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Revenue Recognition - Reserves for Variable Consideration and Credit Risk (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 27, 2020	Jun. 29, 2019	Jun. 27, 2020	Jun. 29, 2019	Dec. 28, 2019
Adjustments to the allowances for accounts receivable and unbilled services related to reserves for credit risk
Beginning balance			$ 370	$ 639	$ 639
Cumulative effect of a change in accounting principle related to ASC 326			203
Provision for credit loss expense, net of recoveries			(43)		173
Amounts written off			(138)		(442)
Ending balance	$ 392		392		$ 370
Bad debt expense, net of recoveries of previously written off allowances
Bad debt expense (recovery), net	(102)	$ 48	(43)	31
Roll forward of the variable consideration and allowances for unbilled services
Additions to reserves for variable consideration	1,705	2,725	3,119	4,158
Reimbursable expenses	$ 14,815	$ 12,178	$ 31,245	$ 25,013

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- Definition

Amount of adjustments to allowance for accounts receivable and allowance for unbilled services for variable consideration.

+ References

No definition available.

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- Definition

Amount of allowance for doubtful accounts receivable cumulative effect of change.

+ References

No definition available.

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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- Definition

It represents information about bad debt recovery (recovery).

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No definition available.

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No definition available.

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- Definition

Amount of expense (reversal of expense) for expected credit loss on accounts receivable related to credit risk.

+ References

No definition available.

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- Definition

Amount of reimbursable expenses, which include expenses for travel and other out-of-pocket expenses, outside consultants, and other reimbursable expenses. Revenues include reimbursable expenses.

+ References

No definition available.

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- Definition

Amount of allowance for credit loss on accounts receivable.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 13
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=119407570&loc=SL82919249-210447

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=118936363&loc=d3e5074-111524

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 13
-Subparagraph (f)
-URI http://asc.fasb.org/extlink&oid=119407570&loc=SL82919249-210447

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=118955202&loc=SL82895884-210446

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- Definition

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- Definition

Amount of direct write-downs of accounts receivable charged against the allowance.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 13
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=119407570&loc=SL82919249-210447

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