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Goodwill and Other Intangible Assets - Summary of Carrying Amount of Net Intangible Assets by Class (Detail) (USD $) In Millions, unless otherwise specified | Oct. 31, 2012 | Jan. 31, 2012 | Oct. 31, 2011 | Jul. 31, 2011 | Apr. 30, 2011 | Jan. 31, 2011 | Oct. 31, 2010
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Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |
Gross Intangible Assets | $ 271.8 |  | $ 286.3 |  |  |  |
Accumulated Amortization | 73.2 |  | 57.5 |  |  |  |
Net Intangible Assets | 198.6 | 213.9 | 228.8 | 240.5 | 171.2 | 169.4 | 172.5
Trademarks and patents [Member] |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |
Gross Intangible Assets | 32.5 |  | 47.4 |  |  |  |
Accumulated Amortization | 3.6 |  | 17.7 |  |  |  |
Net Intangible Assets | 28.9 |  | 29.7 |  |  |  |
Non-compete agreements [Member] |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |
Gross Intangible Assets | 14.4 |  | 22.8 |  |  |  |
Accumulated Amortization | 11.1 |  | 9.3 |  |  |  |
Net Intangible Assets | 3.3 |  | 13.5 |  |  |  |
Customer relationships [Member] |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |
Gross Intangible Assets | 201.1 |  | 183.0 |  |  |  |
Accumulated Amortization | 53.6 |  | 22.8 |  |  |  |
Net Intangible Assets | 147.5 |  | 160.2 |  |  |  |
Other [Member] |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |
Gross Intangible Assets | 23.8 |  | 33.1 |  |  |  |
Accumulated Amortization | 4.9 |  | 7.7 |  |  |  |
Net Intangible Assets | $ 18.9 |  | $ 25.4 |  |  |  |

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