Defined contribution plan contribution and administrative expenses.

No definition available.

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Period Type:	duration

- Definition

Defined contribution plan employers matching contribution vesting period.

+ References

No definition available.

+ Details

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Period Type:	duration

- Definition

The compensation expense recognized during the period pertaining to the deferred compensation arrangement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5047-113901

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 710
-SubTopic 10
-Section 30
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6409875&loc=d3e20015-108363

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of cost for defined contribution plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 70
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Percentage of employer's matching contributions to a defined contribution plan that vests in a given year.

+ References

No definition available.

+ Details

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Period Type:	duration

- 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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- Details

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- Details

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- Details

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Other Employee Benefit Plans (Details Textual) - USD ($) $ in Millions	12 Months Ended
	Jan. 31, 2018	Jan. 31, 2017	Jan. 31, 2016
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Contributions and expenses of administering the Employee benefit plans	$ 3.1	$ 3.1	$ 2.9
Matching contribution	5 years
Expenses related to the SERP	$ 0.6	0.9	$ 0.4
Former Vice Chairman and Chief Operating Officer
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Compensation related expenses associated with retirement		$ 0.3
Share-Based Compensation Award, Tranche One \| Maximum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Matching contribution, annual vesting percentage	5.00%
Share-Based Compensation Award, Tranche Two \| Maximum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Matching contribution, annual vesting percentage	10.00%