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Stock-Based Compensation Plans (Narrative) (Details) - USD ($)	3 Months Ended		9 Months Ended		12 Months Ended
	Feb. 23, 2019	Feb. 24, 2018	Feb. 23, 2019	Feb. 24, 2018	May 26, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for grant	1,506,000		1,506,000
Stock options vesting period			4 years
Stock options exercise, intrinsic value	$ 1,900,000	$ 900,000	$ 5,000,000	$ 1,300,000
Unrecognized compensation cost related to stock-based compensation	9,300,000		$ 9,300,000
Weighted-average period of cost to be recognized			36 months
Stock-based compensation expense	$ 1,900,000	$ 1,400,000	$ 4,961,000	4,499,000
Capitalized share based compensation costs			$ 0	$ 0
Restricted stock, shares granted	21,537	37,778	21,537	117,588
Stock Incentive Plan 2014 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares of common stock made available for awards	2,400,000		2,400,000
Stock options vesting period			4 years
Stock options termination period			10 years
Stock split conversion ratio			2.5
Employee Stock Purchase Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares of common stock made available for awards	5,900,000		5,900,000
Shares available for grant	221,000		221,000
Percentage of exercise price per share out of fair market value			85.00%
Common stock issued			359,000		338,000
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based compensation expense for restricted shares	$ 83,000	$ 18,000	$ 157,000	$ 18,000
Unvested restricted shares	77,789		77,789
Total unrecognized compensation cost	$ 1,200,000		$ 1,200,000
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based compensation expense for restricted shares	$ 400,000	$ 400,000	$ 1,200,000	$ 1,000,000
Unvested restricted shares	158,926		158,926
Total unrecognized compensation cost	$ 2,200,000		$ 2,200,000

X

- Definition

Represents the compensation cost capitalized during the period arising from equity-based compensation arrangements (for example, shares of stock, units, 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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Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation.

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The noncash expense that represents the cost of restricted stock or unit distributed to employees as compensation.

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The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

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

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Total number of shares issued during the period, including shares forfeited, as a result of Restricted Stock Awards.

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Ratio applied to the conversion of stock split, for example but not limited to, one share converted to two or two shares converted to one.

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