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Acquisitions (Narrative) (Details) $ in Thousands, £ in Millions |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | --- | ---
May 01, 2017 USD ($) | Apr. 06, 2017 GBP (£) | Oct. 31, 2017 USD ($) | Sep. 27, 2019 USD ($) | Sep. 28, 2018 USD ($) | Sep. 27, 2019 USD ($) | Sep. 28, 2018 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |
Non-cash stock compensation expense |  |  |  |  |  | $ 5,733 | $ 6,932
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 |  |  |  |  |  |
Cash compensation (expense) benefit |  |  |  | $ 100 | $ (800) | 1,100 | 3,800
Jibe Consulting, Inc [Member] | Cost of Sales [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Non-cash stock compensation expense |  |  |  | 34 |  | (200) |
Jibe Consulting, Inc [Member] | Key Employees [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Cash compensation (expense) benefit |  |  |  | 32 | $ (100) | 200 | $ 100
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 |  |  |  |  |
Cash compensation (expense) benefit |  |  |  | $ 200 |  | $ 24 |
Acquired percentage |  | 100.00% |  |  |  |  |
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 |  |  |  |

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