ 10,302 | $ 1,376 | $ 501 | $ 3,500
PropertySubjectToOperatingLeaseMember |  |  |  |
Plant Restructuring | 3,600 |  |  |
Midwest Plant Member [Member] |  |  |  |
Plant Restructuring | 100 |  |  |
Asset impairment cost |  |  |  |
Plant Restructuring | 5,600 |  |  |
Employee Severance [Member] |  |  |  |
Plant Restructuring | 200 | 800 |  |
Long Lived Asset Charges [Member] |  |  |  |
Plant Restructuring | 5,100 | 300 | $ 500 |
Other Restructuring [Member] |  |  |  |
Plant Restructuring | 5,100 | $ 300 |  |
Lease financing obligations [Member} |  |  |  |
Plant Restructuring | $ 5,300 |  |  |

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- Definition Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 5.P.3) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140864-122747 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 5.P.4(b)) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 5 -Section P -Subsection 3, 4 + Details
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