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- Changes in Carrying Amount of Goodwill (Details) - USD ($) $ in Thousands | 9 Months Ended |
--- | --- | ---
Sep. 25, 2015 | Dec. 26, 2014
Goodwill [Line Items] |  |
Goodwill before impairment | $ 288,065 | $ 288,065
Accumulated impairment loss | (46,210) | (46,210)
Goodwill, net | 241,855 | 241,855
Allocated goodwill | 0 |
Staffing Services |  |
Goodwill [Line Items] |  |
Goodwill before impairment | 171,179 | 128,449
Accumulated impairment loss | (46,210) | (46,210)
Goodwill, net | 124,969 | 82,239
Allocated goodwill | 42,730 |
Managed Services |  |
Goodwill [Line Items] |  |
Goodwill before impairment | 116,886 | 0
Accumulated impairment loss | 0 | 0
Goodwill, net | 116,886 | 0
Allocated goodwill | 116,886 |
Unallocated Goodwill |  |
Goodwill [Line Items] |  |
Goodwill before impairment | 0 | 159,616
Accumulated impairment loss | 0 | 0
Goodwill, net | 0 | $ 159,616
Allocated goodwill | $ (159,616) |

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