Defined benefit plan minimum age for vesting under plan.

No definition available.

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- Definition

Defined benefit plan period considered in case of involuntary termination.

+ References

No definition available.

+ Details

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- Definition

Defined contribution plan additional contribution per employee percent.

+ References

No definition available.

+ Details

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- Definition

Defined contribution plan annual contribution per employee percent.

+ References

No definition available.

+ Details

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- Definition

Employee age condition for participation in plan.

+ References

No definition available.

+ Details

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- Definition

Employee minimum hours worked condition for participation in plan.

+ References

No definition available.

+ Details

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- Definition

Employee service period condition for discretionary matching contribution.

+ References

No definition available.

+ Details

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- Definition

Maximum contribution percent of deferred compensation plan.

+ References

No definition available.

+ Details

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- Definition

Maximum percent of contribution of salary of employee.

+ References

No definition available.

+ Details

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- Definition

Number of officers to whom supplemental executive retirement plan assets distributed.

+ References

No definition available.

+ Details

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- Definition

Period of service of full time employee under plan.

+ References

No definition available.

+ Details

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- Definition

Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 30

-Section 35

-Paragraph 50

-URI http://asc.fasb.org/extlink&oid=29635418&loc=d3e12355-114930

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- Definition

The total amount of net periodic benefit cost for defined benefit plans for the period. Periodic benefit costs include the following components: service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) due to settlements or curtailments.

+ References

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- Definition

The amount of the cost recognized during the period for defined contribution plans.

+ 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=6414718&loc=d3e28014-114942

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- Definition

Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan.

+ References

No definition available.

+ Details

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- Definition

Sum of the allocated, committed-to-be-released and suspense shares of the entity held by the plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 40

-Section 50

-Paragraph 1

-Subparagraph (d)

-URI http://asc.fasb.org/extlink&oid=6418621&loc=d3e17540-113929

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Benefit Plans - Additional Information (Detail) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
	Jan. 31, 2014 Employee Age	Jan. 31, 2013	Jan. 31, 2012
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Age condition under Associate Stock Ownership Plan	21
Employee hours worked	1000 hours
Contribution from salary	25.00%
Quarterly contribution	25.00%
Deferral of compensation	6.00%
Discretionary match allocated solely	6 months
Expenses related to plan	$ 0.2	$ 0.3	$ 0.2
Number of officers to whom supplemental executive retirement plan assets distributed	4
Supplemental Executive Retirement Plan ("SERP")
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Additional contribution	10.00%
Minimum age for vesting under plan	60
SERP Assets	1.9	2.1
Period considered in case of involuntary termination	2 years
Expense related to SERP	$ 0.1	$ 0.3	$ 0.2
Supplemental Executive Retirement Plan ("SERP") \| Minimum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Annual contribution	5.00%
Supplemental Executive Retirement Plan ("SERP") \| Maximum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Annual contribution	10.00%
Associate Stock Ownership Plan ("ASOP")
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Age condition under Associate Stock Ownership Plan	21
Employee hours worked	1000 hours
Period of service of full time employee under plan	1 year
Common shares held	323,266	350,372	352,414