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Acquisitions - Narrative (Details) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 28, 2020 USD ($) | Mar. 29, 2020 USD ($) | Sep. 29, 2019 USD ($) employee | Jun. 30, 2019 USD ($) | Mar. 31, 2019 USD ($) | Jun. 28, 2020 USD ($) | Jun. 30, 2019 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |
Aggregate maximum of contingent consideration | $ 65,900 |  |  |  |  | $ 65,900 |
Reduction in contingent earn-out liabilities |  |  |  |  |  | 1,500 |
Contingent consideration – fair value adjustments | (50) |  |  | $ 0 |  | 1,521 | $ (28)
Contingent earn-out liability | $ 41,100 |  |  |  |  | $ 41,100 |
Minimum |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Significant unobservable input, earn-out period |  |  |  |  |  | 2 years |
Minimum | Existing customer contracts |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Useful life of intangible assets |  |  |  |  |  | 1 year |
Minimum | Trade names |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Useful life of intangible assets |  |  |  |  |  | 3 years |
Maximum |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Significant unobservable input, earn-out period |  |  |  |  |  | 3 years |
Maximum | Existing customer contracts |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Useful life of intangible assets |  |  |  |  |  | 10 years |
Maximum | Trade names |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Useful life of intangible assets |  |  |  |  |  | 5 years |
Segue Technologies, Inc. |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Fair value of acquisition purchase price |  | $ 40,800 |  |  |  |  |
Initial cash payments |  | 30,000 |  |  |  |  |
Receivables related to estimated post-closing adjustments |  | 500 |  |  |  |  |
Estimated fair value of contingent earn-out obligation |  | 11,300 |  |  |  |  |
Aggregate maximum of contingent consideration |  | $ 20,000 |  |  |  |  |
Contingent consideration achievement period |  | 3 years |  |  |  |  |
eGlobalTech |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Fair value of acquisition purchase price |  |  |  |  | $ 49,100 |  |
Estimated fair value of contingent earn-out obligation |  |  |  |  | 21,100 |  |
Aggregate maximum of contingent consideration |  |  |  |  | $ 25,000 |  |
Contingent consideration achievement period |  |  |  |  | 3 years |  |
Issuance of promissory note for business acquisition |  |  |  |  | $ 24,700 |  |
Payables related to estimated post-closing adjustments |  |  |  |  | $ 3,300 |  |
WYG plc |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Fair value of acquisition purchase price |  |  | $ 54,200 |  |  |  |
Issuance of promissory note for business acquisition |  |  | $ 11,500 |  |  |  |
Number of employees | employee |  |  | 1,600 |  |  |  |
Acquisition related costs |  |  | $ 10,400 |  |  |  |

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 23 -URI http://asc.fasb.org/extlink&oid=116868678&loc=d3e1043-128460 + Details
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