Employee Benefit Plans \| Retirement Savings Plan (Details) - Retirement Savings Plan [Member] - USD ($) $ in Millions	12 Months Ended
Jan. 31, 2019	Jan. 31, 2018	Jan. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Deferred Compensation Arrangement With Individual, Employer Matching Contribution, Percentage	50.00%
Deferred Compensation Arrangement With Individual Maximum Employer Matching Of Participant Deferrals, Percentage	6.00%
Deferred Compensation Arrangement with Individual, Requisite Service Period	4 years
Deferred Compensation Arrangement with Individual, Contributions by Employer	$ 6.7	$ 6.4	$ 3.1

Deferred Compensation Arrangement With Individual, Employer Matching Contribution, Percentage

No definition available.

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- Definition

Deferred compensation arrangement with individual maximum employer matching of participant deferrals percentage

+ References

No definition available.

+ Details

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- Definition

Amount of contributions made by employer into fund established for purposes of making future disbursement to individual in accordance with deferred compensation arrangement.

+ References

No definition available.

+ Details

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- Definition

Minimum period the individual is required to perform services to be fully vested under the deferred compensation arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the 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 710
-SubTopic 10
-Section 55
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=6409961&loc=d3e20487-108367

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901

+ Details

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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.

+ References

No definition available.

+ Details

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- Details

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