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Acquisition (Details) - USD ($)				3 Months Ended		6 Months Ended
	Jan. 09, 2017	Nov. 01, 2016	Oct. 05, 2015	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2017	Mar. 31, 2016	Sep. 30, 2016	Sep. 30, 2015
Business Acquisition [Line Items]
Goodwill				$ 129,921,000	$ 110,707,000	$ 129,921,000	$ 110,707,000	$ 109,448,000	$ 100,183,000
Net income (loss)				1,331,000	$ 2,137,000	3,688,000	$ 8,587,000
SMART Temps
Business Acquisition [Line Items]
Cash paid at closing	$ 28,754,000
Cash acquired	500,000
Goodwill	$ 18,556,000
Weighted average use life of acquired intangibles	10 years 6 months 14 days
Revenues						1,300,000
Net income (loss)						(400,000)
Acquisition costs						800,000
FreshTemp
Business Acquisition [Line Items]
Cash paid at closing		$ 1,697,000
Earn-out payment maximum		2,300,000
Goodwill		$ 2,650,000
Weighted average use life of acquired intangibles		5 years 9 months 18 days
Revenues				200,000		200,000
Acquisition costs						50,000
Bluenica Corporation
Business Acquisition [Line Items]
Cash paid at closing			$ 2,900,000
Earn-out payment maximum			$ 11,600,000
Earn-out payment installment period			4 years
Goodwill			$ 11,000,000
Purchased and Core Technology | SMART Temps
Business Acquisition [Line Items]
Estimated useful life of finite lived intangibles	10 years
Purchased and Core Technology | FreshTemp
Business Acquisition [Line Items]
Estimated useful life of finite lived intangibles		5 years
Customer Relationships | SMART Temps
Business Acquisition [Line Items]
Estimated useful life of finite lived intangibles	12 years
Customer Relationships | FreshTemp
Business Acquisition [Line Items]
Estimated useful life of finite lived intangibles		7 years
Trademarks and Trade Names | SMART Temps
Business Acquisition [Line Items]
Estimated useful life of finite lived intangibles	10 years
Noncompete Agreements | SMART Temps
Business Acquisition [Line Items]
Estimated useful life of finite lived intangibles	5 years
Earn-out payments | SMART Temps
Business Acquisition [Line Items]
Earn-out payment maximum	$ 7,200,000
Additional earn-out payment | Bluenica Corporation
Business Acquisition [Line Items]
Earn-out payment maximum			3,500,000
Fair Value, Measurements, Recurring | Contingent Consideration | Estimate of Fair Value Measurement
Business Acquisition [Line Items]
Contingent consideration fair value				10,068,000		10,068,000		$ 9,960,000
Fair Value, Measurements, Recurring | Contingent Consideration | Estimate of Fair Value Measurement | SMART Temps
Business Acquisition [Line Items]
Contingent consideration fair value	$ 10,000			10,000		10,000
Fair Value, Measurements, Recurring | Contingent Consideration | Estimate of Fair Value Measurement | FreshTemp
Business Acquisition [Line Items]
Contingent consideration fair value		$ 1,300,000		1,463,000		1,463,000
Fair Value, Measurements, Recurring | Contingent Consideration | Estimate of Fair Value Measurement | Bluenica Corporation
Business Acquisition [Line Items]
Contingent consideration fair value			$ 10,400,000	$ 8,595,000		$ 8,595,000

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The cash inflow associated with the acquisition of business during the period (for example, cash that was held by the acquired business).

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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