Annual report pursuant to Section 13 and 15(d)

Income Taxes - Income Tax Provision (Benefit) for Continuing Operations Computed Using Federal Statutory Income Tax Rate (Parenthetical) (Detail)

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Income Taxes - Income Tax Provision (Benefit) for Continuing Operations Computed Using Federal Statutory Income Tax Rate (Parenthetical) (Detail) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Jan. 31, 2014
Jan. 31, 2013
Jan. 31, 2012
Income Tax Disclosure [Abstract]      
Other non-deductible expenses $ 0.3 $ 1.1 $ 0.8