Stock-based Compensation Expense (Assumption Used to Estimate the Fair Value of Stock-Based Awards) (Details) - shares	3 Months Ended	9 Months Ended
Oct. 31, 2019	Oct. 31, 2018	Oct. 31, 2019	Oct. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected dividends (in percentage)			0.00%
Performance Stock Unit
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of expected volatilities (in percentage)			36.30%	35.70%
Expected dividends (in percentage)			0.00%	0.00%
Range of risk-free interest rates (in percentage)			2.50%
Awards granted in period (shares)	0	0	300,000
1998 Employee Qualified Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected dividends (in percentage)	0.00%	0.00%	0.00%	0.00%
1998 Employee Qualified Stock Purchase Plan \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of expected volatilities (in percentage)	32.70%	32.70%	32.70%	32.70%
Range of expected lives (in years)	6 months	6 months	6 months	6 months
Range of risk-free interest rates (in percentage)	1.70%	2.30%	1.70%	1.90%
1998 Employee Qualified Stock Purchase Plan \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of expected volatilities (in percentage)	35.90%	34.60%	39.70%	37.50%
Range of expected lives (in years)	2 years	2 years	2 years	2 years
Range of risk-free interest rates (in percentage)	1.90%	2.80%	2.50%	2.80%

The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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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.

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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.

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- Definition

The risk-free interest rate assumption that is used in valuing an option on its own shares.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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No definition available.

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- Definition

Expected term of award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-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=116856206&loc=d3e5070-113901

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-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=115993241&loc=d3e301413-122809

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