Number of Plans With Share-Based Awards Outstanding

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- Definition

Share based compensation arrangement by share based payment award options vested in period.

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Stock Based Compensation [Line Items]

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Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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- Definition

Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Amount of cost to be recognized for nonvested award under share-based payment arrangement. Excludes share and unit options.

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- Definition

Amount of cost to be recognized for option under share-based payment arrangement.

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- Definition

Amount of cash inflow from realized tax benefit related to deductible compensation cost reported on the entity's tax return for equity instruments in excess of the compensation cost for those instruments recognized for financial reporting purposes.

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- Definition

Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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- Definition

The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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- Definition

Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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- Definition

The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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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.

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Fair value of options vested. Excludes equity instruments other than options, for example, but not limited to, share units, stock appreciation rights, restricted stock.

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Number of share options (or share units) exercised during the current period.

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Stock Option Plans - Additional Information (Detail)	12 Months Ended
Stock Option Plans - Additional Information (Detail)	Jan. 31, 2020 USD ($) plan $ / shares shares	Jan. 31, 2019 USD ($) $ / shares shares	Jan. 31, 2018 USD ($) $ / shares shares
Stock Based Compensation [Line Items]
Compensation expense related to stock-based awards granted	$ 854,000	$ 781,000	$ 903,000
Weighted average grant-date fair value of options granted \| $ / shares	$ 1.77	$ 1.80	$ 2.02
Excess tax benefit from share-based compensation	$ 0	$ 0	$ 0
Number of plans with share-based awards outstanding \| plan	5
Intrinsic value of options exercised	$ 0
Number of options exercised \| shares	9,000	0	0
Fair value of options vested	$ 650,000	$ 850,000	$ 500,000
Options vested \| shares	335,000
Total unrecognized compensation expense related to unvested stock options	$ 1,000,000
Expense expected to be recognized over weighted average period	1 year 7 months 6 days
Restricted Stock
Stock Based Compensation [Line Items]
Total unrecognized compensation expense related to unvested restricted stock awards	$ 0
2006 Plan
Stock Based Compensation [Line Items]
Vesting period of stock options granted and outstanding	3 years
Contractual term of stock options granted and outstanding	10 years
Shares available for grant \| shares	1,050,000
1994 Plan
Stock Based Compensation [Line Items]
Vesting period of stock options granted and outstanding	3 years
Contractual term of stock options granted and outstanding	10 years
1998 Plan
Stock Based Compensation [Line Items]
Vesting period of stock options granted and outstanding	3 years
Contractual term of stock options granted and outstanding	10 years
2000 Plan
Stock Based Compensation [Line Items]
Vesting period of stock options granted and outstanding	3 years
Contractual term of stock options granted and outstanding	10 years
Director Plan
Stock Based Compensation [Line Items]
Vesting period of stock options granted and outstanding	1 year
Contractual term of stock options granted and outstanding	10 years