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Acquisitions (Details) $ in Thousands |  |  |  |  | 1 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | ---
Jan. 22, 2018 USD ($) | Oct. 20, 2017 USD ($) | Jan. 09, 2017 USD ($) | Nov. 01, 2016 USD ($) | Apr. 30, 2019 USD ($) | Sep. 30, 2019 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) | Dec. 31, 2019 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Change in fair value of contingent consideration |  |  |  |  |  | $ 1,190 | $ 1,377 | [1] | $ (4,364) | [1] |
Accelerated Concepts |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Cash paid at closing | $ 16,400 |  |  |  |  |  |  |  |  |  |
Cash acquired | $ 200 |  |  |  |  |  |  |  |  |  |
Earn-out payment installment period | 2 |  |  |  |  |  |  |  |  |  |
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual |  |  |  |  |  |  | 22,200 |  |  |  |
Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual |  |  |  |  |  |  | 2,800 |  |  |  |
Acquisition costs |  |  |  |  |  |  | 300 |  |  |  |
TempAlert |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Cash paid at closing |  | $ 40,700 |  |  |  |  |  |  |  |  |
Cash acquired |  | $ 600 |  |  |  |  |  |  |  |  |
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual |  |  |  |  |  |  | 17,000 |  |  |  |
Acquisition costs |  |  |  |  |  | 1,100 | $ 1,400 |  | 400 |  |
SMART Temps |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Cash paid at closing |  |  | $ 28,800 |  |  |  |  |  |  |  |
Cash acquired |  |  | 500 |  |  |  |  |  |  |  |
FreshTemp |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Cash paid at closing |  |  |  | $ 1,700 |  |  |  |  |  |  |
Earn-out payment maximum |  |  |  | $ 2,300 |  |  |  |  |  |  |
Earn-out payments | Accelerated Concepts |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Earn-out payment maximum | $ 6,500 |  |  |  |  |  |  |  |  |  |
Change in fair value of contingent consideration |  |  |  |  | $ 3,500 |  |  |  |  |  |
Business Combination, Contingent Consideration, Liability |  |  |  |  |  | 2,500 |  |  |  |  |
Earn-out payments | TempAlert |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Business Combination, Contingent Consideration, Liability |  |  |  |  |  | 0 |  |  |  |  |
Earn-out payments | SMART Temps |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Earn-out payment maximum |  |  | $ 7,200 |  |  |  |  |  |  |  |
Business Combination, Contingent Consideration, Liability |  |  |  |  |  |  |  |  | $ 0 |  |
Contingent Consideration | Accelerated Concepts |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Change in fair value of contingent consideration |  |  |  |  |  | 3,500 |  |  |  |  |
Contingent Consideration | FreshTemp |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Change in fair value of contingent consideration |  |  |  |  |  | $ 200 |  |  |  |  |
Forecast | Earn-out payments | TempAlert |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Earn-out payment maximum |  |  |  |  |  |  |  |  |  |  | $ 45,000
[1] | Prior period information has been restated for the adoption of ASU No. 2014-09, “Revenue from Contracts with Customers (Topic 606)”, which we adopted on October 1, 2018.

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