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Business and Summary of Significant Accounting Policies - Other Intangible Assets Additional Information (Details) (USD $)
In Millions, unless otherwise specified |
12 Months Ended | ||
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Jan. 31, 2014
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Jan. 31, 2013
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Jan. 31, 2012
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| Business and Summary of Significant Accounting Policies [Abstract] | |||
| Amortization of intangible assets | $ 80.7 | $ 82.0 | $ 71.8 |
| Weighted average useful life | 4 years 1 month 2 days | ||