Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended	9 Months Ended
Feb. 28, 2015	Mar. 01, 2014	Feb. 28, 2015	Mar. 01, 2014
Operating activities:
Net income (loss)	$ (2,198)us-gaap_NetIncomeLoss	$ (532)us-gaap_NetIncomeLoss	$ (3,338)us-gaap_NetIncomeLoss	$ 1,960us-gaap_NetIncomeLoss
Adjustments to reconcile net income (loss) to cash provided by (used in) operating activities:
Depreciation and amortization	418	275	1,227	796
Gain on sale of investments	(6)us-gaap_GainLossOnSaleOfInvestments	(4)us-gaap_GainLossOnSaleOfInvestments	(15)us-gaap_GainLossOnSaleOfInvestments	(23)us-gaap_GainLossOnSaleOfInvestments
Gain on disposal of assets	(4)	0	(30)	0
Share-based compensation expense	143us-gaap_ShareBasedCompensation	201us-gaap_ShareBasedCompensation	529us-gaap_ShareBasedCompensation	585us-gaap_ShareBasedCompensation
Deferred income taxes	(498)	62	(665)	(105)
Change in assets and liabilities, net of effect of acquired businesses:
Accounts receivable	(2,361)	228	(2,655)	(1,498)
Income tax receivable	0	(319)	2,888	2,789
Inventories	(105)us-gaap_IncreaseDecreaseInInventories	273us-gaap_IncreaseDecreaseInInventories	(4,366)us-gaap_IncreaseDecreaseInInventories	133us-gaap_IncreaseDecreaseInInventories
Prepaid expenses and other assets	176	140	(727)	(134)
Accounts payable	(1,878)	(940)	(389)	(3,170)
Accrued liabilities	632	(73)	(469)	(2,528)
Non-current deferred income tax liabilities	0us-gaap_IncreaseDecreaseInIncomeTaxes	175us-gaap_IncreaseDecreaseInIncomeTaxes	0us-gaap_IncreaseDecreaseInIncomeTaxes	(302)us-gaap_IncreaseDecreaseInIncomeTaxes
Other	(25)	13	(32)	60
Net cash used in operating activities	(5,706)	(501)	(8,042)	(1,437)
Investing activities:
Cash consideration paid for acquired businesses	0	0	0	(973)
Capital expenditures	(1,314)	(840)	(3,250)	(1,821)
Proceeds from maturity of investments	750	203,757	31,957	258,289
Purchases of investments	(750)	(197,321)	(34,093)	(248,873)
Proceeds from sales of available-for-sale securities	112	76	186	152
Purchases of available-for-sale securities	(112)	(76)	(186)	(152)
Other	(98)	6	(128)	97
Net cash provided by (used in) investing activities	(1,412)	5,602	(5,514)	6,719
Financing activities:
Repurchase of common stock	(1,305)	0	(3,945)	(8,725)
Proceeds from issuance of common stock	13	13	301	184
Cash dividends paid	(808)us-gaap_PaymentsOfDividends	(829)us-gaap_PaymentsOfDividends	(2,453)us-gaap_PaymentsOfDividends	(2,514)us-gaap_PaymentsOfDividends
Other	2	(26)	0	(25)
Net cash used in financing activities	(2,098)	(842)	(6,097)	(11,080)
Effect of exchange rate changes on cash and cash equivalents	(2,272)	255	(4,701)	956
Increase/ (decrease) in cash and cash equivalents	(11,488)	4,514	(24,354)	(4,842)
Cash and cash equivalents at beginning of period	89,886	92,646	102,752	102,002
Cash and cash equivalents at end of period	$ 78,398	$ 97,160	$ 78,398	$ 97,160

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The net cash inflow or outflow from other financing activities. This element is used when there is not a more specific and appropriate element in the taxonomy.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 8

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3095-108585

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 9

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3098-108585

+ Details

Name:	us-gaap_ProceedsFromPaymentsForOtherFinancingActivities
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The cash inflow associated with the sale of debt and equity securities classified as available-for-sale securities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

-URI http://asc.fasb.org/extlink&oid=6516133

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 45

-Paragraph 11

-URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26853-111562

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 12

-Subparagraph (a),(b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585

+ Details

Name:	us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The cash inflow from sales of all investments, including securities and other assets, having ready marketability and intended by management to be liquidated, if necessary, beyond the current operating cycle.

+ References

No definition available.

+ Details

Name:	us-gaap_ProceedsFromSaleOfLongtermInvestments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585

+ Details

Name:	us-gaap_ShareBasedCompensation
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration