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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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