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Acquisition (Narrative) (Details) $ in Thousands, £ in Millions |  |  | 1 Months Ended | 8 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | ---
May 01, 2017 USD ($) | Apr. 06, 2017 GBP (£) | Oct. 31, 2017 USD ($) | Dec. 29, 2017 USD ($) | Dec. 29, 2017 USD ($) | Dec. 29, 2017 USD ($) | Dec. 30, 2016 USD ($) | Jan. 01, 2016 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Purchase consideration |  |  |  |  |  | $ 11,268 |  |
Non-cash stock compensation expense |  |  |  |  |  | 10,316 | $ 8,765 | $ 10,361
Jibe Consulting, Inc [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Effective date of acquisition | May 01, 2017 |  |  |  |  |  |  |
Purchase consideration | $ 5,400 |  |  |  |  |  |  |
Purchase consideration, common stock | $ 3,600 |  |  |  |  |  |  |
Common stock vesting period | 4 years |  |  |  |  |  |  |
Contingent consideration | $ 11,000 |  |  |  |  |  |  |
Contingent consideration performance period | 18 months |  |  |  |  |  |  |
Non-cash stock compensation expense |  |  |  |  |  | 1,500 |  |
Purchase price allocation evaluation period from acquisition date | 12 months |  |  |  |  |  |  |
Contributed total revenue |  |  |  | $ 12,300 |  |  |  |
Contribution before depreciation, amortization, interest, corporate overhead allocation and taxes |  |  |  | $ 1,200 |  |  |  |
Acquisition related costs |  |  |  |  |  | 200 |  |
Jibe Consulting, Inc [Member] | Minimum [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Amortization period | 2 years |  |  |  |  |  |  |
Jibe Consulting, Inc [Member] | Maximum [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Amortization period | 5 years |  |  |  |  |  |  |
Jibe Consulting, Inc [Member] | Cash Contingent Consideration [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Contingent consideration | $ 6,600 |  |  |  |  |  |  |
Jibe Consulting, Inc [Member] | Stock Based Contingent Consideration [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Contingent consideration | $ 4,400 |  |  |  |  |  |  |
Aecus Limited [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Effective date of acquisition |  | Apr. 06, 2017 |  |  |  |  |  |
Purchase consideration | £ |  | £ 3.2 |  |  |  |  |  |
Contingent consideration performance period |  | 12 months |  |  |  |  |  |
Non-cash stock compensation expense |  |  |  |  |  | 1,300 |  |
Purchase price allocation evaluation period from acquisition date |  | 12 months |  |  |  |  |  |
Contributed total revenue |  |  |  |  | $ 3,900 |  |  |
Contribution before depreciation, amortization, interest, corporate overhead allocation and taxes |  |  |  |  | $ 500 |  |  |
Acquisition related costs |  |  |  |  |  | $ 100 |  |
Acquired percentage |  | 100.00% |  |  |  |  |  |
Aecus Limited [Member] | Minimum [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Amortization period |  | 2 years |  |  |  |  |  |
Aecus Limited [Member] | Maximum [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Amortization period |  | 5 years |  |  |  |  |  |
Aecus Limited [Member] | Cash Contingent Consideration [Member] | Sellers [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Contingent consideration | £ |  | £ 2.4 |  |  |  |  |  |
Aecus Limited [Member] | Cash Contingent Consideration [Member] | Key Personnel [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Contingent consideration | £ |  | 0.3 |  |  |  |  |  |
Aecus Limited [Member] | Stock Based Contingent Consideration [Member] | Key Personnel [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Contingent consideration | £ |  | £ 0.3 |  |  |  |  |  |
The Chartered Institute of Management Accountants [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Purchase consideration |  |  | $ 2,000 |  |  |  |  |
Amortization period |  |  | 10 years |  |  |  |  |

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- Definition Date when the acquirer obtains control of the acquiree, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=84229725&loc=d3e845-128460 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=84229725&loc=d3e848-128460 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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- Definition Percentage of voting equity interests acquired at the acquisition date in the business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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- Definition This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 23 -URI http://asc.fasb.org/extlink&oid=84229725&loc=d3e1043-128460 + Details
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- Definition The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3213-108585 + Details
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