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Acquisitions - Narrative (Details) - USD ($) |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jan. 02, 2019 | Sep. 05, 2017 | Apr. 01, 2018 | Dec. 29, 2019 | Dec. 30, 2018
Business Acquisition [Line Items] |  |  |  |  |
Additions to Goodwill |  |  |  | $ 20,500,000 |
NextGen Global Resources LLC |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Ownership percentage acquired (percent) | 100.00% |  |  |  |
Purchase price of acquisition | $ 51,000,000.0 |  |  |  |
Purchase price paid at closing | 54,300,000 |  |  |  |
Intangible assets acquired | $ 21,500,000 |  |  |  |
Pro forma information, revenue of acquiree since acquisition date, actual |  |  |  | 78,300,000 |
Pro forma information, earnings or loss of acquiree since acquisition date, actual |  |  |  | 4,500,000 |
Business combination, revenue reported by acquired entity for prior period |  |  |  |  | $ 67,800,000
Business combination, net earnings reported by acquired entity for prior period |  |  |  |  | 3,000,000.0
Global Technology Associates, LLC |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Ownership percentage acquired (percent) | 100.00% |  |  |  |
Purchase price of acquisition | $ 34,000,000.0 |  |  |  |
Purchase price paid at closing | 35,700,000 |  |  |  |
Intangible assets acquired | 17,300,000 |  |  |  |
Pro forma information, revenue of acquiree since acquisition date, actual |  |  |  | 62,800,000 |
Pro forma information, earnings or loss of acquiree since acquisition date, actual |  |  |  | 4,500,000 |
Business combination, revenue reported by acquired entity for prior period |  |  |  |  | 42,500,000
Business combination, net earnings reported by acquired entity for prior period |  |  |  |  | 3,300,000
Teachers On Call, Inc. |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Ownership percentage acquired (percent) |  | 100.00% |  |  |
Purchase price of acquisition |  | $ 41,000,000.0 |  |  |
Purchase price paid at closing |  | 39,000,000.0 |  |  |
Intangible assets acquired |  | 18,300,000 |  |  |
Additions to Goodwill |  |  | $ 200,000 |  |
Goodwill expected to be deductible |  |  |  | 18,800,000 |
Indemnification asset recognized as of the acquisition date |  | $ 2,800,000 |  |  |
Indemnification asset |  |  |  | $ 0 | $ 100,000
Customer Relationships | NextGen Global Resources LLC |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Intangible assets acquired | $ 12,900,000 |  |  |  |
Acquired finite-lived intangible assets, weighted average useful life (years) | 10 years |  |  |  |
Customer Relationships | Global Technology Associates, LLC |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Intangible assets acquired | $ 12,100,000 |  |  |  |
Acquired finite-lived intangible assets, weighted average useful life (years) | 10 years |  |  |  |
Trade Names | NextGen Global Resources LLC |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Intangible assets acquired | $ 8,100,000 |  |  |  |
Acquired finite-lived intangible assets, weighted average useful life (years) | 15 years |  |  |  |
Trade Names | Global Technology Associates, LLC |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Intangible assets acquired | $ 4,000,000.0 |  |  |  |
Acquired finite-lived intangible assets, weighted average useful life (years) | 15 years |  |  |  |
Noncompete Agreements | NextGen Global Resources LLC |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Intangible assets acquired | $ 500,000 |  |  |  |
Acquired finite-lived intangible assets, weighted average useful life (years) | 5 years |  |  |  |
Noncompete Agreements | Global Technology Associates, LLC |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Intangible assets acquired | $ 1,200,000 |  |  |  |
Acquired finite-lived intangible assets, weighted average useful life (years) | 5 years |  |  |  |

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- Definition Percentage of voting equity interests acquired at the acquisition date in the business combination. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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 Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=116859721&loc=d3e6613-128477 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=116859721&loc=d3e6578-128477 + Details
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- Definition Amount of increase (decrease) from adjustments after acquisition date under purchase accounting of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=116868678&loc=d3e961-128460 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267 + Details
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