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Acquisitions (Narrative) (Details) £ in Millions |  |  | 1 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
May 01, 2017 USD ($) | Apr. 06, 2017 GBP (£) | Oct. 31, 2017 USD ($) | Dec. 27, 2019 USD ($) | Dec. 28, 2018 USD ($) | Dec. 29, 2017 USD ($) | Apr. 06, 2017 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |
Purchase consideration |  |  |  | $ 1,010,000 |  | $ 11,268,000 |
Total share based compensation |  |  |  | 7,716,000 | $ 9,310,000 | 10,316,000 |
Jibe Consulting, Inc [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Effective date of acquisition | May 01, 2017 |  |  |  |  |  |
Purchase consideration | $ 5,400,000 |  |  |  |  |  |
Purchase consideration, common stock | $ 3,600,000 |  |  |  |  |  |
Common stock vesting period | 4 years |  |  |  |  |  |
Contingent consideration performance period | 18 months |  |  |  |  |  |
Total share based compensation |  |  |  | $ 600,000 | $ 900,000 |  |
Contributed total revenue |  |  |  |  |  | 12,300,000 |
Contribution before depreciation, amortization, interest, corporate overhead allocation and taxes |  |  |  |  |  | 1,200,000 |
Acquisition related costs |  |  |  |  |  | 200,000 |
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 | $ 700,000 |  |  |  |  |  |
Jibe Consulting, Inc [Member] | Stock Based Contingent Consideration [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Contingent consideration | $ 1,000,000 |  |  |  |  |  |
Aecus Limited [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Effective date of acquisition |  | Apr. 06, 2017 |  |  |  |  |
Purchase consideration | £ |  | £ 3.2 |  |  |  |  |
Contingent consideration |  |  |  |  |  |  | $ 0
Contributed total revenue |  |  |  |  |  | 3,900,000 |
Contribution before depreciation, amortization, interest, corporate overhead allocation and taxes |  |  |  |  |  | 500,000 |
Acquisition related costs |  |  |  |  |  | $ 100,000 |
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 |  |  |  |  |
The Chartered Institute of Management Accountants [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Purchase consideration |  |  | $ 2,000,000 |  |  |  |
Amortization period |  |  | 4 years |  |  |  |

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