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Restructuring Charges - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Apr. 30, 2013 | Apr. 30, 2012 | Apr. 30, 2013 | Apr. 30, 2012 | Oct. 31, 2012
Restructuring and Related Cost [Abstract] |  |  |  |  |
Restructuring charges | $ (0.1) | $ 10.1 | $ 1.2 | $ 19.0 |
Amounts expected to be incurred |  |  | 7.2 |  | 12.3
Employee Separation Costs [Member] |  |  |  |  |
Restructuring and Related Cost [Abstract] |  |  |  |  |
Restructuring charges | (1.0) |  | (0.4) |  |
Asset Impairments [Member] |  |  |  |  |
Restructuring and Related Cost [Abstract] |  |  |  |  |
Restructuring charges | 0.4 |  | 0.5 |  |
Other Restructuring Costs [Member] |  |  |  |  |
Restructuring and Related Cost [Abstract] |  |  |  |  |
Restructuring charges | $ 0.5 |  | $ 1.1 |  |

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- Definition Amount charged against earnings in the period for incurred and estimated costs associated with exit from or disposal of business activities or restructurings pursuant to a duly authorized plan, excluding asset retirement obligations. + References Reference 1: 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=6394695&loc=d3e140864-122747 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 5 -Section P -Subsection 3, 4 Reference 3: 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=6943989&loc=d3e3602-108585 Reference 4: 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 5: 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=6394695&loc=d3e140904-122747 + Details
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