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Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Withheld Minimum Statutory Taxes

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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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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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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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Net number of non-option equity instruments granted to participants.

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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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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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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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An excess of the fair value of the modified award over the fair value of the award immediately before the modification.

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Number of share instruments newly issued under a share-based compensation plan.

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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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Purchase price of common stock expressed as a percentage of its fair value.

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Value, before forfeitures, of stock or other type of equity granted of any equity-based compensation plan other than an employee stock ownership plan (ESOP).

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Number of shares issued during the period as a result of an employee stock purchase plan.

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

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Stock-Based Compensation (Narrative) (Details)		3 Months Ended			9 Months Ended
Stock-Based Compensation (Narrative) (Details)	Oct. 18, 2016 item shares	May 31, 2017 USD ($) $ / shares shares	Feb. 28, 2017 USD ($) shares	May 28, 2016 USD ($)	May 31, 2017 USD ($) $ / shares shares	May 28, 2016 USD ($)	Aug. 31, 2016 $ / shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total shares awarded					55,014
Stock-based compensation expense \| $		$ 1,210,000		$ 1,048,000	$ 3,987,000	$ 2,922,000
Shares issued under terms of the award		49,090			186,933
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise price \| $ / shares		$ 11.67			$ 11.67		$ 11.41
Stock options exercised					62,500
Stock Options [Member] \| Chief Executive Officer [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options exercised			62,500
Stock Options [Member] \| Common Stock [Member] \| Chief Executive Officer [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares received from exercised options			30,079
Aggregate intrinsic value \| $			$ 500,000
Number of shares reduced, withheld for minimum statutory taxes			10,021
Performance Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
New shares granted	183,381
Stock-based incremental compensation expense from plan modification \| $					$ 0
Number of individual vesting conditions \| item	6
Number of performance measures \| item	2
Stock-based compensation expense \| $		$ 1,041,000		902,000	3,509,000	2,492,000
Performance Awards [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Life of awards	6 years
Unvested Share Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense \| $		131,000		112,000	369,000	338,000
Unvested Share Awards [Member] \| Director [Member] \| Fiscal 2017 Award [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Whole-share grant per eligible director \| $					$ 75,000
Vesting period of awards					1 year
Unvested Share Awards [Member] \| Board of Directors [Member] \| Fiscal 2017 Award [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation expense \| $		300,000			$ 300,000
Employee Stock Purchase Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense \| $		$ 38,000		$ 34,000	$ 94,000	$ 92,000
Price of common stock as a percent of the average fair market value					85.00%
Shares issued to employee stock purchase plan participants		12,061			30,342
2017 Employee Stock Purchase Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares authorized to be issued		1,000,000			1,000,000
Tranche One and Two [Member] \| Performance Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total shares awarded		36,676