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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
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