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Number of common stock with held by company.

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Number of options granted with exercise price less than fair market value on grant date.

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Number of shares of restricted stock granted to each director annually.

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Maximum number of shares that may be issued as restricted stock or restricted stock units under the stock award plan.

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Share based compensation arrangement by share based payment award number of shares authorized to be issued as restricted stock awards or restricted stock units.

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Share based compensation arrangement by share based payment award options exercised in period aggregate exercise price.

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Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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Unrecognized cost of unvested share-based compensation awards.

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Disclosure of the aggregate tax benefit realized from the exercise of stock options and the conversion of similar instruments during the annual period.

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Amount of cash outflow to satisfy an employee's income tax withholding obligation as part of a net-share settlement of a share-based award.

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The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.

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Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Date the equity-based award expires, in CCYY-MM-DD format.

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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.

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The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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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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Number of options outstanding, including both vested and non-vested options.

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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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

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Equity Award Plans - Additional Information (Details) $ / shares in Units, $ in Thousands	4 Months Ended	12 Months Ended
	Jan. 31, 2015 USD ($) $ / shares shares	Jan. 30, 2016 USD ($) Executives $ / shares shares	Sep. 30, 2014 USD ($) $ / shares shares	Sep. 30, 2013 USD ($) $ / shares shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Options outstanding	832,000	720,000	454,000
Number of stock options granted with exercise price less than fair market value on grant date	0	0	0	0
Total intrinsic value of stock options exercised \| $	$ 93	$ 63	$ 3,576	$ 2,080
Proceeds from exercise of stock options \| $	29	69	271	744
Actual tax benefit realized for tax deductions from stock option exercised \| $	$ 35	$ 24	$ 1,347	$ 784
Exercise of stock options, shares	12,000	11,000
Net-share settled by company	4,455		68,739	39,934
Weighted average fair value of stock options \| $ / shares	$ 3.04	$ 2.58	$ 8.21	$ 7.98
Number of executive officers granted performance based RSU \| Executives		4
Performance period		3 years
Unrecognized compensation cost \| $		$ 3,801
Weighted-average period recognized compensation cost		1 year 4 months 24 days
Stock-based compensation expense \| $	$ 1,073	$ 2,784	$ 3,747	$ 2,771
Repurchase of common stock, shares	8,257	15,024	76,386	34,125
Payments for tax obligations to the tax authorities on exercise or vesting date \| $	$ 123	$ 127	$ 2,178	$ 725
2005 Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Options to be issued		2,800,000
Common stock shares issued, restricted stock units		1,500,000
Common stock available for grant		593,443
Shares issued in respect of restricted stock		429,264
Exercise of stock options, shares	10,000		176,899	101,949
Aggregate exercise price \| $	$ 69		$ 1,976	$ 890
2005 Plan \| Employee Stock Option
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based payment award, expiration period		10 years
2005 Plan \| Minimum \| Employee Stock Option
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based payment award, vesting period		4 years
2005 Plan \| Minimum \| Restricted Stock
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based payment award, expiration period		1 year
2005 Plan \| Maximum \| Employee Stock Option
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based payment award, vesting period		5 years
2005 Plan \| Maximum \| Restricted Stock
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based payment award, expiration period		5 years
1987 Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Options outstanding		1,000
Stock option plan expiration date		Dec. 09, 2007
Non-executive chairman
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Restricted stock, shares vested		6,000
Non-employee director
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Restricted stock, shares vested		4,000
2012 Awards
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Cumulative restricted stock units available for future declaration		0