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SIGNIFICANT ACCOUNTING POLICIES AND DISCLOSURES (Details 4) - Stock Options [Member] - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
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May 27, 2017 | May 28, 2016 | May 30, 2015
Options, Outstanding [Roll Forward] |  |  |
Options outstanding at beginning | 1,019 | 1,137 | 1,065
Granted | 190 | 122 | 225
Exercised | (5) | (28) | (47)
Forfeited | (43) | (105) | (34)
Cancelled | (88) | (107) | (72)
Options outstanding at ending | 1,073 | 1,019 | 1,137
Options vested at ending | 628 |  |
Options, Outstanding, Weighted Average Exercise Price [Roll Forward] |  |  |
Options outstanding at beginning | $ 9.93 | $ 10.35 | $ 10.37
Granted | 6.9 | 5.88 | 9.92
Exercised | 5.61 | 5.18 | 6.53
Forfeited | 8.39 | 10.98 | 11.42
Cancelled | 11.17 | 9.97 | 11.19
Options outstanding at ending | 9.38 | $ 9.93 | $ 10.35
Options vested at ending | $ 10.21 |  |
Options, Weighted Average Remaining Contractual Term [Roll Forward] |  |  |
Options outstanding at ending | 6 years |  |
Options Vested | 4 years 4 months 24 days |  |
Options, Aggregate Intrinsic Value [Roll Forward] |  |  |
Options outstanding at ending | $ 85 |  |
Options vested at ending | $ 68 |  |

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- Definition Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(4) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Net number of share options (or share units) granted during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Amount by which current fair value of underlying stock exceeds exercise price of fully vested and expected to vest options outstanding. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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