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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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