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Restructuring (Tables) | 12 Months Ended
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Apr. 30, 2015
Restructuring [Abstract] |
Restructuring and related charges |
|  | Long-Lived Asset Charges |  |  | Employee Separation |  |  | Site Preparation and Equipment Relocation |  |  | Production Start-up |  |  | Other Costs |  |  | Total |
Total restructuring charge |  | $ | 102.7 |  |  | $ | 64.0 |  |  | $ | 45.5 |  |  | $ | 42.2 |  |  | $ | 9.4 |  |  | $ | 263.8 |
Balance at May 1, 2012 |  | $ | — |  |  | $ | 8.8 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 8.8 |
Charge to expense |  |  | 8.2 |  |  |  | 3.4 |  |  |  | 13.4 |  |  |  | 10.8 |  |  |  | 3.0 |  |  |  | 38.8 |
Cash payments |  |  | — |  |  |  | (4.5) |  |  |  | (13.4) |  |  |  | (10.8) |  |  |  | (3.0) |  |  |  | (31.7) |
Noncash utilization |  |  | (8.2) |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (8.2) |
Balance at April 30, 2013 |  | $ | — |  |  | $ | 7.7 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 7.7 |
Charge to expense |  |  | 2.7 |  |  |  | 2.6 |  |  |  | 7.2 |  |  |  | 7.2 |  |  |  | 1.1 |  |  |  | 20.8 |
Cash payments |  |  | — |  |  |  | (8.4) |  |  |  | (7.2) |  |  |  | (7.2) |  |  |  | (1.1) |  |  |  | (23.9) |
Noncash utilization |  |  | (2.7) |  |  |  | (0.2) |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (2.9) |
Balance at April 30, 2014 |  | $ | — |  |  | $ | 1.7 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 1.7 |
Charge to expense |  |  | 0.1 |  |  |  | 0.5 |  |  |  | 5.3 |  |  |  | 8.4 |  |  |  | 1.1 |  |  |  | 15.4 |
Cash payments |  |  | — |  |  |  | (1.7) |  |  |  | (5.3) |  |  |  | (8.4) |  |  |  | (1.1) |  |  |  | (16.5) |
Noncash utilization |  |  | (0.1) |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (0.1) |
Balance at April 30, 2015 |  | $ | — |  |  | $ | 0.5 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 0.5 |

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- Definition Tabular disclosure of costs incurred for restructuring including, but not limited to, exit and disposal activities, remediation, implementation, integration, asset impairment, and charges against earnings from the write-down of assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 2: 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) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747 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 + Details
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