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GOODWILL AND INTANGIBLE ASSETS - Narrative (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 27, 2013 | Dec. 28, 2012 | Dec. 30, 2011
Intangible Assets [Line Items] |  |  |  |
Goodwill acquired year to date | $ 34.1 | [1] |  |
Amortization of intangible assets | 4.9 |  | 3.1 | 2.9
Trade name/trademarks |  |  |  |
Intangible Assets [Line Items] |  |  |  |
Indefinite-lived trade name/trademarks | 5.7 |  | 5.7 |
MDT Personnel, LLC |  |  |  |
Intangible Assets [Line Items] |  |  |  |
Goodwill acquired year to date | 25.7 |  |  |
Crowley Transportation Services, LLC |  |  |  |
Intangible Assets [Line Items] |  |  |  |
Goodwill acquired year to date | 0.8 |  |  |
The Work Connection, Inc. |  |  |  |
Intangible Assets [Line Items] |  |  |  |
Goodwill acquired year to date | $ 7.6 |  |  |
[1] | Goodwill acquired includes $25.7 million, $0.8 million, and $7.6 million due to the acquisitions of MDT, CTS, and TWC, respectively.

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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13816-109267 + Details
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- Definition Amount of assets, excluding financial assets and goodwill, lacking physical substance and having a projected indefinite period of benefit. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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