Share Based Compensation - Restricted Stock Units (Details) - 2010 Stock Incentive Plan - $ / shares	12 Months Ended
Jan. 31, 2019	Jan. 31, 2018	Jan. 31, 2017
Time-vested RSUs
Number of restricted stock units
Outstanding, beginning of period (in shares)	146,849
Granted (in shares)	49,438
Vested (in shares)	(26,510)
Forfeited (in shares)	(3,752)
Outstanding, end of period (in shares)	166,025	146,849
Weighted average grant date fair value
Outstanding, beginning of period (in usd per share)	$ 21.81
Granted (in usd per share)	35.15	$ 29.33	$ 15.94
Vested (in usd per share)	19.34
Forfeited (in usd per share)	25.72
Outstanding, end of period (in usd per share)	$ 26.09	$ 21.81
Cumulative dividends, end of period	5,547
Performance-based Restricted Stock Units
Number of restricted stock units
Outstanding, beginning of period (in shares)	179,729
Granted (in shares)	23,213
Vested (in shares)	(44,091)
Forfeited (in shares)	(795)
Performance-based adjustment (in shares)	(6,244)
Outstanding, end of period (in shares)	164,300	179,729
Weighted average grant date fair value
Outstanding, beginning of period (in usd per share)	$ 19.40
Granted (in usd per share)	35.05	$ 29.20	$ 15.61
Vested (in usd per share)	20.10
Forfeited (in usd per share)	31.30
Performance-based adjustment (in usd per share)	30.37
Outstanding, end of period (in usd per share)	$ 22.44	$ 19.40
Cumulative dividends, end of period	4,581

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Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Performance Based Adjustment in Period

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hare-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Performance Based Adjustment Weighted Average Grant Date Fair Value

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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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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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The weighted average fair value at grant date for nonvested equity-based awards issued 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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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units.

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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