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Acquisition (Assets Acquired and Liabilities Assumed) (Details) - USD ($) $ in Thousands | Jan. 09, 2017 | Nov. 01, 2016 | Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2015
--- | --- | --- | --- | --- | ---
Business Acquisition [Line Items] |  |  |  |  |
Goodwill |  |  | $ 131,995 | $ 109,448 | $ 100,183
SMART Temps |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Cash | $ 28,754 |  |  |  |
Fair value of contingent consideration on acquired business | 10 |  |  |  |
Working capital adjustment | 124 |  |  |  |
Total purchase price consideration | 28,888 |  |  |  |
Fair value of net tangible assets acquired | 761 |  |  |  |
Goodwill | 18,816 |  |  |  |
Total assets acquired and liabilities assumed | 28,888 |  |  |  |
FreshTemp |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Cash |  | $ 1,697 |  |  |
Purchase price payable upon completion of diligence matters |  | 303 |  |  |
Fair value of contingent consideration on acquired business |  | 1,300 |  |  |
Working capital adjustment |  | (37) |  |  |
Total purchase price consideration |  | 3,263 |  |  |
Fair value of net tangible assets acquired |  | (37) |  |  |
Goodwill |  | 2,650 |  |  |
Total assets acquired and liabilities assumed |  | 3,263 |  |  |
Purchased and Core Technology | SMART Temps |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Fair value of identifiable intangible assets acquired | 4,000 |  |  |  |
Purchased and Core Technology | FreshTemp |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Fair value of identifiable intangible assets acquired |  | 400 |  |  |
Customer Relationships | SMART Temps |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Fair value of identifiable intangible assets acquired | 4,000 |  |  |  |
Customer Relationships | FreshTemp |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Fair value of identifiable intangible assets acquired |  | $ 250 |  |  |
Trademarks and Trade Names | SMART Temps |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Fair value of identifiable intangible assets acquired | 711 |  |  |  |
Noncompete Agreements | SMART Temps |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Fair value of identifiable intangible assets acquired | $ 600 |  |  |  |

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