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Stock-based Compensation Expense Assumption Used to Estimate the Fair Value of Stock-Based Awards (Details) | 3 Months Ended | 9 Months Ended
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Oct. 31, 2014 | Oct. 31, 2013 | Oct. 31, 2014 | Oct. 31, 2013
ESP Plan |  |  |  |
Share based Compensation Arrangement by Share based Payment Award, Fair Value Assumptions, Method Used [Line Items] |  |  |  |
Expected dividends | 0.00% |  | 0.00% |
ESP Plan | Minimum |  |  |  |
Share based Compensation Arrangement by Share based Payment Award, Fair Value Assumptions, Method Used [Line Items] |  |  |  |
Range of expected volatilities | 29.00% | 30.00% | 29.00% | 27.00%
Range of expected lives (in years) | 6 months | 6 months | 6 months | 6 months
Expected dividends | 0.00% | 0.00% |  |
Range of risk-free interest rates | 0.00% | 0.10% | 0.00% | 0.10%
ESP Plan | Maximum |  |  |  |
Share based Compensation Arrangement by Share based Payment Award, Fair Value Assumptions, Method Used [Line Items] |  |  |  |
Range of expected volatilities | 30.00% | 35.00% | 33.00% | 36.00%
Range of expected lives (in years) | 2 years | 2 years | 2 years | 2 years
Expected dividends | 0.00% |  |  |
Range of risk-free interest rates | 0.60% | 0.40% | 0.60% | 0.40%
Performance Stock Unit |  |  |  |
Share based Compensation Arrangement by Share based Payment Award, Fair Value Assumptions, Method Used [Line Items] |  |  |  |
Range of expected volatilities |  |  | 30.00% | 34.00%
Expected dividends | 0.00% |  | 0.00% |
Range of risk-free interest rates |  |  | 0.10% | 0.10%

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- Definition The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.D.2) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section D -Subsection 2 + Details
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- Definition The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The risk-free interest rate assumption that is used in valuing an option on its own shares. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iv) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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