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Commitments and Contingencies (Tables) | 6 Months Ended
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Oct. 31, 2014
Commitments and Contingencies Disclosure [Abstract] |
Schedule of Environmental Liability Associated with Postdam | The changes to the environmental remediation liability associated with the Potsdam environmental remediation liability for the six months ended October 31, 2014 and 2013 are as follows:
|  | Six Months Ended October 31, |
|  | 2014 |  |  | 2013 |
Beginning balance |  | $ | 5,320 |  |  | $ | 5,297 |
Obligations incurred |  |  | — |  |  |  | 31 |
Accretion expense |  |  | 69 |  |  |  | 69 |
Payments |  |  | (270 | ) |  |  | — |
Ending balance |  | $ | 5,119 |  |  | $ | 5,397 |

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- Definition Tabular disclosure of environmental loss contingencies by individual site. Does not include loss contingencies that are not environmental in nature. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 5.Y.Q2) -URI http://asc.fasb.org/extlink&oid=27011672&loc=d3e149879-122751 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13207-110859 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13296-110859 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13283-110859 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 50 -Paragraph 10 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13237-110859 + Details
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