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Credit Agreement (SVB Credit Agreement) (Narrative) (Details) - Silicon Valley Bank - USD ($) $ in Thousands		6 Months Ended	12 Months Ended
	Oct. 31, 2009	Jun. 30, 2018	Dec. 30, 2017
Line of Credit Facility
Maximum borrowing capacity as a percentage of eligible accounts receivable	80.00%
Maximum borrowing capacity	$ 5,000
Outstanding borrowings		$ 2,100	$ 2,000
Availability remaining		$ 20	100
Prime Rate
Line of Credit Facility
Debt instrument, basis spread on variable rate		2.75%
Letter of Credit
Line of Credit Facility
Outstanding borrowings		$ 1,100	$ 2,800

X

- Definition

Line of Credit Facility, Covenant Terms, Maximum borrowing Capacity as a Percentage of Eligible Accounts Receivable

+ References

No definition available.

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- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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- Definition

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.

+ References

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- Definition

Maximum amount borrowed under the credit facility at any time during the period.

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- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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