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Acquisitions (Narrative) (Details) $ in Thousands, £ in Millions |  |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
May 01, 2017 USD ($) | Apr. 06, 2017 GBP (£) | Oct. 31, 2017 USD ($) | Dec. 28, 2018 USD ($) | Dec. 29, 2017 USD ($) | Dec. 30, 2016 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |
Purchase consideration |  |  |  |  | $ 11,268 |
Non-cash stock compensation expense |  |  |  | $ 9,310 | 10,316 | $ 8,765
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 |  |  |  | 3,000 |  |
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 |  |  |  | $ 200 |  |
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 |  |  | 4 years |  |  |

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